A coin moves in a circular path in a rough rotating horizontal surface which has an angular acceleration alpha

A coin moves in a circular path in a rough rotating horizontal surface

1.	A coin moves in a circular path in a rough rotating horizontal surface which has an angular acceleration alpha
Answer» power delivered by the friction on the coin is positive. power delivered by centripetal force on the particle is zero. work done by the contacting frictional force on the SYSTEM (disc + surface) is negative. Tangential acceleration of the coin is directly PROPORTIONAL to the RATE at which the power is being delivered by the EXTERNAL agent. Answer :A::B