Engineering Mechanics
The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is

mr²/6
mr²/8
mr²/4
mr²/2

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Engineering Mechanics
For any system of coplanar forces, the condition of equilibrium is that the

Algebraic sum of the horizontal components of all the forces should be zero
Algebraic sum of the vertical components of all the forces should be zero
All of these
Algebraic sum of moments of all the forces about any point should be zero

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