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Engineering Mechanics

Engineering Mechanics
If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys.

Third
None of these
First
Second

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

Acceleration
None of these
Velocity
Momentum

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Engineering Mechanics
The velocity ratio in case of an inclined plane inclined at angle 'θ' to the horizontal and weight being pulled up the inclined plane by vertical effort is

cosθ
cosecθ
tanθ
sinθ

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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.

Equal to
Less than
Greater than
Equal and opposite to

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Engineering Mechanics
The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)

n
2n - 1
2n
n²

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Engineering Mechanics
If a number of forces are acting at a point, their resultant is given by

(∑V)2 + (∑H)2
(∑V)2 +(∑H)2 +2(∑V)(∑H)
√[(∑V)2 +(∑H)2 +2(∑V)(∑H)]
√[(∑V)2 + (∑H)2]

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