19. 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 remains same. (d) The angular acceleration is non-zero and remains same.
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Answer: D
As disc is rotating with uniform angular velocity, ω is constant.
Therefore
Angular acceleration=α
= dw/dt (Differentiation of constant is 0)
= 0
So, its angular acceleration is zero.
Hence, option d is correct answer.
Explanation:
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