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Two discs of same thickness but of diffe...

Two discs of same thickness but of different radii are made of two different materials such that their masses are same. The densities of the materials are in the ratio of `1 : 3.` The moments of inertia of these discs about the respective axes passing through their centres and perpendicular to their planes will be in the ratio of

A

`1:3`

B

`3:1`

C

`1:9`

D

`9:1`

Text Solution

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The correct Answer is:
B
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ERRORLESS -ROTATIONAL MOTION-Practice Problems (Problems based on moment of inertia)
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  10. One quarter sector is cut from a uniform circular disc of radius R. Th...

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  11. Two discs of same thickness but of different radii are made of two dif...

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  12. A thin wire of length L and uniform linear mass density rho is bent in...

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  13. If a solid sphere and solid cylinder of same mass and radius rotate ab...

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  14. Two point masses of 0.3 kg and 0.7kg are fixed at the ends of a rod of...

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  15. A circular disc A of radius r is made from an iron plate of thickness ...

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  16. A thin wire of length l and mass m is bent in the form of a semicircle...

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  17. If l(1) is the moment of inertia of a thin rod about an axis perpendic...

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  18. Four solids are shown in cross section. The sections have equal height...

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  19. The moment of inertia l of a solid sphere having fixed volume depends ...

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  20. A thin rod of length L of mass M is bent at the middle point O at an a...

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