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Engineering Mechanics

Engineering Mechanics
If the gravitational acceleration at any place is doubled, then the weight of a body will be

g
√2.g
2g
g/2

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Engineering Mechanics
The maximum acceleration of a particle moving with simple harmonic motion is

ω²r
ω/r
ωr
ω

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Engineering Mechanics
The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)

t = g cos β/2u sin (α + β)
t = 2u sin (α - β)/g cos β
t = g cos β/2u sin (α - β)
t = 2u sin (α + β)/g cos β

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Engineering Mechanics
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Upwards at its upper end
Perpendicular to the wall at its upper end
Zero at its upper end
Downwards at its upper end

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Engineering Mechanics
The efficiency of a lifting machine is the ratio of

Output to the input
All of these
Work done by the machine to the work done on the machine
Mechanical advantage to the velocity ratio

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

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

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