Question: Consider a 10 kg block of wood attached to a friction-less pivot point on a flat horizontal surface. The length of the light rigid rod which attaches the block to the pivot is 1.5 m long. If a 40 g bullet is fired into the block, such that it embeds itself and the two moves together after, the bullet-block system is observed to swing through half of a circle before coming to rest.
Part I: What is the coefficient of kinetic friction between the block and the surface?
Please explain how you came to your conclusion. Thanks.