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1. The moment of inertia of elliptic disc of area 2a and 2b of mass m about the area 2a is 1... 1/4mb^3 2... 1/4mb^4 3.... 1/4mb^5 4.... 1/4mb^2 2. the moment of inertia of circular plate of radius a mass m about its diameter? 1... 1/4ma^3 2... 1/4ma^4 3... 1/4ma^2 4... 1/4ma^5 |
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Answer» wer:we know that the moment of inertia of an circlar disc of uniform mass distribution of mass 'm', radius 'r' about its axis is 2mr 2 Since, For an ELLIPTICAL disc of uniform mass distribution of mass 'm', semi major axis 'r', mass distribution is CLOSER to axis so its moment of inertia will be less than 2mr 2 .THEREFORE, D is CORRECT option.2 )We know moment of inertia of a disc ,axis passing through its diameter is I=mr 2 /4 Moment of inertia of ring about its axis passing through diameter I 1 =mr 2 /2=2INow using perpendicular axis theorem I z =I x +I y =2I 1 =4IStep-by-step EXPLANATION: |
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