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A string passing over a pulley has a 3.75-kg mass hanging from one end and a...

A string passing over a pulley has a 3.75-kg mass hanging from one end and a 2.75-kg mass hanging from the other end. The pulley is a uniform solid cylinder of radius 4.9 cmcm and mass 0.80 kg.

A) If the bearings of the pulley were frictionless, what would be the acceleration of the two masses?

B) In fact, it is found that if the heavier mass is given a downward speed of 0.25 m/s , it comes to rest in 7.0 s. What is the average frictional torque acting on the pulley?

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