Q.

Two small spheres of masses 10kg and 30 kg are joined by a rod of length 0.5 m and of negligible mass. The M.I of the system about a normal axis through centre of mass of the system is

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a

1.875 kgm2

b

2.45 kgm2

c

0.75 kgm2

d

1.75 kgm2

answer is A.

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Detailed Solution

When two particles of masses m1 and m2 are at a distance d apart, M.O.I. of the system about an axis passing through the COM and perpendicular to the line joining the particles is given by
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Two small spheres of masses 10kg and 30 kg are joined by a rod of length 0.5 m and of negligible mass. The M.I of the system about a normal axis through centre of mass of the system is