Question

The density of a rod AB increases from A to B. Is it easier to set it in rotation by clamping at A and applying a perpendicular force at B or by clamping at B and applying force at A.. explain

Answer 1

Answer: By clamping at B and applying a force at A.

Explanation:

Since the density of the rod increases from A to B, it's moment of inertia about A will be greater than about B. Thus, applying a force at A with B fixed will reduce the required force.

Answer 2

Answer:

about point B the moment of inertia is less than A

so, it is easier to rotate about point B