2nd Edition

ISBN: 9780134605500

Author: ETKINA

Publisher: PEARSON CO

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A machine is a device that accepts energy in some available form and utilizes it to do a type of work. Energy, work, or power has to be transferred from one mechanical part to another to run a machine. While the transfer of energy between two machine par…

Kinetic Energy and Work-Energy Theorem

In physics, work is the product of the net force in direction of the displacement and the magnitude of this displacement or it can also be defined as the energy transfer of an object when it is moved for a distance due to the forces acting on it in the d…

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Textbook Question

Chapter 7, Problem 74GP

74 * EST A “gravity force car” is powered by the force exerted by Earth on an object of mass M. The object is tied to a rope that is turning the axle of the rear wheels, as shown in Figure P7.74 The mass of the car (excluding the hanging object) is m. As the car accelerates, the object descends a distance h. (a) Ignoring air resistance and friction in the pulley and wheels, derive an expression for the final speed of the car. (b) Based on your answer to part (a), what would you suggest to the designers of such a car if the goal is to achieve the greatest final speed? (c) Estimate the maximum final speed of a tabletop version of a gravity force car (think of reasonable values for the variables in the equation that you derived).¹

1 This problem was inspired by Gordon Aubrecht, who sadly passed away in 2016.

Chapter 7, Problem 74GP, 74 * EST A “gravity force car” is powered by the force exerted by Earth on an object of mass M. The

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Chapter 7, Problem 73GP

Chapter 7, Problem 75GP

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Chapter 7 Solutions

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