Explanation Given data: A child slides down a rope at a playground. Mass of the child ( m ) is 40 kg. The distance slide down the child ( h ) is 2.0 m. Formula used: From the given data, the thermal energy created by the child is equal to the loss in the potential energy. Therefore, write the expression for thermal energy created by the child as follows. Δ E thermal = U (1) Here, U is the loss in the potential energy. Write the expression for loss in the potential energy as follows. U = m g h (2) Here, g is the acceleration due to gravity of the earth, which is 9.8 m s 2 , and h is the distance descended by the child (height). Explanation: Calculation of thermal energy created by the child ( Δ E thermal ) : From equation (2), substitute m g h for U in equation (1), Δ E thermal = m g h Substitute 40 kg for m , 9

College Physics: A Strategic Approach (4th Edition)

4th Edition

ISBN: 9780134609034

Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field

Publisher: PEARSON

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Question

Chapter 10, Problem 32P

To determine

To find: The thermal energy created by the child as she slides down the rope.

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Chapter 10, Problem 31P

Chapter 10, Problem 33P

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Cam mechanisms are used in many machines. For example, cams open and close the valves in your car engine to admit gasoline vapor to each cylinder and to allow the escape of exhaust. The principle is illustrated in the figure below, showing a follower rod (also called a pushrod) of mass m resting on a wedge of mass M. The sliding wedge duplicates the function of a rotating eccentric disk on a camshaft in your car. Assume that there is no friction between the wedge and the base, between the pushrod and the wedge, or between the rod and the guide through which it slides. When the wedge is pushed to the left by the force F, the rod moves upward and does something such as opening a valve. By varying the shape of the wedge, the motion of the follower rod could be made quite complex, but assume that the wedge makes a constant angle of 0 = 15.0°. Suppose you want the wedge and the rod to start from rest and move with constant acceleration, with the rod moving upward 1.00 mm in 8.00 ms. Take m…

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Chapter 10 Solutions

College Physics: A Strategic Approach (4th Edition)

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