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Chapter: 3 -Problem: 23 >> Describe the distinction between elastic and inelastic collisions. Give an example of each.
Answer Preview: In an elastic collision the total kinetic energy of the colliding objec…

, Chapter: 9 -Problem: 13 >> Describe how you could use two large, circular Polaroid filters in front of a circular window as a kind of window shade.
Answer Preview: as um that here is the object And here is the pinhole camera So what happens here is Gary …

, Chapter: 1 -Problem: 14 >> A long-distance runner has an average speed of 4 m/s during a race. How far does the runner travel in 20 min?
Answer Preview: How far does a longdista…

, Chapter: 3 -Problem: 29 >> A bicycle and rider going 10 m/s approach a hill. Their total mass is 80 kg. (a) What is their kinetic energy? (b) If the rider coasts up the hill without pedaling, how high above its starting level will the bicycle be when it finally rolls to a stop?
Answer Preview: Given Mass of bicycle and the rider m 80 kg Velocity of bicycle v 10 ms a Therefore Kin…

, Chapter: 3 -Problem: 29 >> A person runs up several flights of stairs and is exhausted at the top. Later, the same person walks up the same stairs and does not feel as tired. Why is this? Ignoring air resistance, does it take more work or energy to run up the stairs than to walk up?
Answer Preview: It takes essentially the same amount of …

, Chapter: 8 -Problem: 3 >> Compute the wavelength of the carrier wave of your favorite radio station.
Answer Preview: we can calculate the wavelength of the carrier wave of my …

, Chapter: 1 -Problem: 11 >> Can the resultant of two velocities have zero magnitude? If so, give an example.
Answer Preview: The resultant velocity of two velocities has zero mag…

, Chapter: 7 -Problem: 1 >> Compute the electric force acting between the electron and the proton in a hydrogen atom. The radius of the smallest orbit of the electron around the proton is about 5.3 3 10-11 m.
Answer Preview: From coulomb inverse square low the electrostatic force between two electr…

, Chapter: 1 -Problem: 32 >> A bungee jumper falls for 1.3 s before the bungee cord begins to stretch. Until the jumper has bounced back up to this height, the elastic cord causes the jumper to have an average acceleration upward of 4 m/s2. (a) How fast is the jumper going when the bungee cord begins to stretch? (b) How far below the diving platform is the jumper at that moment? (c) How long after the bungee cord begins to st
Answer Preview: a To determine the speed of the jumper when the bungee cord begins to stretch we need to use the equation of motion v u at where v final velocity unkn…

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, Chapter: 6 -Problem: 15 >> A person riding on a bus hears the sound from a horn on a car that is stopped. What is different about the sound when the bus is approaching the car compared to when the bus is moving away from the car?
Answer Preview: The concept behind this is Doplers effect in Sound When the …

, Chapter: 2 -Problem: 17 >> Describe the variation of the net force on and the acceleration of a mass on a spring as it executes simple harmonic motion.
Answer Preview: When a mass is attached to a spring and undergoes simple harmonic motion the net force acting on the …

, Chapter: 10 -Problem: 19 >> Characteristic x-rays emitted by molybdenum have a wavelength of 0.072 nm. What is the energy of one of these x-ray photons?
Answer Preview: For characteristic x rays the energy is related by wavelength as E hc Here we are given …

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, Chapter: 5 -Problem: 34 >> What effect does heating the air in a room have on the relative humidity?
Answer Preview: If no water vapor is added to t…

, Chapter: 9 -Problem: 29 >> After hitting a ball into a water trap, a golfer looks into the pond and spies the ball within apparent easy reach. Reaching in to retrieve the ball, the golfer is surprised to find that it cannot be grasped even with a fully extended arm. Explain why the golfer was deceived into thinking that the location of the ball was close at hand.
Answer Preview: Diffraction is caused by one wave of light being shift…

, Chapter: 4 -Problem: 21 >> An ebony log with volume 12 ft3 is submerged in water. What is the buoyant force on it?
Answer Preview: Answer As we know that The magnitude of bayount force is equal …

, Chapter: 4 -Problem: 7 >> Scuba divers take their own supply of air with them when they go underwater. Why couldn’t they just take a long hose with them from the surface and breathe through it
Answer Preview: Scuba divers cannot just take a long hose with them from the surface and breathe through it for seve…

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, Chapter: 3 -Problem: 1 >> A sprinter with a mass of 65 kg reaches a speed of 10 m/s during a race. Find the sprinter’s linear momentum.
Answer Preview: let m be the mass of sprinter and …

, Chapter: 2 -Problem: 9 >> A woman is riding on a train while watching the display on her GPS unit. She notices that both the “speed” and the “direction” readings are not changing. What can the she conclude about the net force acting on the train car?
Answer Preview: Constant speed and heading toget…

, Chapter: 9 -Problem: 48 >> Describe the phenomenon of dispersion, and explain how it leads to the production of a spectrum.
Answer Preview: DISPERSION OF LIGHT the phenomenon of splitting up …

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, Chapter: 5 -Problem: 33 >> What is saturation density? How does it change when the temperature increases?
Answer Preview: The saturation density is the highest possible humidit…

, Chapter: 9 -Problem: 21 >> What is different about an image (of a nearby object) formed with a convex mirror compared to an image formed with a concave mirror? What are the advantages of each type of mirror?
Answer Preview: The difference about an image of a nearby object formed with a c…

, Chapter: 1 -Problem: 2 >> Express your height in(a) Meters (b) Centimeters.
Answer Preview: Two examples of height expr…

, Chapter: 2 -Problem: 11 >> A person stands on a scale inside an elevator at rest (Figure 2.54). The scale reads 800 N.(a) What is the person?s mass?(b) The elevator accelerates upward momentarily at the rate of 2 m/s2. What does the scale read then?(c) The elevator then moves with a steady speed of 5 m/s. What does the scale read now? Transcribed I
Answer Preview: Weighing machine measures normal reaction force of the body a When elevator is at re…

, Chapter: 4 -Problem: 8 >> A motorist driving through Colorado checks the tire pressure in Denver (elevation 5,000 ft) and then again at the Eisenhower Tunnel (elevation 11,000 ft). Would the pressures be the same? What two main factors affect the tire pressure as the car climbs?
Answer Preview: The two factors are the decrease in air pressure and the decrease in air temperature at higher a…

, Chapter: 11 -Problem: 1 >> Determine the nuclear composition (number of protons and neutrons) of the following isotopes. (a) carbon-14 (b) calcium-45 (c) silver-108 (d) radon-225 (e) plutonium-242
Answer Preview: Solution a Carbon 14 Mass number A of an element Number of Protons number of neutrons The mass numbe…

, Chapter: 1 -Problem: 1 >> Most cars can decrease their speed much more rapidly than they can increase it. What factors contribute to cause this?
Answer Preview: A car accelerates and decelerates because of the force of fri…

, Chapter: 6 -Problem: 23 >> The sound level measured in a room by a person watching a movie on a home theater system varies from 65 dB during a quiet part to 95 dB during a loud part. Approximately how many times louder is the latter sound?
Answer Preview: Sound varies from 95 and 65 db Hence 956530dB For …

, Chapter: 4 -Problem: 10 >> The same bicycle tire pump is used to inflate a mountain bike tire to 40 psi and then a road bike tire to 100 psi. What difference would the user notice when using the pump on the two tires?
Answer Preview: You would have to pus…

, Chapter: 9 -Problem: 12 >> What is polarized light? How do Polaroid sunglasses exploit polarization?
Answer Preview: Light is an electromagnetic wave This means that light consist of electric and magnetic waves oscill…

, Chapter: 1 -Problem: 3 >> A convenient time unit for short time intervals is the millisecond. Express 0.0452 s in milliseconds.
Answer Preview: In this question we have to convert time in second …

, Chapter: 2 -Problem: 25 >> Describe how the magnitude of the gravitational force between objects was first measured.
Answer Preview: Cavendish balanced two masses on a rod suspended by a thin …

, Chapter: 6 -Problem: 36 >> Normal telephones do not transmit pure tones with frequencies below about 300 Hz. But a person whose speaking voice has a frequency of 100 Hz can be heard and understood over the phone. Why is that?
Answer Preview: Spoken syllables are mostly complex tones, which i…

, Chapter: 10 -Problem: 15 >> An atom of neutral zinc possesses 30 electrons. In its ground configuration, how many fundamental energy levels are required to accommodate this number of electrons? That is, what is the smallest value of n needed so that all 30 of zinc’s electrons occupy the lowest possible quantum energy states consistent with the Pauli exclusion principle?
Answer Preview: Electrons in neutral Zinc 30 The number of electrons that can …

, Chapter: 7 -Problem: 3 >> Compute the number of electrons that flow through a wire each second when the current in the wire is 0.2 A.
Answer Preview: Solution Electric current is the rate of flow of electric charge Wher…

, Chapter: 3 -Problem: 26 >> Is it possible for one object to gain mechanical energy from another without touching it? Explain.
Answer Preview: Yes A spacecraft can gain energy from a close pass …

, Chapter: 5 -Problem: 43 >> Is our society truly facing an “energy crisis,” assuming by this term we mean that we are running out of energy? What is happening to our energy resources as a result of the increasing industrialization of the world?
Answer Preview: According to the law of conservation of energy, th…

, Chapter: 11 -Problem: 15 >> An accident in a laboratory results in a room being contaminated by a radioisotope with a half-life of 3 days. If the radiation is measured to be eight times the maximum permissible level, how much time must elapse before the room is safe to enter?
Answer Preview: Let the no of h…

, Chapter: 4 -Problem: 25 >> A box-shaped piece of concrete measures 3 ft by 2 ft by 0.5 ft. (a) What is its weight? (b) Find the buoyant force that acts on it when it is submerged in water. (c) What is the net force on the concrete piece when it is underwater?
Answer Preview: Given Dimensions of the concrete box 3ft2ft05ft So if we convert these dimensions into international …

, Chapter: 3 -Problem: 30 >> In January 2003, an 18-year-old student gained a bit of fame for surviving—with only minor injuries—a remarkable traffic accident. The vehicle he was driving was “clipped” by another one, left the road, and rolled several times. He was thrown upward from the vehicle (he wasn’t wearing a seat belt) and ended up dangling from an overhead telephone cable and a ground wire about 8 meters above the gro
Answer Preview: To solve this problem we can use the principles of conservation of energy and the laws of motion We will assume that the initial speed of the driver i…

, Chapter: 6 -Problem: 34 >> A sound is produced by combining three pure tones with frequencies of 200 Hz, 400 Hz, and 600 Hz. A second sound is produced using 200 Hz, 413 Hz, and 600 Hz pure tones. What important difference is there between the two sounds?
Answer Preview: The sound with the 200-, 400-, and 600-…

, Chapter: 10 -Problem: 7 >> Describe the photoelectric effect. Name some devices that make use of this process.
Answer Preview: The photoelectric effect refers to what happens when electrons are emitted from a material that has …

, Chapter: 10 -Problem: 21 >> A high-energy photon can collide with a free electron and give it some energy. (This is called the Compton effect.) How are the photon’s energy, frequency, and wavelength affected by the collision?
Answer Preview: The photons ener…

, Chapter: 12 -Problem: 17 >> If a galaxy is found to have a recessional speed of 140,000 km/s, about how far away is it? The current estimate of the precision of the Hubble parameter is approximately 65%. Determine the range within which the true distance to the galaxy lies.
Answer Preview: It gets narrower This is true for single slits double slits and diffraction gratings The smaller th…

, Chapter: 6 -Problem: 33 >> A 100-Hz pure tone at a 70-dB sound level and a 1,000-Hz pure tone at the same sound level are heard separately. Do they sound equally loud? If not, which is louder, and why?
Answer Preview: The 1,000 -Hz tone …

, Chapter: 9 -Problem: 17 >> An observer O stands in front of a plane mirror as shown in. Which of the numbered locations 1 through 5 best represents the location of the image of the source S seen by the observer? Justify your choice by appealing to the appropriate law(s) of optics. Transcribed Image Text: 2 1 4 5 S 3
Answer Preview: The effects of diffraction can be regularly seen in everyd…

, Chapter: 1 -Problem: 22 >> In Figure 1.19, arrows show the directions of the velocity and the acceleration of a ball moving in a circle. Make a similar sketch showing these directions for a car Figure 1.19(a) speeding up from a stop sign.(b) slowing down as it approaches a stop sign.
Answer Preview: a Shows the direction of velocity and acce…

, Chapter: 6 -Problem: 5 >> A 4-Hz continuous wave travels on a Slinky. If the wavelength is 0.5 m, what is the speed of waves on the Slinky?
Answer Preview: Given Frequency 40 Hz Wavelength 05 m By …

, Chapter: 3 -Problem: 17 >> If a spring is compressed to half its length, by how much does the amount of energy stored in the spring change?
Answer Preview: The amount of energy stored in a spring is given by the formula E 1 2 kx 2 where E is the energy sto…

, Chapter: 7 -Problem: 24 >> Two 1.5-volt batteries are connected in series in an electric circuit. Use the concept of energy to explain why this combination is equivalent to a single 3-volt battery. When connected in parallel, what are two 1.5-volt batteries equivalent to?
Answer Preview: Each 1 5-volt battery gives each coulomb of charge …

, Chapter: 8 -Problem: 9 >> The filament of a light bulb goes from a temperature of about 300 K up to about 3,000 K when it is turned on. How many times more radiant energy does it emit when it is on than when it is off?
Answer Preview: The intensity of emited energy is given by the Stefan Boltzman …

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, Chapter: 12 -Problem: 19 >> A compact neutron star has a mass of 2.8 x 1030 kg (about 1.4 times the mass of the Sun) but a radius of only 104 m (approximately 6.2 mi!). If a clock on the surface of this exotic star marks the passage of 1 h of time, how much time is observed to pass on an identical clock located a very large distance from the neutron star?
Answer Preview: The time observed on the clock located a large dist…

, Chapter: 7 -Problem: 14 >> Materials can be classified into four categories based on the ease with which charges can flow through them. Give the names of these categories and describe each one.
Answer Preview: There are conductors, in which charge can flow readily; su…

, Chapter: 9 -Problem: 42 >> A convex lens forms a clear, focused image of some small, fixed object on a screen. If the screen is moved closer to the lens, will the lens have to be(a) moved closer to the object,(b) moved farther from the object,(c) left at the same location to produce a clear image on the screen at its new location? Explain your answer.
Answer Preview: Lens have to move farther …

, Chapter: 4 -Problem: 29 >> A scale reads 100 N when a piece of aluminum is hanging from it. What does it read when it is lowered so that the aluminum is submerged in water?
Answer Preview: when aluminium is submerged in water it feels a buoyanc…

, Chapter: 2 -Problem: 33 >> Six identical cars are towing identical trailers at constant, albeit different, speeds along level roads in the desert. The trailers carry different loads, so their masses vary. The circumstances of each vehicle are shown here. Using the letter identifiers, rank the difference between the magnitude of the force exerted by the car on the trailer and the magnitude of the force exerted by the trailer
Answer Preview: To determine the ranking of the difference between the magnitude of the force exerted …

, Chapter: 5 -Problem: 2 >> On a nice winter day at the South Pole, the temperature rises to 260° F. What is the approximate temperature in degrees Celsius?
Answer Preview: To convert a temperature from Fahrenheit (F) to Celsius (C), you …

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, Chapter: 1 -Problem: 15 >> As a stop light changes from red to green, a car starts to cross through the intersection. An instant before it begins to move, its velocity is zero. Must its acceleration at that time also be zero. Why or why not? Explain.
Answer Preview: If the velocity of the car is …

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, Chapter: 3 -Problem: 14 >> Describe the motion of an object that possesses kinetic energy yet undergoes no net displacement.
Answer Preview: If an object possesses kinetic energy but undergoes no net displacement it means that it is movi…

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, Chapter: 9 -Problem: 1 >> Suppose a beam of red light from an He-Ne laser (? = 633 nm) strikes a screen containing two narrow slits separated by 0.200 mm. The fringe pattern is projected on a white screen located 1.00 m away. Find the distance in millimeters between adjacent bright areas near the center of the interference pattern that is produced.
Answer Preview: Given 633mm Distance b w two narrow slits d 0 200 mm …

, Chapter: 3 -Problem: 21 >> An archer using a simple bow exerts a force of 180 N to draw back the bow string 0.50 m. (a) What is the average work done by the archer in preparing to launch her arrow? (Compute the average work as you would any average quantity: average work 5 12 [final work – initial work].) (b) If all the work is converted into the kinetic energy of the arrow upon its release, what is the arrow’s speed as it
Answer Preview: Given F180N l05m m0021kg a Work DoneForce Displacement Work DoneFl Work Done1800590J Therefore the …

, Chapter: 3 -Problem: 9 >> A series of five 0.1-kg spheres are arrayed along a thin, lightweight rigid rod with length 0.5 m at intervals of 0.1 m from one end of the rod. The system spins about an axis perpendicular to and passing through the unoccupied end of the rod with a period of 0.3 s. In this way, each mass moves in the same plane along a circular path whose radius is its distance from the rotation axis. (a) How far
Answer Preview: a In one revolution the distance traveled by any one sphere is the circumference C of a circle tha…

, Chapter: 8 -Problem: 8 >> In many cases, the effect of an electromagnetic interaction is perpendicular to its cause. Describe two different examples that illustrate this.
Answer Preview: The magnetic field lines around a current-carrying wire are circles. …

, Chapter: 9 -Problem: 2 >> Distinguish between specular reflection and diffuse reflection.
Answer Preview: Answer Specular reflection implies that angle between the reflected beam and the norm…

, Chapter: 1 -Problem: 27 >> A skydiver jumps out of a helicopter and falls freely for 3 s before opening the parachute. (a) What is the skydiver’s downward velocity when the parachute opens? (b) How far below the helicopter is the skydiver when the parachute opens?
Answer Preview: a981 ms2 t 3 s u0 ms v downward velocity when the parachute opens s distan…

, Chapter: 2 -Problem: 27 >> If suddenly the value of G, the gravitational constant, increased to a billion times its actual value, give several examples of the kinds of things that would happen.
Answer Preview: The weight of everything on Earth would increase a billion times so …

, Chapter: 5 -Problem: 4 >> A copper vat is 10 m long at room temperature (20oC). How much longer is it when it contains boiling water at 1 atm pressure?
Answer Preview: To calculate the change in length of the copper vat when it contains boiling water at 1 …

, Chapter: 11 -Problem: 5 >> The isotope polonium-210 undergoes alpha decay. Write the reaction equation and determine the identity of the daughter nucleus.
Answer Preview: The wavelength of light waves 10 m is very small as compared to the size of the obstacle around us l…

, Chapter: 6 -Problem: 25 >> What are the frequencies of the first four harmonics of middle C (261.6 Hz)?
Answer Preview: Solution F1 is called fundamental or First h…

, Chapter: 4 -Problem: 3 >> What would be the mass density, weight density, and specific gravity of aluminum on the Moon? The acceleration of gravity there is 1.6 m/s2.
Answer Preview: To calculate the mass density weight density and specific gravity of aluminum on the Moon we need to …

, Chapter: 8 -Problem: 9 >> To test whether a material is a superconductor, a scientist decides to make a ring out of the material and then to see whether a current will flow around in the ring with no steady energy input.(a) Explain how a magnet could be used to initiate the current.(b) At some later time, how could the scientist check to see whether the current is still flowing in the ring without touching the ring?
Answer Preview: (a) Place a magnet inside the coil, lower its temperature below it…

, Chapter: 9 -Problem: 46 >> How is the eye able to form focused images of objects that are different distances away?
Answer Preview: In human eye there is convex lens and it has abi…

, Chapter: 10 -Problem: 15 >> A mixture of hydrogen and neon is heated until it is luminous. Describe what is seen when this light passes through a prism and is projected onto a screen.
Answer Preview: The emission spectra of both neon and hydro…

, Chapter: 1 -Problem: 11 >> In Figure 1.13, assume that v1 = 8 m/s and v2 = 6 m/s. Use a ruler to estimate the magnitudes of the resultant velocities in (c) and (d). Transcribed Image Text: U2 wind (a) 22 resultant velocity 2? 2? wind (b) 22 (d) V2 resultant velocity
Answer Preview: STEP 01 The quantity of velocity is known as a vector The resultant velocity v is calculated with th…

, Chapter: 7 -Problem: 4 >> Using your understanding of the nature of internal energy and temperature, explain why we might expect the resistance of a solid to increase if its temperature increases.
Answer Preview: Resistance is due to the collisions of electrons with atoms …

, Chapter: 11 -Problem: 7 >> The isotope silver-107* undergoes gamma decay. Write the reaction equation, and determine the identity of the daughter nucleus.
Answer Preview: Many nuclei are radioactive that is they decompose by emitting particles and in doing so become a di…

, Chapter: 1 -Problem: 21 >> A runner is going 10 m/s around a curved section of track that has a radius of 35 m. What is the runner’s acceleration?
Answer Preview: Let v be the velocity of runner and r be the …

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, Chapter: 7 -Problem: 31 >> If AC in a circuit can be thought of as a wave, which kind is it, longitudinal or transverse?
Answer Preview: Because the charges in a wir…

, Chapter: 9 -Problem: 23 >> What kind of mirror (concave, convex, or plane) do you think dental care workers use to examine patients’ teeth and gums for disease? Explain your choice.
Answer Preview: dental care workers use concave mirrors Because in a concave mirror we can …

, Chapter: 4 -Problem: 13 >> The volume of the Drop Tower “Bremen” (a 100-meter-tall tube used to study processes during free fall) is 1,700 m3. (a) What is the mass of the air that must be removed from it to reduce the pressure inside to nearly zero (1 Pa compared to 100,000 Pa)? (b) What is the weight of the air in pounds?
Answer Preview: Air contains about 21 percent oxygen and most fires require at leas…

, Chapter: 2 -Problem: 29 >> In the broadest terms, what causes tides?
Answer Preview: Tides are caused by the gravitational pull of the Moon on the Earth and its oc…

, Chapter: 7 -Problem: 6 >> When clothes are removed from a hot dryer, they often cling together, but when two identical articles of clothing, such as two matched socks, are taken out, they usually repel one another. Explain this difference in behavior.
Answer Preview: During the drying process, articles of clothing build …

, Chapter: 11 -Problem: 13 >> A Geiger counter registers a count rate of 4,000 counts per minute from a sample of a radioisotope. Twelve minutes later, the count rate is 1,000 counts per minute. What is the half-life of the radioisotope?
Answer Preview: 1000 4000 0 25 this is th…

, Chapter: 5 -Problem: 17 >> A 10-kg lead brick is dropped from the top of a 629-m-tall television transmitting tower in North Dakota and falls to the ground. Assuming all of its energy goes to heat it, what is its temperature increase?
Answer Preview: Given Mass m of lead brick 10kg Height from which it is dropped 629m g 98ms 2 Specific heat …

, Chapter: 5 -Problem: 8 >> Which metal in the bimetallic strip has the larger coefficient of linear expansion: the metal on the outer side of the spiral or the metal on the inner side? How can you determine this?
Answer Preview: From the photo you can see that the thermometer pointer …

, Chapter: 7 -Problem: 34 >> A simple circuit of the form shown in Figure 7.37 is constructed using a battery and three lightbulbs. The bulbs may have different resistances as given in the six circumstances A through F. For each situation, however, the battery in the circuit is always the same, as are the wire connections. Rank these circuits from greatest to smallest, according to the voltage across the bulb shown in red in
Answer Preview: To rank these circuits based on the voltage across the red bulb, we need to consider the concept of …

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, Chapter: 4 -Problem: 1 >> A grain silo is filled with 2 million pounds of wheat. The area of the silo’s floor is 400 ft2. Find the pressure on the floor in pounds per square foot and in psi.
Answer Preview: In grain Silo Weight of Wheat Force acting F F 2 million Pounds F …

, Chapter: 5 -Problem: 22 >> A submerged heater is used in an aquarium to keep the water above room temperature. Should it be placed near the surface of the water or near the bottom to be most effective? Explain.
Answer Preview: To achieve the most effective heating in an aquarium it is generally recommended to place the submerged heater near the bottom of the water rather tha…

, Chapter: 5 -Problem: 2 >> Pyrex glassware is noted for its ability to withstand sudden temperature changes without breaking. Explain how its coefficient of linear expansion contributes to this ability.
Answer Preview: One reason why things break during a sudden temperature change …

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, Chapter: 4 -Problem: 16 >> The way pressure increases with depth in a gas is different from the way it does in a liquid. Why?
Answer Preview: Gases are compressible so that their densi…

, Chapter: 7 -Problem: 27 >> What is the purpose of having fuses or circuit breakers in electric circuits? How should they be connected in circuits so they will be effective?
Answer Preview: A fuse or circuit breaker is designed to stop an e…

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, Chapter: 2 -Problem: 5 >> The mass of a subway car and passengers is 40,000 kg. If its acceleration as it leaves a station is 0.9 m/s2, what is the net force acting on it?
Answer Preview: Let m be the mass of subway car and pas…

, Chapter: 4 -Problem: 5 >> Why can gases be compressed so much more readily than solids or liquids?
Answer Preview: There are several reasons that make gases more compr…

, Chapter: 6 -Problem: 30 >> An audio speaker producing a steady sound at an outdoor concert is 25 ft away from you. If you move to a position where the speaker is 75 ft distant, by what factor will the amplitude of the sound change?
Answer Preview: Mathematically, it can be expressed as: Intensity 1 …

, Chapter: 9 -Problem: 53 >> Would a prism made of diamond be better at dispersing light than one made of glass? Why or why not?
Answer Preview: A prism made of diamond would because a diamond …

, Chapter: 2 -Problem: 9 >> The engines in a supertanker carrying crude oil produce a net force of 20,000,000 N on the ship. If the resulting acceleration is 0.1 m/s2, what is the ship’s mass?
Answer Preview: Let m be the mass of the ship and a be the re…

, Chapter: 4 -Problem: 16 >> The depth of the Pacific Ocean in the Mariana Trench is 36,198 ft. What is the gauge pressure at this depth?
Answer Preview: At a depth of 36 198 ft in the Pacific Ocean the gauge pressure would be the press…

, Chapter: 7 -Problem: 2 >> A particular solid is electrically charged after it is rubbed, but it is not known whether its charge is positive or negative. How could you determine which charge it has by using a piece of plastic and fur?
Answer Preview: Rub the plastic with the fur. The plastic …

, Chapter: 11 -Problem: 3 >> The isotope silver-110 undergoes beta decay. Write the reaction equation and determine the identity of the daughter nucleus.
Answer Preview: Beta decay is the type of radioactive decay in which electron or positron is emitted fr…

, Chapter: 3 -Problem: 23 >> A 25-kg child uses a pogo stick to bounce up and down. The spring constant, k, of the toy equals 8750 N/m. (a) By how much would the spring be compressed by the child if she simply balanced herself vertically on the pedals of the stick? (b) How much energy is stored in the spring under this circumstance?
Answer Preview: Hookes Law for springs states that F k x where F is the Force acting on the spring k is …

, Chapter: 5 -Problem: 20 >> Double-paned thermal insulating windows consist of two glass panels separated by a narrow gap from which most of the air has been removed to create a near vacuum in the space between the panes. Explain how this design helps to better insulate a home than a window that is made from a single sheet of glass.
Answer Preview: Double paned thermal insulating windows offer better insulation to a home com…

, Chapter: 8 -Problem: 9 >> Describe what happens to an electric charge as an electromagnetic wave passes through the region around it. Explain why the charge will produce another electromagnetic wave.
Answer Preview: A charged particle will oscillate with the same frequency as th…

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, Chapter: 4 -Problem: 33 >> The wing of an airplane has an average cross-sectional area of 12 m2 and experiences a lift force of 75,000 N. What is the average difference in the air pressure between the top and bottom of the wing?
Answer Preview: SOLUTION The pressure acting on the wing o…

, Chapter: 5 -Problem: 37 >> Explain what a heat engine does and what a heat mover does.
Answer Preview: A heat engine takes in heat at some high temperature converts som…

, Chapter: 6 -Problem: 26 >> What is ultrasound? Give two examples of what it can be used for.
Answer Preview: Ultrasound is any sound wave with a frequency …

, Chapter: 9 -Problem: 31 >> Rank (from smallest to largest) the angle of refraction for a light ray in air entering each of the following substances with an angle of incidence equal to 308: (a) water, (b) benzene, (c) dense flint glass, (d) diamond.
Answer Preview: Li 308 a Water n 1 sin I n 2 si…

, Chapter: 1 -Problem: 29 >> The roller coaster in Figure 1.39 starts at the top of a straight track that is inclined 30? with the horizontal. This causes it to accelerate at a rate of 4.9 m/s2 (1/2 g).(a) What is the roller coaster?s speed after 3 s?(b) How far does it travel during that time? Transcribed Image Text: a = - 30
Answer Preview: It can be achieved by using JavaScript and jQuery Method 1 Using Ja…

, Chapter: 4 -Problem: 19 >> If Earth’s atmosphere warmed up and expanded to a larger total volume but its total mass did not change, would this affect the atmospheric pressure at sea level? Would this affect the pressure at the top of Mount Everest? Explain.
Answer Preview: If Earth s atmosphere warmed up and expanded to a larger total volume while its total mass remained …

, Chapter: 6 -Problem: 16 >> Explain the process of echolocation. How is the Doppler effect sometimes incorporated?
Answer Preview: A wave is sent out, it reflects off an object, and the returning wave is detected. The tim…

, Chapter: 9 -Problem: 33 >> Would the critical angle for a glass–water interface be less than, equal to, or greater than the critical angle for a glass–air interface? Explain your choice.
Answer Preview: For critical angle r 90 Similarl…

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, Chapter: 4 -Problem: 6 >> Suppose you are in the International Space Station in orbit around Earth and a fellow astronaut gives you what appears to be an inflated balloon. Describe how you could determine whether the balloon contains a gas, a liquid, or a solid.
Answer Preview: Squeeze it If the balloon doesn t change shape at all it contains a rigid solid If it …

, Chapter: 7 -Problem: 20 >> Describe Ohm’s law.
Answer Preview: The current in a conductor is equal to the …

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, Chapter: 4 -Problem: 21 >> Explain how a barometer can be used to measure altitude.
Answer Preview: A barometer measures atmospheric pressure which decreases as altitude increases This relationship be…

, Chapter: 6 -Problem: 24 >> Approximately how many times louder is a 100-dB sound than a 60-dB sound?
Answer Preview: For each 10 dB, so…

, Chapter: 3 -Problem: 35 >> How long does it take a worker producing 200 W of power to do 10,000 J of work?
Answer Preview: Give that Power P 200 watt Work W …

, Chapter: 4 -Problem: 8 >> A small statue is recovered in an archaeological dig. Its weight is measured to be 96 lb, and its volume 0.08 ft3. (a) What is the statue’s weight density? (b) What substance is it?
Answer Preview: a To find the weight density of the statue we need to divide the weight of the statue by its volume …

, Chapter: 7 -Problem: 7 >> Imagine a company offering a line of hair dryers that operate on different voltages, say, 12, 30, 60, and 120 V. Assume that all of the dryers are rated at 1,200 W and find the current that would flow in each as it operates. What would be different about the heating filament wires and the motors in the various hair dryers?
Answer Preview: Use P = IV I = P/V For V = 12 V: I = 1200 W/12 …

, Chapter: 3 -Problem: 11 >> A loaded gun is dropped on a frozen lake. The gun fires, with the bullet going horizontally in one direction and the gun sliding on the ice in the other direction. The bullet’s mass is 0.02 kg, and its speed is 300 m/s. If the gun’s mass is 1.2 kg, what is its speed?
Answer Preview: Answers Since the gun is dropped on ice we assume the resistance due to friction to be negligible T…

, Chapter: 4 -Problem: 4 >> If you classify everything around you as an element, a compound, or a mixture, which category do you think would have the largest number of entries? Why?
Answer Preview: Mixtures This is because unlike elements and co…

, Chapter: 7 -Problem: 35 >> Six resistors, all having the same temperatures and compositions, are each attached to a battery with voltage V to form a simple circuit. The resistors have different lengths, l, but the same diameters. Rank the circuits according to the current that flows through the resistor from smallest to greatest. If two (or more) circuits have the same current flowing, give them the same ranking. Explain th
Answer Preview: The current that flows through a resistor in a simple circuit is inversely proportional to its resis…

, Chapter: 1 -Problem: 4 >> One mile is equal to 1,609 m. Express this distance in kilometers and in centimeters.
Answer Preview: Express 1609 m 1 …

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, Chapter: 5 -Problem: 9 >> A certain engine part made of iron expands 1 mm in length as the engine warms up. What would be the approximate change in length if the part were made of aluminum instead of iron?
Answer Preview: The coefficient of thermal expansion of iron is 1 2 10 5 1 C a…

, Chapter: 8 -Problem: 10 >> A rectangular metal plate measures 0.15 m long and 0.1 m wide. The plate is heated to a temperature of 1,200 K by passing a current through it. Assuming that it behaves like a blackbody, how much power does the plate radiate under these conditions?
Answer Preview: The power radiated by a blackbody can be calculated using the Stefan-Boltzmann law, which states tha…

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, Chapter: 11 -Problem: 6 >> The isotope plutonium-239 undergoes alpha decay. Write the reaction equation and determine the identity of the daughter nucleus.
Answer Preview: 239 …

, Chapter: 8 -Problem: 3 >> A solenoid connected to a 60-Hz AC source will produce an oscillating magnetic field, as we have seen. If a permanent magnet is inserted into the solenoid, it will oscillate, but not with the same frequency that an unmagnetized piece of iron would. Why?
Answer Preview: A permanent magnet inserted in a solenoid will vibrate …

, Chapter: 6 -Problem: 3 >> What is the speed of sound in air at the normal boiling temperature of water?
Answer Preview: speed of sound in ai…

, Chapter: 5 -Problem: 32 >> The temperature in the deep interiors of some giant molecular clouds in the Milky Way galaxy is 50 K. Compare the amount of energy that would have to be transferred to this environment to the amount that would have to transferred to a room temperature environment to bring about a 1.0 J/K increase in the entropy of the universe in each case.
Answer Preview: The change in entropy of a system is given by S Q T where S is the change in e…

, Chapter: 7 -Problem: 28 >> A lightbulb is rated at 60 W when connected to 120 V.(a) What current flows through the bulb in this case?(b) What is the bulb’s resistance?(c) What would be the current in the bulb if it were connected to 60 V, assuming the resistance stays the same?(d) What would be its power consumption in this case?
Answer Preview: Let's solve each part of the question step by step: Given information: Rated power (P) = 60 W Rated …

, Chapter: 10 -Problem: 23 >> An electron and a proton are moving with the same speed. Which has the longer de Broglie wavelength?
Answer Preview: Because the protons mass is lar…

, Chapter: 5 -Problem: 15 >> Air is allowed to escape from an inflated tire. Is the temperature of the escaping air higher than, lower than, or equal to the temperature of the air inside the tire? Why?
Answer Preview: The temperature of the air escaping from a tire is lower than the temperature o…

, Chapter: 8 -Problem: 7 >> Name five different basic devices that use at least one of the electromagnetic interactions.
Answer Preview: The following basic devices use at le…

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, Chapter: 5 -Problem: 6 >> The door of a refrigerator is left open. Assuming the refrigerator is in a closed room, will the air in the room eventually be cooled?
Answer Preview: No For each joule of heat removed from air inside the re…

, Chapter: 5 -Problem: 4 >> What happens to the atoms and molecules in a substance as its temperature increases?
Answer Preview: The kinetic energi…

, Chapter: 1 -Problem: 19 >> A child attaches a rubber ball to a string and whirls it around in a circle overhead. If the string is 0.5 m long and the ball’s speed is 10 m/s, what is the ball’s centripetal acceleration?
Answer Preview: r 05 m v 10 ms To compute the bal…

, Chapter: 5 -Problem: 14 >> Aluminum is melted during the recycling process.(a) How much heat must be transferred to each kilogram of aluminum to bring it to its melting point, 660°C, from room temperature, 20°C? (b) About how many cups of coffee could you make with this much energy?
Answer Preview: a To calculate the amount of heat required to melt aluminum we need to know its specific heat and …

, Chapter: 8 -Problem: 7 >> Even though the output voltage of a transformer can be much larger than the input voltage, the power output is nearly the same as the power input. Use this to determine the relationship between the input and output currents and the number of turns in the input and output coils.
Answer Preview: In an ideal transformer with no losses, the power output is indeed nearly the same as the power inpu…

, Chapter: 9 -Problem: 9 >> When viewed through a magnifying glass, a stamp that is 2 cm wide appears upright and 6 cm wide. What is the magnification?
Answer Preview: Hen…

, Chapter: 5 -Problem: 5 >> A machinist wishes to insert a steel rod with a diameter of 5 mm into a hole with a diameter of 4.997 mm. By how much would the machinist have to lower the temperature of the rod to make it fit the hole?
Answer Preview: Given info Initial diameter 5 mm Diameter to be achieved by changing temperature 499…

, Chapter: 4 -Problem: 20 >> The highest altitude ever reached by a glider (as of this writing) is 15,460 m. What is the approximate air pressure at that altitude?
Answer Preview: To estimate the approximate air pressure at an altitude of 15 460 meters we can …

, Chapter: 7 -Problem: 30 >> An electric car is being designed to have an average power output of 4,000 W for 2 h before needing to be recharged. (Assume there is no wasted energy.) (a) How much energy would be stored in the charged batteries? (b) The batteries operate on 30 V. What would the current be when they are operating at 4,000 W? (c) To be able to recharge the batteries in 1 h, how much power would have to be supplie
Answer Preview: (a) To calculate the energy stored in the charged batteries, we can use the formula: Energy (in watt…

, Chapter: 9 -Problem: 37 >> If you were lost in the forest and wanted to start a small fire to keep warm or cook a meal using sunlight and a small lens, what type of lens—converging or diverging—would you use and why?
Answer Preview: Converging Lens after going through a converging lens light …

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, Chapter: 4 -Problem: 14 >> Believe it or not, canoes have been made out of concrete (and they actually float). But even though concrete has a lower density than aluminum, a concrete canoe weighs a lot more than an aluminum one of the same size. Why is that?
Answer Preview: The weight difference between a concrete canoe and an aluminum canoe of the same size despite concre…

, Chapter: 7 -Problem: 15 >> A solid metal cylinder has a certain resistance. It is then heated and carefully stretched to form a longer, thinner cylinder. After it cools, will its resistance be the same as, greater than, or less than what it was before? Explain your choice.
Answer Preview: The resistance will be greater because the …

, Chapter: 9 -Problem: 43 >> How is the magnification of a lens related to the object distance? How is it related to the image distance? What is the significance of the sign of the magnification? What is the significance of its magnitude (size)?
Answer Preview: Magnification m of a lens is related with object distance u as m f f u An…

, Chapter: 10 -Problem: 29 >> Describe the spectrum produced by ionized hydrogen—that is, a sample of hydrogen atoms all of which have lost one electron.
Answer Preview: Because all the electrons have …

, Chapter: 7 -Problem: 10 >> A defibrillator sends approximately 0.1 C of charge through a patient’s chest in about 2 ms. The average voltage during the discharge is approximately 3,000 V. Compute the average current that flows, the average power output, and the total energy consumed (Note: Only a small portion of this current actually flows through the heart in a typical defibrillating procedure. Much of the charge is diffus
Answer Preview: To compute the average current average power output and total energy consumed by the defibrillator w…

, Chapter: 6 -Problem: 28 >> A conditioning drill consists of repeatedly running from one end of a basketball court to the other, turning around and running back. Sometimes the drill is changed and the runner turns around at half court, or perhaps at three-fourths of the length of the court. Describe how the number of round-trips a runner can do each minute changes when the distance is changed and how this is related to a gui
Answer Preview: When the runner doesnt have to go the full court length hell be able to make the rou…

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, Chapter: 4 -Problem: 20 >> Is there a pressure variation (increase with depth) in a fuel tank on a spacecraft in orbit? Why or why not?
Answer Preview: In a spacecraft in orbit there is typically no pressure variation increase with depth in a fuel tank …

, Chapter: 5 -Problem: 5 >> Air molecules in a warm room (27°C = 300 K) typically have speeds of about 500 m/s (1,100 mph). Why is it that we are unaware of these fast-moving particles continuously colliding with our bodies?
Answer Preview: The reason we are unaware of air molecules continuously colliding with our bodies, despite their high speeds, is due to a few key factors related to t…

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, Chapter: 6 -Problem: 27 >> Describe how sound is produced in string instruments. Why does tightening a string change the frequency of the sound it makes?
Answer Preview: Striking or plucking a string produces a pulse that travels back and forth on the string…

, Chapter: 9 -Problem: 56 >> Suppose an explosion at a glass factory caused it to “rain” tiny spheres made of glass. Would the resulting rainbow be different from the normal one? If so, how might it be different and why?
Answer Preview: Why is it so important Diffraction is a natural phenome…

, Chapter: 10 -Problem: 19 >> If an astronomer examines the emission spectrum from luminous hydrogen gas that is moving away from Earth at a high speed and compares it to a spectrum of hydrogen seen in a laboratory on Earth, what would be different about the frequencies of spectral lines from the two sources?
Answer Preview: Because of the …

, Chapter: 4 -Problem: 15 >> Use conservation of energy to show that the speed with which water flows out of a tap near the bottom of an open container equals ?2gh where h is the height of the freestanding surface of the water above the tap. Assume that the water at the surface is moving with negligible velocity.
Answer Preview: To demonstrate that the speed with which water flows out of a tap near the bottom of an open contain…

, Chapter: 6 -Problem: 23 >> A recording of a high-frequency pure tone is played through both speakers of a portable stereo placed in an open field. A person a few meters in front of the stereo walks slowly along an arc around it. How does the sound that is heard change as the person moves?
Answer Preview: The sound will alternately be loudwhen the …

, Chapter: 9 -Problem: 22 >> What is the ideal shape of concave mirrors used in telescopes?
Answer Preview: The Ideal mirror used in a reflecting telescope is A parabolic shaped concave …

, Chapter: 1 -Problem: 9 >> A runner in a marathon passes the 5-mile mark at 1 o’clock and the 20-mile mark at 3 o’clock. What is the runner’s average speed during this time period?
Answer Preview: Given that At 1 clock he …

, Chapter: 5 -Problem: 18 >> Describe the three methods of heat transfer. Which of these are occurring around you at this moment?
Answer Preview: The three methods of heat transfer are conduction convection and radiation Conduction Conduction is …

, Chapter: 7 -Problem: 24 >> A representative lightning strike is caused by a voltage of 200,000,000 V and consists of a current of 1,000 A that flows for a fraction of a second. Calculate the power.
Answer Preview: P = VI = (…

, Chapter: 7 -Problem: 31 >> The resistance of an electric heater is 10 V when connected to 120 V. How much energy does it use during 30 min of operation?
Answer Preview: An electric heater is a device which converts an electric current into heat In this devise an electrical resistor is used that works on the principle of Joule heating Joule heating designates the process where electrical energy convert into heat energy when electric current passing through a resistor Electrical power in Watts P VI Where V is the voltage in Volts V I is the current in …

, Chapter: 4 -Problem: 17 >> Calculate the gauge pressure at a depth of 300 m in seawater.
Answer Preview: The gauge pressure at the depth of H in seawater gH wh…

, Chapter: 4 -Problem: 12 >> As a helium balloon rises up in the air, work is done on it against the force of gravity. What is doing the work? What energy transfer or transformation is taking place?
Answer Preview: As the balloon rises air moves in below it to take …

, Chapter: 8 -Problem: 5 >> Explain what superconducting electromagnets are. What advantages do they have over conventional electromagnets?
Answer Preview: You can demonstrate that moving electric charges produce magnetic fields by showing tha…

, Chapter: 7 -Problem: 17 >> All of the electrical outlets in a room are connected in a single parallel circuit. The circuit is equipped with a 20-A fuse, and the voltage is 120 V.(a) What is the maximum total power that can be supplied by the outlets without blowing the fuse?(b) How many 1,200-W appliances can be plugged into the sockets without blowing the fuse?
Answer Preview: a The maximum total power that can be supplied by …

, Chapter: 4 -Problem: 9 >> A large tanker truck can carry 20 tons (40,000 lb) of liquid. (a) What volume of water can it carry? (b) What volume of gasoline can it carry?
Answer Preview: 420049P A large tanker truck carries a weight Weigh…

, Chapter: 5 -Problem: 19 >> A potato will cook faster in a conventional oven if a large nail is inserted into it. Why?
Answer Preview: The statement that a potato will cook faster in a conventional oven if a large nail is inserted into …

, Chapter: 7 -Problem: 18 >> Explain what current, resistance, and voltage are.
Answer Preview: Current is the rate of flow of cha…

, Chapter: 9 -Problem: 51 >> The difference in speed between red light and violet light in glass is smaller than the difference in speed between the same two colors in a certain type of plastic. For which material, glass or plastic, would the angular spread of the two colored rays after entering the material obliquely from air be the largest? Why?
Answer Preview: The most striking examples of diffraction are those that inv…

, Chapter: 6 -Problem: 11 >> The frequency of middle C on the piano is 261.6 Hz.(a) What is the wavelength of sound with this frequency as it travels in air at room temperature? (b) What is the wavelength of sound with this frequency in water?
Answer Preview: a Consider room temp 20 C Speed of sound at room temp 344 ms …

, Chapter: 5 -Problem: 24 >> Suppose you hang a bag of ice inside a room in which the air is at normal room temperature. If you position the palm of your hand a few inches to the side of the ice, what would you feel? Why? Would you feel anything different if you placed your palm the same distance away but below the ice?
Answer Preview: Your palm would feel cool because it would be rece…

, Chapter: 5 -Problem: 3 >> During a workout, a shot-putter loses 0.175 kg of water through evaporation. The heat required to produce the evaporation (a phase change from liquid water to water vapor) comes from the athlete’s body. During his exercise, the shot-putter does 1.25 x 105 J of work. (a) Assuming it requires 2.42 x 106 J of energy to vaporize one kilogram of perspiration, find the amount of heat transferred from th
Answer Preview: Work is positive if done on a substance and is negative otherwise. In the case of …

, Chapter: 9 -Problem: 49 >> Two light waves that have wavelengths of 700 and 400 nm enter a block of glass (from air) with the same angle of incidence. Which has the larger angle of refraction? Why? Would the answer be different if the light waves were going from glass into air?
Answer Preview: The light waves having two different wavelength 700nm and 400nm which is moving with the same speed …

, Chapter: 10 -Problem: 16 >> What are the basic assumptions of the Bohr model? Describe how the Bohr model accounts for the production of emission-line spectra from elements like hydrogen.
Answer Preview: The basic assumptions of the Bohr model of the atom are i Electrons move about the nucleus of an ato…

, Chapter: 5 -Problem: 28 >> A piece of aluminum and a piece of iron fall without air resistance from the top of a building and stick into the ground on impact. Will their temperatures change by the same amount? Explain.
Answer Preview: The temperature of the iron will increase more than the …

, Chapter: 6 -Problem: 29 >> A special room contains a mixture of oxygen and helium that is breathable. Two musicians play a guitar and a flute in the room. Does each instrument sound different from when it is played in normal air? Why or why not?
Answer Preview: The speed of sound in an oxygen-helium mixture would be different than in air. If …

, Chapter: 1 -Problem: 1 >> A yacht is 20 m long. Express this length in feet.
Answer Preview: since in 1 inch112 f…

, Chapter: 5 -Problem: 18 >> Water flowing over the Lower Falls in Yellowstone National Park drops 94 m. If all of the water’s energy goes to heat it, what is its temperature increase?
Answer Preview: To solve this problem we can use the equation for the energy of a falling object E mgh where E is th…

, Chapter: 7 -Problem: 16 >> A student using a sensitive meter that measures resistance finds that the resistance of a thin wire is changed slightly when it is picked up with a bare hand. What causes the change in the resistance, and does it increase or decrease?
Answer Preview: The resistance in…

, Chapter: 3 -Problem: 7 >> A pitcher throws a 0.5-kg ball of clay at a 6-kg block of wood. The clay sticks to the wood on impact, and their joint velocity afterward is 3 m/s. What was the original speed of the clay?
Answer Preview: The values provided in the question are mass of th…

, Chapter: 5 -Problem: 26 >> In cold weather, you can sometimes “see” your breath. What you are seeing is a mist of small water droplets, the same as in clouds and fog. Suppose air leaves your mouth with temperature 35oC and humidity 0.035 kg/m3 and mixes with an equal amount of air at 5oC and humidity 0.005 kg/m3. (a) What is the relative humidity of the mixed air if its temperature and humidity equal the averages of those o
Answer Preview: a 100 after some water condenses out b The above graph shows that the mi…

, Chapter: 6 -Problem: 35 >> The highest musical note on the piano has a frequency of 4,186 Hz. Why would a tape of piano music sound terrible if played on a tape player that reproduces frequencies only up to 5,000 Hz?
Answer Preview: The sound of a note played on a piano is …

, Chapter: 5 -Problem: 25 >> The temperature of the air in thermals decreases about 10oC for each 1,000 m they rise. If a thermal leaves the ground with a temperature of 30oC and a relative humidity of 31 percent, at what altitude will the air become saturated and the water vapor begin to condense to form a cloud? (In other words, at what altitude does the temperature equal the dew point?)
Answer Preview: As we know that Relative humidity humidity x 100satu…

, Chapter: 4 -Problem: 9 >> Bicycle tires are often inflated to pressures as high as 75 psi, whereas automobile tires, which must support much heavier loads, are pumped to only 32 psi. Why is that? Explain.
Answer Preview: The volume of air in a bicycle tire is much less …

, Chapter: 6 -Problem: 4 >> A popular distraction in large crowds at sporting events since the 1980s is the “wave.” People in one section quickly stand up and raise their arms and then sit down; people in the neighboring sections follow suit in succession, resulting in a visible pattern in the crowd that travels around the stadium. Which of the two types of waves is this? Compared to the waves described in this chapter, how
Answer Preview: The stadium wave is a transverse wave. I…

, Chapter: 3 -Problem: 19 >> The kinetic energy of a motorcycle and rider is 60,000 J. If their total mass is 300 kg, what is their speed?
Answer Preview: Let m be the total mass and v be th…

, Chapter: 7 -Problem: 9 >> What is an electric field? Sketch the shape of the electric field around a single proton.
Answer Preview: An electric field is a region in which an electric charge experiences a force It is created by elect…

, Chapter: 7 -Problem: 1 >> All matter contains both positively and negatively charged particles. Why do most things have no net charge?
Answer Preview: Usually the number of positive…

, Chapter: 3 -Problem: 20 >> In compressing the spring in a toy dart gun, 0.5 J of work is done. When the gun is fired, the spring gives its potential energy to a dart with a mass of 0.02 kg. (a) What is the dart’s kinetic en

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