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Engineering Mechanics

Engineering Mechanics
A screw jack used for lifting the loads is

A reversible machine
None of these
An ideal machine
A non-reversible machine

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Engineering Mechanics
During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.

Less than
Greater than
Equal to
Equal and opposite to

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Engineering Mechanics
The friction experienced by a body, when at rest, is known as

Limiting friction
Coefficient of friction
Static friction
Dynamic friction

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Engineering Mechanics
When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ to its acceleration.

Cube root
None of these
Inversely proportional
Directly proportional

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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

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

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Engineering Mechanics
The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion, and y = Displacement of the particle from mean position.)

ω².√(r² - y²)
ω².√(y² - r²)
ω.√(y² - r²)
ω.√(r² - y²)

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