78 At a certain factory, 300 kg crates are dropped vertically from a packing machine onto a conveyor belt moving at 1.20 m/s (Fig. 8-64). (A motor maintains the belt's con- stant speed.) The coefficient of ki- FRAGLE netic friction between the belt and each crate is 0.400. After a short Figure 8-64 Problem 78. time, slipping between the belt and the crate ceases, and the crate then moves along with the belt. For the period of time during which the crate is being brought to rest relative to the belt, calculate, for a coordinate system at rest in the factory, (a) the kinetic energy supplied to the crate, (b) the magnitude of the kinetic frictional force acting on the crate, and (c) the energy supplied by the motor. (d) Explain why answers (a) and (c) differ.

78 At a certain factory, 300 kg crates are dropped vertically from a packing machine onto a conveyor belt moving at 1.20 m/s (Fig. 8-64). (A motor maintains the belt's con- stant speed.) The coefficient of ki- FRAGLE netic friction between the belt and each crate is 0.400. After a short Figure 8-64 Problem 78. time, slipping between the belt and the crate ceases, and the crate then moves along with the belt. For the period of time during which the crate is being brought to rest relative to the belt, calculate, for a coordinate system at rest in the factory, (a) the kinetic energy supplied to the crate, (b) the magnitude of the kinetic frictional force acting on the crate, and (c) the energy supplied by the motor. (d) Explain why answers (a) and (c) differ.

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

78 At a certain factory, 300 kg
crates are dropped vertically from
a packing machine onto a conveyor
belt moving at 1.20 m/s (Fig. 8-64).
(A motor maintains the belt's con-
stant speed.) The coefficient of ki-
FRAGLE
netic friction between the belt and
each crate is 0.400. After a short
Figure 8-64 Problem 78.
time, slipping between the belt and
the crate ceases, and the crate then moves along with the belt. For
the period of time during which the crate is being brought to rest
relative to the belt, calculate, for a coordinate system at rest in
the factory, (a) the kinetic energy supplied to the crate, (b) the
magnitude of the kinetic frictional force acting on the crate, and
(c) the energy supplied by the motor. (d) Explain why answers
(a) and (c) differ.

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