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

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

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Engineering Mechanics
The static friction

Always acts in a direction, opposite to that in which the body tends to move
All of these
Bears a constant ratio to the normal reaction between the two surfaces
Is independent of the area of contact, between the two surfaces

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