Two objects are attached to ropes that are attached to two wheels on a common axle, as shown in Figure 9-60. The two wheels are attached. together so that they form a single rigid object. The moment of inertia of the rigid object is 40 kg-m². The radii or the wheels are R? = 1.2 m and R? = 0.40 m. (a) If m? = 24 kg, find my such that there is no angular acceleration of the wheels. (b) If 12 kg is placed on top of my, find the angular acceleration of the wheels and the tensions (in kN) in the ropes.