Q.

If I1 is the moment of inertia of solid cylinder of radius R and length l about it geometrical axis. A concentric cylinder having radius R2 and lengthl2  is carved off from original cylinder and I2 is MOI of carved off cylinder. Find I1I2.

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answer is 32.

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Detailed Solution

Thus I1I2=32

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MOl of solid cylinder

I1=12mR2

Density =ρ=mv=mπR2l

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I2=m2(R/2)22

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I2=m2(R/2)22

I2=12mπR2l×π(R2)2(l2)(R2)2

Where,m2=mπR2l×π(R2)2l2

I2=12mR232

I1I2=12mR212mR232=321

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If I1 is the moment of inertia of solid cylinder of radius R and length l about it geometrical axis. A concentric cylinder having radius R2 and lengthl2  is carved off from original cylinder and I2 is MOI of carved off cylinder. Find I1I2.