Description

Chapter: 10 -Problem: 11 >> A 1500 kg car traveling at 10 m/s suddenly runs out of gas while approaching the valley shown in FIGURE EX10.11. The alert driver immediately puts the car in neutral so that it will roll.What will be the car??s speed as it coasts into the gas station on the other side of the valley? Transcribed Image Text:
Answer Preview: Model Model the car as a particle with zero rolling fric…

, Chapter: 16 -Problem: 22 >> A hammer taps on the end of a 4.00-m-long metal bar at room temperature. A microphone at the other end of the bar picks up two pulses of sound, one that travels through the metal and one that travels through the air. The pulses are separated in time by 9.00 ms. What is the speed of sound in this metal?
Answer Preview: Solve Two pulses of sound are detected because one pulse trav…

, Chapter: 21 -Problem: 12 >> A gas following the pV trajectory of FIGURE EX21.12 does 60 J of work per cycle. What is pmax? Transcribed Image Text: P (kPa) Pmax 100 - V (cm) 0+ O 200 400 600 800 FIGURE EX21.12
Answer Preview: Solve The work done by the gas per …

, Chapter: 23 -Problem: 58 >> A 2.0-mm-diameter glass sphere has a charge of +1.0 nC. What speed does an electron need to orbit the sphere 1.0 mm above the surface?
Answer Preview: Model An orbiting electron experiences a force that cause…

, Chapter: 29 -Problem: 12 >> What are the magnetic fields at points a to c in FIGURE EX29.12? Give your answers as vectors. Transcribed Image Text: ? (?m) 10 A 1 Long wires a b -x (cm) 2 -1 10 A FIGURE EX29.12
Answer Preview: Model Assume the wires are infinitely long Visualize The field vectors are tangent …

, Chapter: 34 -Problem: 82 >> Consider an object of thickness ds (parallel to the axis) in front of a lens or mirror. The image of the object has thickness ds?. Define the longitudinal magnification as M = ds?/ds. Prove that M = -m2, where m is the lateral magnification.
Answer Preview: Visualize The lateral magnification is m s s Solve We n…

, Chapter: 31 -Problem: 55 >> You’ve recently read about a chemical laser that generates a 20-cm-diameter, 25 MW laser beam. One day, after physics class, you start to wonder if you could use the radiation pressure from this laser beam to launch small payloads into orbit. To see if this might be feasible, you do a quick calculation of the acceleration of a 20-cm-diameter, 100 kg, perfectly absorbing block. What speed would suc
Answer Preview: Model Assume that the block absorbs the laser light compl…

, Chapter: 13 -Problem: 23 >> A binary star system has two stars, each with the same mass as our sun, separated by 1.0 × 1012 m. A comet is very far away and essentially at rest. Slowly but surely, gravity pulls the comet toward the stars. Suppose the comet travels along a trajectory that passes through the midpoint between the two stars. What is the comet’s speed at the midpoint?
Answer Preview: Model Model the two stars as spherical masses and the comet …

, Chapter: 21 -Problem: 58 >> A heat engine using a monatomic gas follows the cycle shown in FIGURE P21.58. a. Find Ws, Q, and ?Eth for each process in the cycle. Display your results in a table.b. What is the thermal efficiency of this heat engine? Transcribed Image Text: p (kPa) Pmax 2 600 K 100- Adiabat 3 - V (cm³) 600 0+ 20
Answer Preview: Model For the closed cycle of the heat engine process 1 2 is isobaric process 2 3 is isochoric and p…

, Chapter: 15 -Problem: 36 >> A 350 g mass on a 45-cm-long string is released at an angle of 4.5° from vertical. It has a damping constant of 0.010 kg/s. After 25 s,(a) How many oscillations has it completed(b) How much energy has been lost?
Answer Preview: Model Model the string as massless Visualize Solve a First we find the period of the damped o…

, Chapter: 33 -Problem: 37 >> FIGURE P33.36 shows the light intensity on a screen behind a double slit. The slit spacing is 0.20 mm and the screen is 2.0 m behind the slits. What is the wavelength (in nm) of the light? Transcribed Image Text: Intensity (mW/m³) 124 ¥x(cm) FIGURE P33.36 2.0 cm
Answer Preview: Solve According to Equation 33 7 the fringe spacing between t…

, Chapter: 20 -Problem: 4 >> Integrated circuits are manufactured in vacuum chambers in which the air pressure is 1.0 × 10-10 mm of Hg. What are(a) The number density(b) The mean free path of a molecule? Assume T = 20°C.
Answer Preview: Solve a Air primarily comprises diatomic molecules so r 1 0 10 10 m Usin…

, Chapter: 14 -Problem: 11 >> A 20-cm-diameter circular cover is placed over a 10-cm diameter hole that leads into an evacuated chamber. The pressure in the chamber is 20 kPa. How much force is required to pull the cover off?
Answer Preview: Visualize We assume that the seal is at a radius of 5 cm Outside the …

, Chapter: 9 -Problem: 34 >> An 8.0 kg crate is pulled 5.0 m up a 30° incline by a rope angled 18° above the incline. The tension in the rope is 120 N, and the crate’s coefficient of kinetic friction on the incline is 0.25. a. How much work is done by tension, by gravity, and by the normal force? b. What is the increase in thermal energy of the crate and incline?
Answer Preview: Model Use the particle model the definition of work W F s and the model of kinetic friction Visualiz…

, Chapter: 7 -Problem: 62 >> A 50-cm-diameter, 400 g beach ball is dropped with a 4.0 mg ant riding on the top. The ball experiences air resistance, but the ant does not. What is the magnitude of the normal force exerted on the ant when the ball’s speed is 2.0 m/s?
Answer Preview: Model The air resistance on the ball is not negligible but it is on the ant the bal…

, Chapter: 18 -Problem: 6 >> How many atoms are in a 2.0 cm × 2.0 cm × 2.0 cm cube of aluminum?
Answer Preview: Solve The volume of the aluminum cube V 8 0 10 6 …

, Chapter: 20 -Problem: 38 >> From what height must an oxygen molecule fall in a vacuum so that its kinetic energy at the bottom equals the average energy of an oxygen molecule at 300 K?
Answer Preview: Visualize Solve The average energy of an oxygen …

, Chapter: 22 -Problem: 53 >> Suppose the magnitude of the proton charge differs from the magnitude of the electron charge by a mere 1 part in 109. a. What would be the force between two 2.0-mm-diameter copper spheres 1.0 cm apart? Assume that each copper atom has an equal number of electrons and protons. b. Would this amount of force be detectable? What can you conclude from the fact that no such forces are observed?
Answer Preview: Model Use the charge model and assume the copper spheres are point objec…

, Chapter: 28 -Problem: 16 >> What is the value of resistor R in FIGURE EX28.16? Transcribed Image Text: AV = 5.0 V 10 0 150 R ww www- FIGURE EX28.16 I= 100 mA
Answer Preview: Model Assume ideal connecting wires and an ideal battery Solve As shown in Figure EX…

, Chapter: 34 -Problem: 74 >> An object is 60 cm from a screen. What are the radii of a symmetric converging plastic lens (i.e., two equally curved surfaces) that will form an image on the screen twice the height of the object?
Answer Preview: Model Assume the symmetric converging lens is a thin lens Solve Because the lens fo…

, Chapter: 32 -Problem: 10 >> The average power dissipated by a resistor is 4.0 W. What is PR if: a. The resistance R is doubled while ?0 is held fixed? b. The peak emf ?0 is doubled while R is held fixed? c. Both are doubled simultaneously?
Answer Preview: a 8 0 W Use P R 1 2 I 2 R R b 16 W Doubling th…

, Chapter: 13 -Problem: 13 >> Suppose we could shrink the earth without changing its mass. At what fraction of its current radius would the free-fall acceleration at the surface be three times its present value?
Answer Preview: Model Model the earth e as a spherical mass Solve Let t…

, Chapter: 20 -Problem: 62 >> At what temperature does the rms speed of(a) A nitrogen molecule(b) A hydrogen molecule equal the escape speed from the earth’s surface?(c) You’ll find that these temperatures are very high, so you might think that the earth’s gravity could easily contain both gases. But not all molecules move with vrms. There is a distribution of speeds, and a small percentage of molecules have speeds several tim
Answer Preview: Solve a The escape speed is the speed with which a mass m can leave the earths surface and escape to …

, Chapter: 16 -Problem: 7 >> Draw the snapshot graph D(x, t = 1.0 s) at t = 1.0 s for the wave shown in FIGURE EX16.7. Transcribed Image Text: D (cm) - t (s) S 6 -2-1 -1| History graph of a wave at x =0 m Wave moving to the left at 1.0 m/s -2 –1 1 2 3 4 FIGURE EX16.7
Answer Preview: Model This is a wave traveling to the left at a constant speed …

, Chapter: 4 -Problem: 66 >> You are watching an archery tournament when you start wondering how fast an arrow is shot from the bow. Remembering your physics, you ask one of the archers to shoot an arrow parallel to the ground. You find the arrow stuck in the ground 60 m away, making a 3.0° angle with the ground. How fast was the arrow shot?
Answer Preview: Model Use the particle model for the arrow and the constant acceleration kinem…

, Chapter: 30 -Problem: 76 >> The switch in FIGURE P30.76 has been open for a long time. It is closed at t = 0 s. What is the current through the 20 ? resistor a. Immediately after the switch is closed?b. After the switch has been closed a long time?c. Immediately after the switch is reopened? Transcribed Image Text: 10 0 30 V =
Answer Preview: Model Assume an ideal inductor and an ideal battery i e zero internal resistance Solve a Because the switch has been open a long time no current is fl…

, Chapter: 18 -Problem: 44 >> 15°C, 2.0-cm-diameter aluminum bar just barely slips between two rigid steel walls 10.0 cm apart. If the bar is warmed to 25°C, how much force does it exert on each wall?
Answer Preview: Model Assume the aluminum Visualize The bar will try to expand b…

, Chapter: 8 -Problem: 10 >> A highway curve of radius 500 m is designed for traffic moving at a speed of 90 km/h. What is the correct banking angle of the road?
Answer Preview: Model The vehicle is to be treated as a particle in uniform circu…

, Chapter: 9 -Problem: 55 >> A 50 g rock is placed in a slingshot and the rubber band is stretched. The magnitude of the force of the rubber band on the rock is shown by the graph in FIGURE P9.55. The rubber band is stretched 30 cm and then released. What is the speed of the rock? Transcribed Image Text: Fsp (N) 60 40 - 20 -x (
Answer Preview: Model Assume that the rubber band behaves similar to a spring Also model the rock as a pa…

, Chapter: 26 -Problem: 14 >> The electric potential along the x-axis is V = 100x2 V, where x is in meters. What is Ex at(a) X = 0 m(b) X = 1 m?
Answer Preview: Model The electric field is the negative of the derivative of the potential f…

, Chapter: 16 -Problem: 80 >> You have just been pulled over for running a red light, and the police officer has informed you that the fine will be $250. In desperation, you suddenly recall an idea that your physics professor recently discussed in class. In your calmest voice, you tell the officer that the laws of physics prevented you from knowing that the light was red. In fact, as you drove toward it, the light was Doppler
Answer Preview: Model The Doppler effect for light of an approaching sour…

, Chapter: 21 -Problem: 9 >> The cycle of FIGURE EX21.9 consists of three processes. Make a table with rows labeled A€“C and columns labeled ΔEth, Ws, and Q. Fill each box in the table with +, -, or 0 to indicate whether the quantity increases, decreases, or stays the same during that process. Transcribed Image Text: Adiabat -
Answer Preview: Model Process A is adiabatic process B is isochoric and proce…

, Chapter: 22 -Problem: 59 >> You have a lightweight spring whose un-stretched length is 4.0 cm. First, you attach one end of the spring to the ceiling and hang a 1.0 g mass from it. This stretches the spring to a length of 5.0 cm. You then attach two small plastic beads to the opposite ends of the spring, lay the spring on a frictionless table, and give each plastic bead the same charge. This stretches the spring to a length
Answer Preview: Model The charged plastic beads are point charges and the spring is an ideal spring that …

, Chapter: 29 -Problem: 11 >> The magnetic field at the center of a 1.0-cm-diameter loop is 2.5 mT. a. What is the current in the loop? b. A long straight wire carries the same current you found in part a. At what distance from the wire is the magnetic field 2.5 mT?
Answer Preview: Model The magnetic field is that of a current loop Solve a …

, Chapter: 31 -Problem: 47 >> When the Voyager 2 spacecraft passed Neptune in 1989, it was 4.5 × 109 km from the earth. Its radio transmitter, with which it sent back data and images, broadcast with a mere 21 W of power. Assuming that the transmitter broadcast equally in all directions, a. What signal intensity was received on the earth? b. What electric field amplitude was detected? The received signal was somewhat stronger t
Answer Preview: Model Radio waves are electromagnetic waves Solve a The …

, Chapter: 12 -Problem: 62 >> A 120-cm-wide sign hangs from a 5.0 kg, 200-cm-long pole. A cable of negligible mass supports the end of the rod as shown in Figure P12.62. What is the maximum mass of the sign if the maximum tension in the cable without breaking is 300 N? Transcribed Image Text: Cable 250 cm 200 cm PHYSICS SHOPPE
Answer Preview: Model The pole is a uniform rod The sign is also uniform Visualize Solve The g…

, Chapter: 16 -Problem: 4 >> Draw the history graph D(x = 4.0 m, t) at x = 4.0 m for the wave shown in FIGURE EX16.4. Transcribed Image Text: D (cm) 14 -x (m) 5 6 7 1 2 3 -1| 1.0 m/s» Snapshot graph of a wave at f = 2 s FIGURE EX16.4
Answer Preview: Model This is a wave traveling at constant speed The pulse moves 1 m to the …

, Chapter: 8 -Problem: 61 >> A 1500 kg car starts from rest and drives around a flat 50-m-diameter circular track. The forward force provided by the car’s drive wheels is a constant 1000 N. a. What are the magnitude and direction of the car’s acceleration at t = 10 s? Give the direction as an angle from the r-axis. b. If the car has rubber tires and the track is concrete, at what time does the car begin to slide out of the ci
Answer Preview: Model Model the car as a particle on a circular track Visualize Solve a …

, Chapter: 30 -Problem: 73 >> For your final exam in electronics, you’re asked to build an LC circuit that oscillates at 10 kHz. In addition, the maximum current must be 0.10 A and the maximum energy stored in the capacitor must be 1.0 × 10-5 J. What values of inductance and capacitance must you use?
Answer Preview: Model Assume there is no resistance in the LC circuit Visuali…

, Chapter: 18 -Problem: 30 >> A rigid container holds hydrogen gas at a pressure of 3.0 atm and a temperature of 20°C. What will the pressure be if the temperature is lowered to -20°C?
Answer Preview: Model The gas is assumed to be ideal and since the contain…

, Chapter: 8 -Problem: 26 >> A heavy ball with a weight of 100 N (m = 10.2 kg) is hung from the ceiling of a lecture hall on a 4.5-m-long rope. The ball is pulled to one side and released to swing as a pendulum, reaching a speed of 5.5 m/s as it passes through the lowest point. What is the tension in the rope at that point?
Answer Preview: Model The ball is a particle on a massless rope in circular motion about the point where th…

, Chapter: 7 -Problem: 72 >> FIGURE CP7.57 shows a 200 g hamster sitting on an 800 g wedge-shaped block. The block, in turn, rests on a spring scale. An extra-fine lubricating oil having μs= μk= 0 is sprayed on the top surface of the block, causing the hamster to slide down. Friction between the block and the scale is large enough that the block does not slip on the scale. What does the scale read, in grams, as the hamster
Answer Preview: Model The hamster of mass m and the wedge with mass M will be treated as objects 1 and 2 respectivel…

, Chapter: 26 -Problem: 20 >> Light from the sun allows a solar cell to move electrons from the positive to the negative terminal, doing 2.4 × 10-19 J of work per electron. What is the emf of this solar cell?
Answer Preview: Solve The work done is the potential energ…

, Chapter: 16 -Problem: 42 >> An opera singer in a convertible sings a note at 600 Hz while cruising down the highway at 90 km/h. What is the frequency heard by a. A person standing beside the road in front of the car? b. A person on the ground behind the car?
Answer Preview: Model The frequency of the opera singers note is altered b…

, Chapter: 21 -Problem: 30 >> A heat engine operating between energy reservoirs at 20°C and 600°C has 30% of the maximum possible efficiency. How much energy must this engine extract from the hot reservoir to do 1000 J of work?
Answer Preview: Model The maximum possible efficiency for a heat engine is …

, Chapter: 23 -Problem: 12 >> The electric field 5.0 cm from a very long charged wire is (2000 N/C, toward the wire). What is the charge (in nC) on a 1.0-cm-long segment of the wire?
Answer Preview: Model Assume that the wire is thin and that the charge lies on the wire along a …

, Chapter: 38 -Problem: 28 >> What is the radius of a hydrogen atom whose electron is bound by 0.378 eV?
Answer Preview: Model Assume the electron is in one of the stati…

, Chapter: 28 -Problem: 23 >> What is the value of resistor R in FIGURE EX28.23? Transcribed Image Text: 2A AV = 8 V 10n :150 R FIGURE EX28.23
Answer Preview: Model Assume ideal connecting wires Solve The resistance R is …

, Chapter: 31 -Problem: 10 >> A vertically polarized electromagnetic wave passes through the five polarizers in FIGURE Q31.10. Rank in order, from largest to smallest, the transmitted intensities Iato Ie. Transcribed Image Text: P
Answer Preview: I d I c I b I a The intensity passing th…

, Chapter: 12 -Problem: 49 >> A 300 g ball and a 600 g ball are connected by a 40-cm-long massless, rigid rod. The structure rotates about its center of mass at 100 rpm. What is its rotational kinetic energy?
Answer Preview: Model The structure is a rigid body rotating about its center of mas…

, Chapter: 15 -Problem: 77 >> A solid sphere of mass M and radius R is suspended from a thin rod, as shown in FIGURE CP15.77. The sphere can swing back and forth at the bottom of the rod. Find an expression for the frequency f of small angle oscillations. Transcribed Image Text: Pivot R
Answer Preview: Model Model the sphere as a small angle physical pendu…

, Chapter: 33 -Problem: 60 >> Scientists shine a laser beam on a 35-?m@wide slit and produce a diffraction pattern on a screen 70 cm behind the slit. Careful measurements show that the intensity first falls to 25% of maximum at a distance of 7.2 mm from the center of the diffraction pattern. What is the wavelength of the laser light?
Answer Preview: Model The slit produces a single slit diffraction pattern The angles are small enough to justify the …

, Chapter: 19 -Problem: 78 >> A beaker with a metal bottom is filled with 20 g of water at 20°C. It is brought into good thermal contact with a 4000 cm3 container holding 0.40 mol of a monatomic gas at 10 atm pressure. Both containers are well insulated from their surroundings. What is the gas pressure after a long time has elapsed? You can assume that the containers themselves are nearly massless and do not affect the outcome
Answer Preview: Model We have two interacting systems the water and the gas For the closed system compri…

, Chapter: 14 -Problem: 9 >> A 50-cm-thick layer of oil floats on a 120-cm-thick layer of water. What is the pressure at the bottom of the water layer?
Answer Preview: Model The density of oil is oil 900 kg m 3 and the density of …

, Chapter: 9 -Problem: 26 >> A 35-cm-long vertical spring has one end fixed on the floor. Placing a 2.2 kg physics textbook on the spring compresses it to a length of 29 cm. What is the spring constant?
Answer Preview: Model Assume the book is stationary so the …

, Chapter: 26 -Problem: 5 >> Estimate the electric fields E1and E2at points 1 and 2 in Figure Q26.5. Don€™t forget that E is a vector. Transcribed Image Text: OV 10 V 20 V 30 V 40 V 2 ? 0m 2 m 3 m 4 m FIGURE Q26.5
Answer Preview: Both fields point left in …

, Chapter: 16 -Problem: 61 >> A string that is under 50.0 N of tension has linear density 5.0 g/m. A sinusoidal wave with amplitude 3.0 cm and wavelength 2.0 m travels along the string. What is the maximum speed of a particle on the string?
Answer Preview: Model The wave is traveling on a stretched str…

, Chapter: 20 -Problem: 39 >> Dust particles are ? 10 mm in diameter. They are pulverized rock, with ? ? 2500 kg/m3. If you treat dust as an ideal gas, what is the rms speed of a dust particle at 20°C?
Answer Preview: Solve Mass m of a dust par…

, Chapter: 23 -Problem: 50 >> A sphere of radius R and surface charge density ? is positioned with its center distance 2R from an infinite plane with surface charge density ?. At what distance from the plane, along a line toward the center of the sphere, is the electric field zero?
Answer Preview: Model The electric field of a sphere of charge is the same …

, Chapter: 38 -Problem: 44 >> A 75 kW radio transmitter emits 550 kHz radio waves uniformly in all directions. At what rate do photons strike a 1.5-m-tall, 3.0-mm-diameter antenna that is 15 km away?
Answer Preview: Model Use the photon model of radio waves Visualize The ratio …

, Chapter: 28 -Problem: 13 >> A standard 100 W (120 V) lightbulb contains a 7.0-cm-long tungsten filament. The high-temperature resistivity of tungsten is 9.0 × 10-7 ? m. What is the diameter of the filament?
Answer Preview: Model The 100 W rating is for operating at 120 V Solve A …

, Chapter: 31 -Problem: 33 >> In FIGURE P31.33, a circular loop of radius r travels with speed v along a charged wire having linear charge density ?. The wire is at rest in the laboratory frame, and it passes through the center of the loop. a. What are E and B at a point on the loop as measured by a scientist in the laboratory? Include both strength and direction.b. What are the fields E and B at a point on the loop as measur
Answer Preview: Model Use the Galilean transformation of fields Assume that the wire is infinite Visualize The …

, Chapter: 13 -Problem: 17 >> A rocket is launched straight up from the earth’s surface at a speed of 15,000 m/s. What is its speed when it is very far away from the earth?
Answer Preview: Model Model the earth e as a spherical mass Compared to the earths s…

, Chapter: 15 -Problem: 64 >> A penny rides on top of a piston as it undergoes vertical simple harmonic motion with an amplitude of 4.0 cm. If the frequency is low, the penny rides up and down without difficulty. If the frequency is steadily increased, there comes a point at which the penny leaves the surface. a. At what point in the cycle does the penny first lose contact with the piston? b. What is the maximum frequency for
Answer Preview: Visualize Solve a Newtons second law applied to the penn…

, Chapter: 4 -Problem: 9 >> Anita is running to the right at 5 m/s in FIGURE Q4.8. Balls 1 and 2 are thrown toward her by friends standing on the ground. According to Anita, both balls are approaching her at 10 m/s.Which ball was thrown at a faster speed? Or were they thrown with the same speed? Explain.Figure Q4.8 Transcribed Image Text:
Answer Preview: Anita is approaching ball 2 and moving away from where ball 1 was thrown so b…

, Chapter: 30 -Problem: 67 >> FIGURE P30.67 shows the potential difference across a 50 mH inductor. The current through the inductor at t = 0 s is 0.20 A. Draw a graph showing the current through the inductor from t = 0 s to t = 40 ms. Transcribed Image Text: AV (V) 2 1 1 (ms) 10 20 30 40 FIGURE P30.67
Answer Preview: Model Assume we can ignore the edges when the potential difference changes abruptly Visualize The ex…

, Chapter: 19 -Problem: 81 >> 0.020 mol of a diatomic gas, with initial temperature 20°C, are compressed from 1500 cm3 to 500 cm3 in a process in which pV2 = constant. How much heat energy is added during this process?
Answer Preview: Model Assume the gas is ideal The process is not adiabatic despite Equation 19 35 beca…

, Chapter: 14 -Problem: 13 >> What is the height of a water barometer at atmospheric pressure?
Answer Preview: Model The density of water is 1000 kg m 3 Visualize Please refer to Figure 14 …

, Chapter: 7 -Problem: 73 >> FIGURE CP7.58 shows three hanging masses connected by massless strings over two massless, frictionless pulleys. (a) Find the acceleration constraint for this system. It is a single equation relating a1y, a2y, and a3y. (b) Find an expression for the tension in string A. (c) Suppose: m1= 2.5 kg, m2= 1.5 kg, and m3= 4.0 kg. Find the acceleration of each. (d) The 4.0 kg mass would appear to be in equi
Answer Preview: Model The hanging masses m 1 m 2 and m 3 are modeled as particles Pulleys A and B are massless and f…

, Chapter: 26 -Problem: 22 >> What is the capacitance of the two metal spheres shown in Figure EX26.22? Transcribed Image Text: -20 nC +20 nC FIGURE EX26.22 AV = 100 V
Answer Preview: Solve Any two electrodes regardle…

, Chapter: 16 -Problem: 72 >> Your ears are sensitive to differences in pitch, but they are not very sensitive to differences in intensity. You are not capable of detecting a difference in sound intensity level of less than 1 dB. By what factor does the sound intensity increase if the sound intensity level increases from 60 dB to 61 dB?
Answer Preview: Solve If we solve the equation for I we …

, Chapter: 20 -Problem: 33 >> A rigid container holds 0.20 g of hydrogen gas. How much heat is needed to change the temperature of the gas a. From 50 K to 100 K? b. From 250 K to 300 K? c. From 2250 K to 2300 K?
Answer Preview: Visualize At low temperatures C v 3 2 R 12 5 J mol K At …

, Chapter: 23 -Problem: 55 >> A positron is an elementary particle identical to an electron except that its charge is +e. An electron and a positron can rotate about their center of mass as if they were a dumbbell connected by a massless rod. What is the orbital frequency for an electron and a positron 1.0 nm apart?
Answer Preview: Model The orbital motion of the positron electron system about their center of ma…

, Chapter: 38 -Problem: 6 >> A photoelectric-effect experiment finds a stopping potential of 1.56 V when light of 200 nm is used to illuminate the cathode. a. From what metal is the cathode made? b. What is the stopping potential if the intensity of the light is doubled?
Answer Preview: Solve a A metal can be identified by its work function From Equatio…

, Chapter: 28 -Problem: 24 >> A metal wire of resistance R is cut into two pieces of equal  length. The two pieces are connected together side by side. What  is the resistance of the two connected wires?
Answer Preview: Visualize The figure shows a metal wire of re…

, Chapter: 32 -Problem: 6 >> A 200 ? resistor is connected to an AC source with ?0 = 10 V. What is the peak current through the resistor if the emf frequency is(a) 100 Hz?(b) 100 kHz?
Answer Preview: Visualize Please refer to Figure 32 4 for an AC resistor circuit Figure …

, Chapter: 13 -Problem: 24 >> The asteroid belt circles the sun between the orbits of Mars and Jupiter. One asteroid has a period of 5.0 earth years. What are the asteroid’s orbital radius and speed?
Answer Preview: Model Model the sun s as a spherical mass and the asteroid a as a point …

, Chapter: 15 -Problem: 69 >> A spring with spring constant 15.0 N/m hangs from the ceiling. A 500 g ball is attached to the spring and allowed to come to rest. It is then pulled down 6.0 cm and released. What is the time constant if the ball’s amplitude has decreased to 3.0 cm after 30 oscillations?
Answer Preview: Model The vertical oscillations are damped and follow simple harmonic motio…

, Chapter: 4 -Problem: 22 >> You have a remote-controlled car that has been programmed to have velocity where t is in s. At t = 0 s, the car is at What are the car€™s(a) Position vector and(b) Acceleration vector at t = 2.0 s? Transcribed Image Text: 3= (-3tî + 2t²f) m/s, To = (3.0î + 2.0) m.
Answer Preview: a To find the position we take the inte…

, Chapter: 33 -Problem: 54 >> You’ve found an unlabeled diffraction grating. Before you can use it, you need to know how many lines per mm it has. To find out, you illuminate the grating with light of several different wavelengths and then measure the distance between the two first-order bright fringes on a viewing screen 150 cm behind the grating. Your data are as follows:Wavelength (nm)....................Distance (cm) 430..
Answer Preview: Model Assume the incident light is coherent and monochromatic Visualize The distances given …

, Chapter: 18 -Problem: 18 >> What is the temperature in °F and the pressure in Pa at the triple point of(a) Water(b) Carbon dioxide?
Answer Preview: Solve a The triple point of water is T …

, Chapter: 14 -Problem: 10 >> Gas flows through the pipe of FIGURE Q14.10. You can€™t see into the pipe to know how the inner diameter changes. Rank  in order, from largest to smallest, the gas speeds va, vb, and vcat points a, b, and c. Explain. Transcribed Image Text: b Liquid - FIGURE Q14.10
Answer Preview: The lower the velocity of fluid the higher the pressure at a given point in the pipe Bernou…

, Chapter: 7 -Problem: 65 >> A rocket burns fuel at a rate of 5.0 kg/s, expelling the exhaust gases at a speed of 4.0 km/s relative to the rocket. We would like to find the thrust of the rocket engine. (a) Model the fuel burning as a steady ejection of small pellets, each with the small mass ?m. Suppose it takes a short time ?t to accelerate a pellet (at constant acceleration) to the exhaust speed vex. Further, suppose the ro
Answer Preview: Model No air resistance in space Visualize The small pellet of fuel a…

, Chapter: 10 -Problem: 9 >> A compressed spring launches a block up an incline. Which objects should be included within the system in order to make an energy analysis as easy as possible?
Answer Preview: Assume the air resistance is neg…

, Chapter: 16 -Problem: 68 >> The sound intensity 50 m from a wailing tornado siren is 0.10 W/m2. a. What is the intensity at 1000 m? b. The weakest intensity likely to be heard over background noise is ? 1 ?W/m2. Estimate the maximum distance at which the siren can be heard.
Answer Preview: Model We have a traveling wave radiated by the tornad…

, Chapter: 20 -Problem: 8 >> The molecules in a six-particle gas have velocitiesCalculate(a) vavg,(b) vavg,(c) vrms. Transcribed Image Text: V1 = (20î – 30) m/s V2 = (40î + 70î) m/s V3 = (-80î + 20?) m/s V = 30î m/s Vs = (40î – 407) m/s 36 = (-50î – 203) m/s %3D %3D
Answer Preview: Solve a In tabular form we have Particle v x m s v y m s v x 2 m s 2 v y 2 m s 2 v …

, Chapter: 22 -Problem: 56 >> A 2.0 g metal cube and a 4.0 g metal cube are 6.0 cm apart, measured between their centers, on a horizontal surface. For both, the coefficient of static friction is 0.65. Both cubes, initially neutral, are charged at a rate of 7.0 nC/s. How long after charging begins does one cube begin to slide away? Which cube moves first?
Answer Preview: Model Even though they are cubes rather than spheres as…

, Chapter: 38 -Problem: 27 >> The allowed energies of a simple atom are 0.00 eV, 4.00 eV, and 6.00 eV. a. Draw the atom’s energy-level diagram. Label each level with the energy and the quantum number. b. What wavelengths appear in the atom’s emission spectrum? c. What wavelengths appear in the atom’s absorption spectrum?
Answer Preview: Model To conserve energy the emission and the absorption spectra must have exactl…

, Chapter: 28 -Problem: 6 >> Rank in order, from largest to smallest, the powers Pato Pddissipated by the four resistors in FIGURE Q28.6. Transcribed Image Text: 2 ?? 2 ?? ?? ww ww 2R 2R a FIGURE Q28.6
Answer Preview: Calculate P V 2 R …

, Chapter: 32 -Problem: 9 >> The current in a series RLC circuit lags the emf by 20°. You cannot change the emf. What two different things could you do to the circuit that would increase the power delivered to the circuit by the emf?
Answer Preview: The power will increas…

, Chapter: 13 -Problem: 32 >> a. At what height above the earth is the free-fall acceleration 10% of its value at the surface? b. What is the speed of a satellite orbiting at that height?
Answer Preview: Model Model the earth e as a spherical mass and the satellit…

, Chapter: 16 -Problem: 2 >> The wave speed on a string is 150 m/s when the tension is 75 N. What tension will give a speed of 180 m/s?
Answer Preview: Model The wave is a traveling wave on a stre…

, Chapter: 4 -Problem: 52 >> A 5.0-m-diameter merry-go-round is initially turning with a 4.0 s period. It slows down and stops in 20 s.a. Before slowing, what is the speed of a child on the rim?b. How many revolutions does the merry-go-round make as it stops?
Answer Preview: Model Model the child on the merry go round as a pa…

, Chapter: 30 -Problem: 46 >> FIGURE P30.46 shows a 4.0-cm-diameter loop with resistance 0.10 ? around a 2.0-cm-diameter solenoid. The solenoid is 10 cm long, has 100 turns, and carries the current shown in the graph. A positive current is cw when seen from the left. Find the current in the loop at (a) T = 0.5 s, (b) T = 1.5 s, (c) T = 2.5 s. Transcri
Answer Preview: Model Since the solenoid is fairly long compared to its diameter and the loop is located near the ce…

, Chapter: 19 -Problem: 18 >> A scientist whose scale is broken but who has a working 2.5 kW heating coil and a thermometer decides to improvise to determine the mass of a block of aluminum she has recently acquired. She heats the aluminum for 30 s and finds that its temperature increases from 20°C to 35°C. What is the mass of the aluminum?
Answer Preview: Model Assume the heating is 100 efficient Visualize The temperature change is T 35C 20C 15C …

, Chapter: 14 -Problem: 67 >> Air flows through the tube shown in FIGURE P14.67. Assume that air is an ideal fluid. a. What are the air speeds v1and v2at points 1 and 2? b. What is the volume flow rate? Transcribed Image Text: 2.0 mm 2. 1.0 cm Air 10 cm Hg FIGURE P14.67
Answer Preview: Model The ideal fluid i e air obeys Bernoullis equation Visualize Th…

, Chapter: 9 -Problem: 13 >> What is the angle ? between vectors A u and Bu in each part of Exercise 12?Exercise 12a. A = 3i? + 4j? and B = 2i? - 6j?. b. A = 3i? - 2j? and B = 6i? + 4j?.
Answer Preview: Solve a The length of A is The lengt…

, Chapter: 10 -Problem: 18 >> A block sliding along a horizontal frictionless surface with speed v collides with a spring and compresses it by 2.0 cm. What will be the compression if the same block collides with the spring at a speed of 2v?
Answer Preview: Model Assume an ideal spring that obeys Hookes law Since there is no friction the mechanic…

, Chapter: 18 -Problem: 10 >> A gas undergoes the process shown in FIGURE Q18.10. By what factor does the temperature change? Transcribed Image Text: FIGURE Q18.10
Answer Preview: We want T 2 T 1 but …

, Chapter: 21 -Problem: 3 >> A heat engine extracts 55 kJ of heat from the hot reservoir each cycle and exhausts 40 kJ of heat. What are(a) The thermal efficiency(b) The work done per cycle?
Answer Preview: Solve a During each cycle the heat transferred into …

, Chapter: 23 -Problem: 56 >> Your physics assignment is to figure out a way to use electricity to launch a small 6.0-cm-long plastic drink stirrer. You decide that you€™ll charge the little plastic rod by rubbing it with fur, then hold it near a long, charged wire, as shown in FIGURE P23.56. When you let go, the electric force of the wire on the plastic rod will shoot it away. Suppose you can uniformly charge the plastic stir
Answer Preview: Model The long charged wire is an infinite line of charge The charges on the wire and the plastic ro…

, Chapter: 38 -Problem: 9 >> What is the energy, in eV, of(a) A 450 MHz radio-frequency photon,(b) A visible-light photon with a wavelength of 450 nm,(c) An x-ray photon with a wavelength of 0.045 nm?
Answer Preview: Solve a From Equation 38 4 the energy o…

, Chapter: 28 -Problem: 14 >> A typical American family uses 1000 kWh of electricity a month. a. What is the average current in the 120 V power line to the house? b. On average, what is the resistance of a household?
Answer Preview: Solve a The average power consumed by a ty…

, Chapter: 31 -Problem: 12 >> What is the magnetic field amplitude of an electromagnetic wave whose electric field amplitude is 10 V/m?
Answer Preview: Model The electric and magnetic …

, Chapter: 12 -Problem: 87 >> A rod of length L and mass M has a nonuniform mass distribution. The linear mass density (mass per length) is ? = cx2, where x is measured from the center of the rod and c is a constant. a. What are the units of c? b. Find an expression for c in terms of L and M. c. Find an expression in terms of L and M for the moment of inertia of the rod for rotation about an axis through the center.
Answer Preview: Solve a In S I units comes in kg m Since x comes in m for the units of cx 2 to be kg …

, Chapter: 22 -Problem: 17 >> What is the net electric force on charge A in FIGURE EX22.17? Transcribed Image Text: 1.0 nC -1.0 nC 4.0 nC B 1.0 cm 1.0 cm
Answer Preview: Model Charges A B and C are point charges Visualize Charge A experiences an electri…

, Chapter: 15 -Problem: 37 >> The motion of a particle is given by x(t) = (25 cm)cos(10 t), where t is in s. What is the first time at which the kinetic energy is twice the potential energy?
Answer Preview: Model The particle is in simple harmonic motion Solve The equat…

, Chapter: 4 -Problem: 29 >> A baseball player friend of yours wants to determine his pitching speed. You have him stand on a ledge and throw the ball horizontally from an elevation 4.0 m above the ground. The ball lands 25 m away. What is his pitching speed?
Answer Preview: Model The particle model for the ball and the constant accel…

, Chapter: 33 -Problem: 63 >> One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. Having recently studied optics in your physics class, you’re not too surprised to see that the patch of light seems to be a circular diffraction pattern. It appears that the central maximum is about 1 cm across, and you estimate that t
Answer Preview: Model Light passing through a circular aperture leads to a diffraction pattern that has …

, Chapter: 18 -Problem: 32 >> 0.10 mol of argon gas is admitted to an evacuated 50 cm3 container at 20°C. The gas then undergoes an isochoric heating to a temperature of 300°C. a. What is the final pressure of the gas? b. Show the process on a pV diagram. Include a proper scale on both axes.
Answer Preview: Model In an isochoric process the volume of the container s…

, Chapter: 14 -Problem: 11 >> Wind blows over the house in FIGURE Q14.11. A window on the ground floor is open. Is there an airflow through the house? If so, does the air flow in the window and out the chimney, or in the chimney and out the window? Explain. Transcribed Image Text: Wind FIGURE Q14.11
Answer Preview: The pressure is reduced at the chimney due to the movement of the win…

, Chapter: 7 -Problem: 50 >> The coefficient of static friction is 0.60 between the two blocks in FIGURE P7.35. The coefficient of kinetic friction between the lower block and the floor is 0.20. Force F causes both blocks to cross a distance of 5.0 m, starting from rest. What is the least amount of time in which this motion can be completed without the top block sliding on the lower block?
Answer Preview: Model The 3 kg and 4 kg blocks constitute the system and are to be treated as …

, Chapter: 10 -Problem: 13 >> A cannon tilted up at a 30° angle fires a cannon ball at 80 m/s from atop a 10-m-high fortress wall. What is the ball’s impact speed on the ground below?
Answer Preview: Model This is case of free fall so the sum of the kinetic and gravit…

, Chapter: 16 -Problem: 43 >> A bat locates insects by emitting ultrasonic “chirps” and then listening for echoes from the bugs. Suppose a bat chirp has a frequency of 25 kHz. How fast would the bat have to fly, and in what direction, for you to just barely be able to hear the chirp at 20 kHz?
Answer Preview: Model The bats chirping frequency is altered by the Doppler effect The frequency is i…

, Chapter: 20 -Problem: 9 >> Eleven molecules have speeds 15, 16, 17, … , 25 m/s. Calculate(a) vavg(b) vrms.
Answer Preview: Solve a The average speed …

, Chapter: 23 -Problem: 62 >> The ozone molecule O3 has a permanent dipole moment of 1.8 × 10-30 C m. Although the molecule is very slightly bent—which is why it has a dipole moment—it can be modeled as a uniform rod of length 2.5 × 10-10 m with the dipole moment perpendicular to the axis of the rod. Suppose an ozone molecule is in a 5000 N/C uniform electric field. In equilibrium, the dipole moment is aligned with the electri
Answer Preview: Model Model the ozone molecule as a uniform rod Visualize When the molecule is rotated …

, Chapter: 38 -Problem: 9 >> FIGURE Q38.9 is a simulation of the electrons detected behind two closely spaced slits. Each bright dot represents one electron. How will this pattern change if a. The electron-beam intensity is increased?b. The electron speed is reduced?c. The electrons are replaced by neutrons?d. The left slit is closed?Your answers should consider the number of dots on the screen and the spacing, width, and po
Answer Preview: a The number of dots will increase but will still a…

, Chapter: 29 -Problem: 14 >> What are the magnetic field strength and direction at points a to c in FIGURE EX29.14? Transcribed Image Text: a. ]2.0 cm 10 A b. 4.0 cm 10 A [2.0 cm c. FIGURE EX29.14
Answer Preview: Model Assume the wires are infinitely long Solve The magn…

, Chapter: 31 -Problem: 6 >> The magnetic field is uniform over each face of the box shown in FIGURE EX31.6. What are the magnetic field strength and direction on the front surface? Transcribed Image Text: 2T 2T 3 T 3T 1 cm 2 cm FIGURE EX31.6 1 cm 1T
Answer Preview: Model The net magnetic flux over a closed surface is zero Solve Because we cant enclose a net po…

, Chapter: 13 -Problem: 21 >> You have been visiting a distant planet. Your measurements have determined that the planet’s mass is twice that of earth but the free-fall acceleration at the surface is only one-fourth as large. a. What is the planet’s radius? b. To get back to earth, you need to escape the planet. What minimum speed does your rocket need?
Answer Preview: Model Model the distant planet p and the earth e as spherical masse…

, Chapter: 21 -Problem: 60 >> FIGURE P21.60 is the pV diagram of Example 21.2, but now the device is operated in reverse. a. During which processes is heat transferred into the gas?b. Is this QH, heat extracted from a hot reservoir, or QC, heat extracted from a cold reservoir? Explain.c. Determine the values of QH and QC.d. Is the area inside the curve Win or Wout? What is its value?e. The device is now being operated in a ccw
Answer Preview: Model Processes 2 1 and 4 3 are isobaric Processes 3 2 and 1 4 are isochoric Visualize Solve a Excep…

, Chapter: 15 -Problem: 39 >> For a particle in simple harmonic motion, show that vmax = (?/2)vavg, where vavg is the average speed during one cycle of the motion.
Answer Preview: Solve Average speed is v avg x …

, Chapter: 8 -Problem: 43 >> A 4.4-cm-diameter, 24 g plastic ball is attached to a 1.2-m-long string and swung in a vertical circle. The ball’s speed is 6.1 m/s at the point where it is moving straight up. What is the magnitude of the net force on the ball? Air resistance is not negligible.
Answer Preview: Model The ball is in nonuniform circular motion Visualize Use r for the radius of the ball …

, Chapter: 30 -Problem: 51 >> A small, 2.0-mm-diameter circular loop with R = 0.020 ? is at the center of a large 100-mm-diameter circular loop. Both loops lie in the same plane. The current in the outer loop changes from +1.0 A to -1.0 A in 0.10 s. What is the induced current in the inner loop?
Answer Preview: Model The inner loop is small enough that the field due to the outer …

, Chapter: 19 -Problem: 66 >> A cylinder with a movable piston contains n moles of gas at a temperature higher than that of the surrounding environment. An external force on the piston keeps the pressure constant while the gas cools as ?T = (?T)0e-t/?, where ?T is the temperature difference between the gas and the environment, (?T)0 is the initial temperature difference, and t is the time constant. a. Find an expression for th
Answer Preview: Model Assume an ideal gas The process is isobaric Assume the temperature of the environment …

, Chapter: 8 -Problem: 1 >> As a science fair project, you want to launch an 800 g model rocket straight up and hit a horizontally moving target as it passes 30 m above the launch point. The rocket engine provides a constant thrust of 15.0 N. The target is approaching at a speed of 15 m/s. At what horizontal distance between the target and the rocket should you launch?
Answer Preview: Model The model rocket and the target will be treated as particles The kinem…

, Chapter: 7 -Problem: 41 >> FIGURE P7.26 shows two strong magnets on opposite sides of a small table. The long-range attractive force between the magnets keeps the lower magnet in place. (a) Draw an interaction diagram and draw free-body diagrams for both magnets and the table. Use dashed lines to connect the members of an action/reaction pair. (b) The lower magnet is being pulled upward against the bottom of the table. Supp
Answer Preview: a Visualize The upper magnet is labeled U and the lower magnet L Each magnet exerts a long range mag…

, Chapter: 9 -Problem: 62 >> When you ride a bicycle at constant speed, nearly all the energy you expend goes into the work you do against the drag force of the air. Model a cyclist as having cross-section area 0.45 m2 and, because the human body is not aerodynamically shaped, a drag coefficient of 0.90. a. What is the cyclist’s power output while riding at a steady 7.3 m/s (16 mph)? b. Metabolic power is the rate at which yo
Answer Preview: Model We will ignore rolling friction because it is much less than the drag …

, Chapter: 17 -Problem: 52 >> Deep-sea divers often breathe a mixture of helium and oxygen to avoid getting the “bends” from breathing high pressure nitrogen. The helium has the side effect of making the divers’ voices sound odd. Although your vocal tract can be roughly described as an open-closed tube, the way you hold your mouth and position your lips greatly affects the standing wave frequencies of the vocal tract. This is
Answer Preview: Model Model the vocal tract as an open closed tube that forms standing waves Solve Th…

, Chapter: 21 -Problem: 37 >> A heat engine with 50% of the Carnot efficiency operates between reservoirs at 20°C and 200°C. The engine inputs heat energy at an average rate of 63 W while compressing a spring 22 cm in 0.50 s. What is the spring constant?
Answer Preview: Model Assume an ideal spring for which U 1 2 k x 2 Visualize We are given T C 293 K Q H 63 J …

, Chapter: 22 -Problem: 67 >> An electric field E = 100,000 in N/C causes the 5.0 g point charge in FIGURE P22.67 to hang at a 20° angle. What is the charge on the ball? Transcribed Image Text: 120° 5.0 g FIGURE P22.67
Answer Preview: Model The charged ball attached to the string is a p…

, Chapter: 38 -Problem: 55 >> The absorption spectrum of an atom consists of the wavelengths 200 nm, 300 nm, and 500 nm. a. Draw the atom’s energy-level diagram. b. What wavelengths are seen in the atom’s emission spectrum?
Answer Preview: Model Photons are emitted when an atom undergoes a quantum …

, Chapter: 28 -Problem: 4 >> a. What are the magnitude and direction of the current in the 10 ? resistor in FIGURE EX28.4? b. Draw a graph of the potential as a function of the distance traveled through the circuit, traveling cw from V = 0 V at the lower left corner. Transcribed Image Text: ww 10 0 9 V 18 V FIGURE EX28.4
Answer Preview: Model The batteries and the connecting wires are ideal Solve a Choose the current I to be in the clo…

, Chapter: 31 -Problem: 41 >> A 1.0 ?F capacitor is discharged, starting at t = 0 s. The displacement current through the plates is Idisp = (10 A)exp(-t/2.0 ?s). What was the capacitor’s initial voltage (?VC)0?
Answer Preview: Model The displacement current through a c…

, Chapter: 12 -Problem: 78 >> A 10 g bullet traveling at 400 m/s strikes a 10 kg, 1.0-m-wide door at the edge opposite the hinge. The bullet embeds itself in the door, causing the door to swing open. What is the angular velocity of the door just after impact?
Answer Preview: Model For the system the angular momentum is conserved in the collision Visualize Solve As the …

, Chapter: 21 -Problem: 41 >> An ideal refrigerator utilizes a Carnot cycle operating between 0°C and 25°C. To turn 10 kg of liquid water at 0°C into 10 kg of ice at 0°C,(a) How much heat is exhausted into the room(b) How much energy must be supplied to the refrigerator?
Answer Preview: Model We are given T H 298 K and T C 273 K See Figure 21 11 Solve a For a Carno…

, Chapter: 15 -Problem: 68 >> An oscillator with a mass of 500 g and a period of 0.50 s has an amplitude that decreases by 2.0% during each complete oscillation. If the initial amplitude is 10 cm, what will be the amplitude after 25 oscillations?
Answer Preview: Model The oscillator is in simple harmonic motion Solve The …

, Chapter: 33 -Problem: 65 >> Scientists use laser range-finding to measure the distance to the moon with great accuracy. A brief laser pulse is fired at the moon, then the time interval is measured until the “echo” is seen by a telescope. A laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. In order for the reflected light to be bright enough to detect, the laser spot on
Answer Preview: Model The laser light is diffracted by the circular opening of …

, Chapter: 19 -Problem: 7 >> Draw a first-law bar chart (see Figure 19.12) for the gas process in Figure EX19.7.Figure 19.12 Transcribed Image Text: -V FIGURE EX19.7 (a) Isothermal process: AEh = 0 (b) Isochoric process: W = 0 (c) Adiabatic process: Q = 0 Eth i + W + Q = Enf En i + W + Q Enf Ehi + W + Q = Enf 0- Energy that en
Answer Preview: Visualize Solve Because W pdV and this is an isochoric proc…

, Chapter: 8 -Problem: 3 >> FIGURE Q8.3 is a bird€™s-eye view of particles on strings moving in horizontal circles on a tabletop. All are moving at the same speed. Rank in order, from largest to smallest, the tensions Tato Td. Give your answer in the form a > b = c > d and explain your ranking. Transcribed Image Text: 2m ? 2m
Answer Preview: T c T a T d T b Use T …

, Chapter: 9 -Problem: 30 >> A horizontal spring with spring constant 85 N/m extends outward from a wall just above floor level. A 1.5 kg box sliding across a frictionless floor hits the end of the spring and compresses it 6.5 cm before the spring expands and shoots the box back out. How fast was the box going when it hit the spring?
Answer Preview: Model Assume the box is a particle Visualize Use the workkineti…

, Chapter: 10 -Problem: 16 >> A stretched spring stores 2.0 J of energy. How much energy will be stored if the spring is stretched three times as far?
Answer Preview: Model Assume the spring is ideal and obeys Hookes law Then the potential en…

, Chapter: 20 -Problem: 27 >> The rms speed of the atoms in a 2.0 g sample of helium gas is 700 m/s. What is the thermal energy of the gas?
Answer Preview: Model For a gas the thermal energy is the total kinetic ene…

, Chapter: 23 -Problem: 51 >> A parallel-plate capacitor has 2.0 cm × 2.0 cm electrodes with surface charge densities ±1.0 × 10-6 C/m2. A proton traveling parallel to the electrodes at 1.0 × 106 m/s enters the center of the gap between them. By what distance has the proton been deflected sideways when it reaches the far edge of the capacitor? Assume the field is uniform inside the capacitor and zero outside the capacitor.
Answer Preview: Model The electric field is uniform inside the capacitor so constant …

, Chapter: 31 -Problem: 1 >> Andre is flying his spaceship to the left through the laboratory magnetic field of FIGURE Q31.1. a. Does Andre see a magnetic field? If so, in which direction does it point?b. Does Andre see an electric field? If so, in which direction does it point? Transcribed Image Text: Andre FIGURE Q31.1
Answer Preview: a Yes up Andre sees the same magnet…

, Chapter: 13 -Problem: 26 >> Three satellites orbit a planet of radius R, as shown in FIGURE EX13.26. Satellites S1and S3have mass m. Satellite S2has mass 2m. Satellite S1orbits in 250 minutes and the force on S1is 10,000 N.a. What are the periods of S2and S3?b. What are the forces on S2and S3?c. What is the kinetic-energy ratio K1/K3for S1and S3? Tr
Answer Preview: Model Model the planet and satellites as spherical masses Solve a The period of a …

, Chapter: 22 -Problem: 35 >> Pennies today are copper-covered zinc, but older pennies are 3.1 g of solid copper. What are the total positive charge and total negative charge in a solid copper penny that is electrically neutral?
Answer Preview: Model Use the charge model Solve The number of moles in the penny is The …

, Chapter: 15 -Problem: 71 >> A 250 g air-track glider is attached to a spring with spring constant 4.0 N/m. The damping constant due to air resistance is 0.015 kg/s. The glider is pulled out 20 cm from equilibrium and released. How many oscillations will it make during the time in which the amplitude decays to e-1 of its initial value?
Answer Preview: Model The motion is a damped oscillation Solve The position of the air …

, Chapter: 4 -Problem: 10 >> Zack is driving past his house in FIGURE Q4.10. He wants to toss his physics book out the window and have it land in his driveway. If he lets go of the book exactly as he passes the end of the driveway, should he direct his throw outward and toward the front of the car (throw 1), straight outward (throw 2), or outward and toward the back of the car (throw 3)? Explain.Figure Q4.10
Answer Preview: Zach should throw his book outward and toward t…

, Chapter: 30 -Problem: 45 >> A 2.0 cm × 2.0 cm square loop of wire with resistance 0.010 ? has one edge parallel to a long straight wire. The near edge of the loop is 1.0 cm from the wire. The current in the wire is increasing at the rate of 100 A/s. What is the current in the loop?
Answer Preview: Model Assume the wire is long enough so we can use the formula for t…

, Chapter: 18 -Problem: 49 >> To determine the mass of neon contained in a rigid, 2.0 L cylinder, you vary the cylinder’s temperature while recording the read

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11 Reviews for Physics for Scientists and Engineers A Strategic Approach with Modern Physics Textbook Questions And Answers