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Get Full Access to University Physics - 13 Edition - Chapter 7 - Problem 27e
Get Full Access to University Physics - 13 Edition - Chapter 7 - Problem 27e

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# A 10.0-kg box is pulled by a horizontal wire in a circle ISBN: 9780321675460 31

## Solution for problem 27E Chapter 7

University Physics | 13th Edition

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Problem 27E

A 10.0-kg box is pulled by a horizontal wire in a circle on a rough horizontal surface for which the coefficient of kinetic friction is 0.250. Calculate the work done by friction during one complete circular trip if the radius is (a) 2.00 m and (b) 4.00 m. (c) On the basis of the results you just obtained, would you say that friction is a conservative or nonconservative force? Explain.

Step-by-Step Solution:

Solution 27E Step 1: Given data: Mass of a box m = 10 kg Coefficient of kinetic friction between box and rough horizontal surface k = 0.250 Normal force on a box on a rough horizontal surface N = mg N = (10 kg)(9.8) N = 98 N (downward) Kinetic friction force k = k * N k = 0.250 *8 N k = 24.5 N

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