GENERAL KNOWLEDGE

GK

PHYSICS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

What will happen to an object’s moment of inertia if its mass is tripled while its distance from the axis of rotation remains unchanged?

A	It will be tripled.
B	It will be 1/3 its initial value
C	It will stay the same.
D	It will become zero.

Explanation:

Detailed explanation-1: -From the above expression, the Moment of inertia will increase with the increased distance of the mass from the axis of rotation.

Detailed explanation-2: -For a given rotation axis direction, the moment of inertia will always be minimized when the axis of rotation passes through the object’s center-of-mass. The moment of inertia increases as the rotation axis is moved further from the center-of-mass.

Detailed explanation-3: -The rotational inertia of the body differs about each axis. The human body has three principal axes of rotation. Rotational inertia is least about the longitudinal axis, which is the vertical head-to-toe axis, because most of the mass is concentrated along this axis.

Detailed explanation-4: -Since the mass is closer to the axis of rotation, the moment of inertia will decrease.

There is 1 question to complete.