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Engineering Mechanics

Engineering Mechanics
The rate of change of displacement of a body is called

Velocity
Momentum
Acceleration
None of these

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Engineering Mechanics
In order to double the period of simple pendulum, the length of the string should be

Halved
Doubled
Quadrupled
None of these

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Engineering Mechanics
The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)

P = mW - C
P = C - mW
P = mW + C
P = m/W + C

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Engineering Mechanics
The centre of percussion is below the centre of gravity of the body and is at a distance equal to

kG2/h
h/kG
h × kG
h2/kG

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Engineering Mechanics
The maximum height of a projectile on a horizontal plane, is

u² sin²α/g
u² cos²α/2g
u² cos²α/g
u² sin²α/2g

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Engineering Mechanics
A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Away from the wall at its upper end
Towards the wall at its upper end
Downward at its upper end
Upward at its upper end

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