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If the angular momentum of a body increases by 40% its kinetic energy of rotation increases by: a. 80% b. 20% c. 96% d. None of these

 If the angular momentum of a body increases by 40% its kinetic energy of rotation increases by: 
a. 80% 
b. 20% 
c. 96% 
d. None of these 
 

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2 Answers

Abhishek Kumar
askIITians Faculty 255 Points
9 years ago
It will depend on how the angular momentum has increased, either due to increase in distance or velocity. Only if you know velocity has increased, you can tell the increase, else not.
So, answer should be D
Saurabh Kumar
askIITians Faculty 2400 Points
9 years ago
Use K.E. = L2/2I
Use this equation for two conditions (initial and final,i.e. increse in 40% of angular momentum).
Find relative change in Kinetic energy.

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