Question

Part A)

A potter's wheel—a thick stone disk of radius 0.400 m and mass 138 kg—is freely rotating at 60.0 rev/min. The potter can stop the wheel in 5.00 s by pressing a wet rag against the rim and exerting a radially inward force of 58.9N. Find the effective coefficient of kinetic friction between the wheel and rag.

Part B)

The net work done in accelerating a solid cylindrical wheel from rest to an angular speed of 50rev/ min is W=590J. If the radius of the wheel is 1.10m, what is its mass?

Part C)

A hollow sphere of mass 1.85 kg and radius 0.135 m rolls without slipping at a speed of 5.15 m/s toward an inclined plane, which is tilted θ= 24.6 degrees above horizontal. The ball rolls up the incline plane, again without slipping. How far does the ball go up the plane (L) before it comes to a stop? Note that not all variables may be needed to solve this problem (this is a model for the game skee ball).

Answer 1