#10 | Moment of Inertia (MI): Introduction
(Physics) > Systems of Particles and Rotational Motion
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Three-point masses 'm' each, are placed at the vertices of an equilateral triangle of side a. Moment of inertia of the system about axis COD is-

1. 2ma2

2. 23ma2

3. 54ma2

4. 74ma2

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One solid sphere A and another hollow sphere B are of same mass and same outer radii. Their moment of inertia about their diameters are respectively IA and IB such that

1. IA=IB

2. IA>IB

3. IA<IB

4. IAIB=dAdB

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A particle of mass 1 kg is kept at (1m, 1m, 1m). The moment of inertia of this particle about z-axis would be

1.  1 kg-m2

2.  2 kg-m2

3.  3 kg-m2

4.  None of these

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One quarter sector is cut from a uniform circular disc of radius R.  This sector has mass M.  It is made to rotate about a line perpendicular to its plane and passing through the centre of the original disc.  Its moment of inertia about the axis of rotation is [IIT-JEE (Screening) 2001]

(1) 12MR2

(2) 14MR2

(3) 18MR2

(4) 2MR2

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The radius of gyration of a uniform rod of length L about an axis passing through its centre of mass is

1. L23

2. L212

3. L3

4. L2

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