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what is the resistance of a rotating body to changes in angular
velocity called?
a. axis of rotation
b. rotational inertia
c. torque

The resistance of a rotating body to changes in angular velocity called rotational inertia

Option B

Explanation:

The rotational inertia of a rotating object resist the changes in the angular velocity of the object.  Whenever we try to reduce the velocity of a rotating object or try to stop its motion, we feel a force or kind of resistance in its nature.

This is because an object which rotates through an axis follows the law of inertia exerting a resistance against the external force which tries to change its motion or simply the angular velocity.

Heavier bodies have more rotational inertia as compared to the lighter ones because of its mass. This kind of inertia is known as the “Moment of Inertia” formulated as,

Where,

- Moment of Inertia

mi- Mass of the element of the body

- distance of the element of the body from the axis of rotation

found in the nucleus

has mass of one amu