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One end of a thin uniform rod of length 2L and mass M1 is rivetted to the centre of a uniform circular disc of radius 'r' and mass M2 so that both are coplanar. The centre of mass of the combination from the centre of the disc is (Assume that the point of attachment is at the origin)

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a

L(M1+M2)2M1

b

M1LM1+M2

c

2(M1+M2)LM1

d

2LM1(M1+M2)

answer is B.

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Detailed Solution

d=2L2=L x cm=M1dM1+M2=M1LM1+M2

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One end of a thin uniform rod of length 2L and mass M1 is rivetted to the centre of a uniform circular disc of radius 'r' and mass M2 so that both are coplanar. The centre of mass of the combination from the centre of the disc is (Assume that the point of attachment is at the origin)