Questions
The radius of a rotating sphere decreases by 2% keeping the mass constant, the change in its rotational kinetic energy?
a
2%
b
1%
c
4%
d
8%
detailed solution
Correct option is C
KEr∝r−2[by keeping angular momentum constant]ΔEE×100%=−2Δrr×100%Rotational KE ↑ ses by 4%.Talk to our academic expert!
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A particle moving in a circular path has an angular momentum of L. If the frequency of rotation is halved, then its angular momentum becomes [Kerala CEE 2013]
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