Q.
The moment of inertia of a hollow thick spherical shell of mass M and its inner radius R1 and outer radius R2 about diameter is :
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a
2M5(R 25−R 15)(R 23−R 13)
b
2M3(R 25−R 15)(R 23−R 13)
c
4M5(R 25−R 15)(R 23−R 13)
d
4M7(R 25−R 15)(R 23−R 13)
answer is A.
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Detailed Solution
ρ=M4π3R23-R13 Ishell=2M2R225-2M1R125---(1) M2=ρ4πR233=M4π3R23-R134πR233=MR23R23-R13 lly M1=MR13R23-R13 substituting eqn(1) aand (2) we get Ishell=2MR25-R155R23-R13
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