Question

When a disc rotates with uniform angular velocity, which of the following is not true ?
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 remain same.
D. the angular acceleration is zero.

Answer 1

Correct Answer - D
We know that angular acceleration `alpha=(domega)/(dt)` given `omega`=const.
Where `omega` is angular velocity of the disc
`rArralpha=(domega)/(dt)=0/(dt)=0` Hence, angular acceleration is zero