Question

At t= 0 a fly wheel is rotating at 50 rpm. A motor gives it a constant angular acceleration of 0.5
rad/s2 until it reaches 100 rpm. the motor is then disconnected. How many revolutions are completed at t= 20 s?
(A) 25 rev
(B) 29 rev
(C) 20 rev
(D) 15 rev​

Answer 1

Answer:

A wheel is rotating about a fixed axis through its centre 300 rpm. A constant torque starts acting on it opposes its motion. Before coming to rest it make 25 complete rotations. If the moment of intertia of the wheel about the axis of rotation is (

π

10

)kgm

2

, the torque (in N-m) acting on it is