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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

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a
1.875 kgm2
b
2.45 kgm2
c
0.75 kgm2
d
1.75 kgm2

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detailed solution

Correct option is A

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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Three point masses, each of m, are placed at the corners of an equilateral triangle of side l. Then the moment of inertia of this system about an axis along one side of the triangle is


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