6 In Fig. 8-23a, you pull upward on a rope that is attached to a cylinder on a vertical rod. Because the cylinder fits tightly on the rod, the cylinder slides along the rod with considerable friction. Your force does work W = +100 J on the cylinder-rod-Earth system (Fig. 8-23b). An “energy statement" for the system is shown in Fig. 8-23c: the kinetic energy K increases by 50 J, and the gravita- tional potential energy U, increases by 20 J. The only other change in energy within the system is for the thermal energy Eth. What is the change AE? Rod Work W Rope W= +100 J System's energies: !System AK = +50 J Cylinder AU = +20 J AEh = ? Earth (a) (6) (c)

6 In Fig. 8-23a, you pull upward on a rope that is attached to a cylinder on a vertical rod. Because the cylinder fits tightly on the rod, the cylinder slides along the rod with considerable friction. Your force does work W = +100 J on the cylinder-rod-Earth system (Fig. 8-23b). An “energy statement" for the system is shown in Fig. 8-23c: the kinetic energy K increases by 50 J, and the gravita- tional potential energy U, increases by 20 J. The only other change in energy within the system is for the thermal energy Eth. What is the change AE? Rod Work W Rope W= +100 J System's energies: !System AK = +50 J Cylinder AU = +20 J AEh = ? Earth (a) (6) (c)

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

6 In Fig. 8-23a, you pull upward on a rope that is attached to a
cylinder on a vertical rod. Because the cylinder fits tightly on the
rod, the cylinder slides along the rod with considerable friction.
Your force does work W = +100 J on the cylinder-rod-Earth
system (Fig. 8-23b). An “energy statement" for the system is shown
in Fig. 8-23c: the kinetic energy K increases by 50 J, and the gravita-
tional potential energy U, increases by 20 J. The only other change
in energy within the system is for the thermal energy Eth. What is
the change AE?
Rod
Work W
Rope
W= +100 J
System's energies:
!System
AK = +50 J
Cylinder
AU = +20 J
AEh = ?
Earth
(a)
(6)
(c)

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