The mass of a flywheel is concentrated at its rim

"The mass of a flywheel is concentrated on the rim ". Why ?

A flywheel of mass 25 kg has a radius of 0.2 m . It is making 240 rpm. What is the torque necessary to bring it to rest in 20 s ? If the torque is due to a force applies tangentially on the rim of the wheel, what is the magnitude of the force ? Assume that mass of flywheel is concentrated at its rim.

the flywheel is so constructed that the entire mass of it is concentrated at its rim, because

the flywheel is so constructed that the entire mass of it is concentrated at its rim, because

The flywheel is so constructed that the entire mass of it is concentrated at its aim , because

In a fly wheel, most of the mass is concentrated at the rim ? Explain why.

The mass of an atom is concentrated in its central part called_________.