Question

A disc of circumference `s` is at rest at a point `A` on a horizontal surface when a constant horizontal force begins to act on its centre. Between `A` and `B` there is sufficient friction toprevent slipping, and the surface is smooth to the right of `B.AB = s`. The disc moves from `A` to `B` in time `T`. To the right of `B`,
.
A. the angular acceleration of the disc will disappear, linear acceleration will remain unchanged
B. linear acceleration of the disc will increase
C. the disc will make one rotation in time T/2
D. the disc will cover a distance greater then s in further time T.

Answer 1

Correct Answer - A
To the right of B the friction force will disppear so `alpha=0`, linear acc. Increases so disc cover distance greater than s in time T to the right of B the `omega` is maximum and in `T//2` one revolution will complete