Question

Assertion : Two identical solid spheres are rotated frm rest to same angular velocity `omega` about two different axes as shown in figure. More work will have to be done to rotate the sphere in case-2
Reason : Moment of inertia is case-2 is more.

A. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion
B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
C. If Assertion is true but Reason is fasle
D. If Assertion is false but Reason is true

Answer 1

Correct Answer - A
Moment of inertia of sphere in case 1 is `(2)/(5) MR^(2)`
Moment of inertia of sphere is case 2 is `(7)/(5) MR^(2)`
So, more work will have to be done to rotate the sphere in case 2.