 7.1RCQ: When is energy most evident?
 7.2RCQ: A force sets an object in motion. When the force is multiplied by t...
 7.3RCQ: Cite an example in which a force is exerted on an object without do...
 7.4RCQ: Which requires more work—lifting a 50kg sack a vertical distance o...
 7.5RCQ: Exactly what is it that enables an object to do work?
 7.6RCQ: If both sacks in the question 1 are lifted their respective distanc...
 7.7RCQ: A car is raised a certain distance in a servicestation lift and th...
 7.8RCQ: Two cars are raised to the same elevation on service station lifts...
 7.9RCQ: When is the potential energy of something significant?
 7.10RCQ: When the speed of a moving car is doubled, how much more kinetic en...
 7.11RCQ: Compared with a car moving at some original speed, how much work mu...
 7.12RCQ: If you push a crate horizontally with 100 N across a 10m factory f...
 7.13RCQ: How does speed affect the friction between a road and a skidding tire?
 7.14RCQ: What will be the kinetic energy of a pile driver ram when it underg...
 7.15RCQ: An apple hanging from a limb has potential energy because of its he...
 7.16RCQ: What is the source of energy in sunshine?
 7.17RCQ: What is recycled energy?
 7.18RCQ: Can a machine multiply input force? Input distance? Input energy? (...
 7.19RCQ: If a machine multiplies force by a factor of 4, what other quantity...
 7.20RCQ: A force of 50 N is applied to the end of a lever, which is moved a ...
 7.21RCQ: What is the efficiency of a machine that miraculously converts all ...
 7.22RCQ: If an input of 100 J in a pulley system increases the potential ene...
 7.23RCQ: What is the ultimate source of energy for fossil fuels, dams, and w...
 7.24RCQ: What is the ultimate source of geothermal energy?
 7.25RCQ: Can we correctly say that hydrogen is a new source of energy? Why o...
 7.27TAD: Do as physics instructor Fred Cauthen does and place a tennis ball ...
 7.28PAC: Calculate the work done when a force of 5 N moves a book 1.2 m. (Re...
 7.29PAC: Show that 2.4 J of work is done when a force of 2.0 N moves a book ...
 7.30PAC: Calculate the work done when a 20N force pushes a cart 3.5 m.
 7.31PAC: Calculate the work done in lifting a 500N barbell 2.2 m above the ...
 7.33PAC: Show that about 786 W of power is expended when a 500N barbell is ...
 7.32PAC: Show that 50 W of power is required to give a brick 100 J of PE in ...
 7.34PAC: Show that when a 3.0kg book is lifted 2.0 m its increase in gravit...
 7.35PAC: Show that the gravitational potential energy of a 1000kg boulder r...
 7.36PAC: Show that the kinetic energy of a 1.0kg book tossed across the roo...
 7.38PAC: Show that 24 J of work is done when a 3.0kg block of ice is moved ...
 7.39PAC: Show that a 2,500,000J change in kinetic energy occurs for an airp...
 7.40PAC: Show that a machine that has an input of 100 J and an output of 40 ...
 7.41TAS: The second floor of a house is 6 m above the street level. How much...
 7.42TAS: (a) How much work is done when you push a crate horizontally with 1...
 7.44TAS: Bellyflop Bernie dives from atop a tall flagpole into a swimming p...
 7.43TAS: This question is typical on some driver’s license exams: A car movi...
 7.45TAS: Nellie Newton applies a force of 50 N to the end of a lever, which ...
 7.46TAS: Consider an ideal pulley system. If you pull one end of the rope 1 ...
 7.47TAS: In raising a 5000N piano with a pulley system, the workers note th...
 7.48TAS: In the hydraulic machine shown, you observe that when the small pis...
 7.49TAS: How many watts of power do you expend when you exert a force of 1 N...
 7.50TAS: Emily holds a banana of mass m over the edge of a bridge of height ...
 7.51TAR: The mass and speed of the three vehicles, A, B, and C, are shown. R...
 7.53TAR: The roller coaster ride starts from rest at point A. Rank these qua...
 7.55TAE: Why is it easier to stop a lightly loaded truck than a heavier one ...
 7.56TAE: Why do you do no work on a 25kg backpack when you walk a horizonta...
 7.57TAE: If your friend pushes a lawnmower 4 times as far as you do while ex...
 7.59TAE: Which requires more work: stretching a strong spring a certain dist...
 7.58TAE: Why does one get tired when pushing against a stationary wall when ...
 7.60TAE: Two people who weigh the same climb a flight of stairs. The first p...
 7.61TAE: In determining the potential energy of Tennys drawn bow (Figure 7.9...
 7.62TAE: When a rifle with a longer barrel is fired, the force of expanding ...
 7.63TAE: Your friend says that the kinetic energy of an object depends on th...
 7.64TAE: You and a flight attendant toss a ball back and forth in an airplan...
 7.65TAE: You watch your friend take off in a jet plane, and you on the kinet...
 7.66TAE: When a jumbo jet slows and descends on approach to landing, there i...
 7.67TAE: Explain how “elastic potential energy” dramatically changed the spo...
 7.68TAE: At what point in its motion is the KE of a pendulum bob at a maximu...
 7.69TAE: A physics instructor demonstrates energy conservation by releasing ...
 7.70TAE: Does the International Space Station have gravitational PE? KE? Exp...
 7.71TAE: What does the workenergy theorem say about the speed of a satellit...
 7.72TAE: A moving hammer hits a nail and drives it into a wall. If the hamme...
 7.73TAE: Why does the force of gravity do no work on (a) a bowling ball roll...
 7.74TAE: Why does the force of gravity do work on a car that rolls down a hi...
 7.75TAE: Does the string that supports a pendulum bob do work on the bob as ...
 7.76TAE: A crate is pulled across a horizontal floor by a rope. At the same ...
 7.77TAE: On a playground slide, a child has potential energy that decreases ...
 7.78TAE: Someone wanting to sell you a Superball claims that it will bounce ...
 7.80TAE: Consider a ball thrown straight up in the air. At what position is ...
 7.79TAE: Why can’t a Superball released from rest reach its original height ...
 7.82TAE: Suppose that you and two classmates are discussing the design of a ...
 7.81TAE: Discuss the design of the roller coaster shown in the sketch in ter...
 7.83TAE: When the girl in Figure 7.16 jacks up a car, how can applying so li...
 7.84TAE: What famous equation describes the relationship between mass and en...
 7.85TAE: When the mass of a moving object is doubled with no change in speed...
 7.86TAE: When the velocity of an object is doubled, by what factor is its mo...
 7.87TAE: Which, if either, has greater momentum: a 1 kg ball moving at 2 m/s...
 7.88TAE: A car has the same kinetic energy when traveling north as when it t...
 7.89TAE: If an object’s KE is zero, what is its momentum?
 7.90TAE: If your momentum is zero, is your kinetic energy necessarily zero a...
 7.91TAE: If two objects have equal kinetic energies, do they necessarily hav...
 7.92TAE: Two lumps of clay with equal and opposite momenta have a headon co...
 7.93TAE: Scissors for cutting paper have long blades and short handles, wher...
 7.94TAE: An inefficient machine is said to “waste energy.” Does this mean th...
 7.95TAE: If an automobile were to have a 100% efficient engine, transferring...
 7.96TAE: Your friend says that one way to improve air quality in a city is t...
 7.97TAE: The energy we require to live comes from the chemically stored pote...
 7.98TAD: Discuss whether or not, once used, energy can be regenerated. Is yo...
 7.99TAD: Discuss what international peace, cooperation, and security have to...
 7.100TAD: Consider the identical balls released from rest on Tracks A and B, ...
 7.101TAD: Does a car burn more gasoline when its lights are turned on? Does t...
 7.102TAD: Suppose an object is set sliding, with a speed less than escape vel...
 7.103TAD: The Sun puts out twice as much solar energy in 2 hours as it does i...
 7.104TAD: If a golf ball and a PingPong ball both move with the same kinetic...
 7.105TAD: Running a car’s air conditioner usually increases fuel consumption....
 7.106TAD: Discuss why one should even bother to use a machine if it cannot mu...
 7.107TAD: You tell your friend that no machine can possibly put out more ener...
 7.108TAD: This may seem like an easy question for a physics type to answer: W...
 7.109TAD: Your discussion partner is confused about ideas discussed in Chapte...
 7.110TAD: In the absence of air resistance, a ball thrown vertically upward w...
 7.112TAD: In the pulley system shown, block A has a mass of 10 kg and is susp...
 7.111TAD: You’re on a rooftop and you throw one ball downward to the ground b...
 7.113TAD: Going uphill, the gasoline engine in a gasoline–electric hybrid car...
 7.114TAD: When a driver applies brakes to keep a car going downhill at consta...
 7.115TAD: Does the KE of a car change more when it goes from 10 to 20 km/h or...
 7.116TAD: Can something have energy without having momentum? Explain. Can som...
 7.117TAD: No work is done by gravity on a bowling ball that is resting or mov...
 7.118TAD: Consider a bob attached by a string, a simple pendulum, that swings...
 7.119TAD: Consider a satellite in a circular orbit above Earth’s surface. In ...
 7.120TAD: Consider the swingingballs apparatus. If two balls are lifted and ...
 7.121TAD: To combat wasteful habits, we often speak of “conserving energy,” b...
 7.122TAD: When an electric company can’t meet its customers’ demand for elect...
Solutions for Chapter 7: Conceptual Physics 12th Edition
Full solutions for Conceptual Physics  12th Edition
ISBN: 9780321909107
Solutions for Chapter 7
Get Full SolutionsSince 118 problems in chapter 7 have been answered, more than 209496 students have viewed full stepbystep solutions from this chapter. Conceptual Physics was written by and is associated to the ISBN: 9780321909107. This expansive textbook survival guide covers the following chapters and their solutions. This textbook survival guide was created for the textbook: Conceptual Physics, edition: 12. Chapter 7 includes 118 full stepbystep solutions.

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parallel

any symbol
average (indicated by a bar over a symbol—e.g., v¯ is average velocity)

°C
Celsius degree

°F
Fahrenheit degree