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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.

Figure 8-42.

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 

$-1.2 \textrm{ N m}$

Giancoli 7th Edition, Chapter 8, Problem 25



Hello Mr. Dychko, the units your are using resemble those for energy, N*m. The units for torque are reversed, m*N.

Hi barnettlenworth, thank you for the comment. You're quite right that Netwtons times meters makes units of energy - Joules. However, it's nevertheless typical to write units of torque as $\textrm{N}\cdot \textrm{m}$, and it's understood that since $\textrm{J}$ isn't used instead, that $\textrm{N}\cdot \textrm{m}$ represents torque.