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CBSE - XI Science - Physics - System of Particles and Rotational Motion

two disk have same mass and thickness.their material are of densities p1 & p2.the ratio of moment o inertia is-

Asked by Kushagra Patrikar 24th September 2013, 10:40 PM
Answered by Expert


Let the mass of both discs be M. Let radius of one disk be R1 and that of the other be R2. Let their thickness be h.
The disc is of cylindrical shape. So, its volume is
Now, the moment of inertia of disc of mass M and radius R along the axis perpendicular to disc at centre is
The density of disc is
Thus, the ratio of moment of inertia is:
Answered by Expert 25th September 2013, 9:45 AM

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