Torque equations:

$\overline{){\mathbf{\tau}}{\mathbf{=}}{\mathbf{r}}{\mathbf{F}}{\mathbf{s}}{\mathbf{i}}{\mathbf{n}}{\mathbf{\theta}}}$ where θ is the angle between r and F.

The tension and the radius are perpendicular. Thus, θ = 90°.

What is the magnitude of the net torque on the pulley about the axle?

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