Q.

The moment of inertia of a door of mass m, length 2l and width l about its longer side is

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a

11ml224

b

5ml224

c

ml23

d

none of these

answer is C.

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Detailed Solution

About YY′=ml212Using parallel axis theorem,I( about AD)=ml212+ml24=ml23
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The moment of inertia of a door of mass m, length 2l and width l about its longer side is