Q.

From a disc of mass ' m 'and radius ' r ' a circular portion of radius r3 is removed from the edges. Find the M.I of the remaining system about a normal through centre of original disc

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a

94mr2

b

4mr29

c

32mr2

d

23mr2

answer is C.

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Detailed Solution

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Let I2 be the M.I of remaining portion, M.I of the removed portion about a normal axis through centre of the original disc is
I1=m9r322+m92r32I1=mr218I2=II1=mr22mr218I2=4mr29

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