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Q.

If a solid sphere of mass 5kg and a disc of mass 4kg have the same radius. Then the ratio of moment of inertia of the disc about a tangent in its plane to the moment of inertia of the sphere about its tangent will be x/7. Then the value of x is ……

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answer is 5.

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Detailed Solution

For disc about a tangent in its plane
Id=54m1R2=54×4R2=5R2
For solid sphere about tangent
Id=75m2R2=75×5R2=7R2
IdIs=57=5

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