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

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

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Engineering Mechanics
Non-coplanar non-concurrent forces are those forces which

None of these
Do not meet at one point and their lines of action do not lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point but their lines of action lie on the same plane

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