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**1. A wheel free to rotate about its axis that is not frictionless is initially at rest. A constant external torque of +52 N m is applied to the wheel for 22 s, giving the wheel an angular velocity of +530 rev/min. The external torque is then removed, and the wheel comes to rest 120 s later. (Include the sign in your answers.)**

(a) Find the moment of inertia of the wheel.

(b) Find the frictional torque, which is assumed to be constant.

I have no idea where to begin with this... I need a mass and radius to find the moment of inertia.....but they aren't given.

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