A pulley consisting of two parts (an inner portion 5-cm in radius and an outer part 10-cm in radius) is attached to two blocks as shown below. Note that the coefficients of friction between the 3-kg block and the horizontal surface that it rests on are listed and that the moment of inertia of the pulley is 0.04-kg m2 . a. If the system is released from rest, what will be the acceleration of each block? b. How long will it take the pulley to make 20 rotations? c. Assuming you could start the problem over and change the mass of the 3-kg block, to what minimum value would you need to change the mass to so that the system did not move?

The pulley has an inner/outer radius of 5cm and 10cm; its moment of inertia is 0.04-kg m2