Engineering Mechanics
The periodic time of one oscillation for a simple pendulum is (where l = Length of the pendulum.)

2π. √(l/g)
(1/2π). √(g/l)
None of these
(1/2π). √(l/g)

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

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

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