Question

A uniform disk rotating with constant acceleration covers 50 revolutions in first 5 seconds.Calculate the angular acceleration and angular velocity at end of 5second?

Answer 1

I don't know...... .....

Answer 2

One revolution =
$2\pi$
rads.
If it finishes 50 revs in 5 secs then it does 10 in 1 sec .

So the angular displacement is
$10 \times 2\pi \: rads$
$= 20\pi \: rads$
Now
$displ = 0.5 \times accl \times (time) {?}^{2}$
(Considering that the body is initially at rest)

Plug in displacement and time and u will get that acceleration =
$8\pi \div 25$