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Q.

Two rotating bodies  A and  B of masses m,2m with moments of inertia lA andIB ( IB>IA) have equal kinetic energy of rotation. If LA and LB be their angular momenta respectively, then 

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a

LA=LB2

b

LA=2LB

c

LB>LA

d

LB<LA

answer is C.

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Detailed Solution

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 Here, mA=m,mB=2m

 Both bodies A and B have equal kinetic energy of rotation 

kA=kB12IAωA2=12IBωB2

ωA2ωB2=IBIA…………(1)

Ratio of angular momenta, 

LALB=IAωAIBωB=IAIB×IBIA   [Using eqn. 

=IAIB<1  IB>IALB>LA

 

 

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