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Two thin discs, each of mass M and radius r meter, are attached as shown in the fig. to form a rigid body. The rotational inertia of this body about an axis perpendicular to the plane of disc B passing through its centre is |
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Answer» The moment of inertia of the disc about the centroidal axis is Mr2/2. The moment of inertia of the disc at A about the axis passing through B is given using parallel axis theorem as Mr2 + M(2R)2 Thus the total moment of inertia of the whole system is given as Mr2/2 + Mr2 /2 + M(2R)2 = 5Mr2. |
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