Calculating rotational work.

1. The problem statement, all variables and given/known data

Calculate the work done on a solid cylinder of mass 5.0 kg and radius 55.6 cm by an applied force of 12.2N if it turns 45 degrees.

2. Relevant equations

W = torque x angle (radians)

3. The attempt at a solution

I just used:

W = torque x angle
= Force x perpendicular radius x angle
= 12.2 x 55.6 x pi/4

Why is this wrong? I think it’s wrong, because part b of the question asks how the answer would change if the object was a ring.

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