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Question: 

Calculate the net torque about the axle of the wheel shown in Fig. 8–42. Assume that a friction torque of $0.60 \textrm{ m}\cdot\textrm{N}$ opposes the motion.

Problem 25.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$-1.2 \textrm{ N m}$

Giancoli 7th Edition, Chapter 8, Problem 25

(2:23)