Question

Calculate the moment of inertia of a hollow sphere of inner and outer diameter 1m and 0.5 m respectively about a (a) diameter and (b) about a tangent. Mass of hollow sphere is 5 kg. ii) A fly wheel of mass 100kg and radius 0.5m makes 10 revolutions per second. Calculate angular velocity and moment of inertia

Answer 1

Answer:

The string provides a torque on the flywheel. We have torque as τ=Iα.

Thus

Fr=Iα

or

10×0.2=0.4×α

or

α=5rad/s2

Thus after 4 second