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**1. Homework Statement**

A 12 kg mass is attached to a cord that is wrapped around a wheel of radius r = 10 cm (Fig. 8.20). The acceleration of the mass down the friction-less incline is 2.0 m/s^2/. Assuming the axle of the wheel to be friction-less, determine (a) the tension in the cord, (b) the moment of inertia of the wheel , and (c) the angular speed of the wheel 2 s after it begins rotating, starting from rest.

**2. Homework Equations**

F = ma

**3. The Attempt at a Solution**

I found the tangential force by using F = ma and found it to be 24. I am not sure how to continue to find the angular acceleration and moment of inertia because the question doesn't give the mass of the wheel.