The 22-cm-diameter disk in the figure below can rotate on, Ask an Expert

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The 22-cm-diameter disk in the figure below can rotate on an axle through its center. What is the net torque about the axle if F = 20 N?

If we consider the counterclockwise as the positive direction of motion, I got -1.02. However, for some reason, the website keeps telling me that my answer is wrong. I dont know why.

697_The 22-cm-diameter disk.png

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