Question

2 2.
A disc rotating at 120 rpm stops in 10 sec. with
uniform retardation. How many rotations did it
complete in this time.

Answer 1

$\huge\boxed{Answer}$

In this case, the initial angular velocity of the fan is ω0=0 and the final angular velocity of the fan is ω=100rev/sec.

The total number of revolutions before the fan coming to stop is calculated as follows.

θ=(ω+ω0/2)t=(100+0/2)×(5×60)=15,000rev

Hence, the total number of revolution made before it stops is 15,000rev.

$\huge\mathfrak\red{itz\:jyotsana☺}$