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

Options

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

Answer

D

Explanation

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