Questions
A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated, uniformly to raise its temperature slightly
a
its speed of rotation increases
b
its KE of rotation decreases
c
its speed of rotation remains same
d
its speed increases because its moment of inertia increases.
detailed solution
Correct option is B
As externl torque is zero, angular momentum (L) of the rod remains conserved. Now I = 1/12 ml² and KE = L²/2IDue to thermal expansion, l increases, so KE decreases.Talk to our academic expert!
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A rotating solid metal sphere is heated by . If then percentage change in its moment of inertia is
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