When a disc rotates with uniform angular velocity, which of the following is not true ?

Options

A. The sense of rotation remains same
B. The orientation of the axis of rotation remains same
C. The speed of rotation is non-zero and remains same
D. The angular acceleration is non-zero and remains same

Answer

D

Explanation

We know that angular acceleration `alpha= (d omega)/(dt)`, given `omega`= constant
where `omega` is angular velocity of the disc
`rArr alpha= (d omega)/(dt)= (0)/(dt)= 0`
Hence, angular acceleration is zero.