Question

a disc of mass 1.0 kg and radius 0.1m is rotating at the rate of 2 rpm about an axis passing through the centre and Normal to its plane:
*what is moment of inertia of the disc about axis of rotation?
* calculate angular momentum
*find its K.E of rotation​

Answer 1

Explanation:

Moment of inertia I=

2

mr

2

=

2

10×0.2

2

=0.2 kgm

2

Angular acceleration α=

I

τ

=

0.2

10

=50 rad/s

2

Initial angular velocity w

i

=0

Using w

f

=w

i

+αt

Or w

f

=0+50×6=300 rad/s.