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Engineering Mechanics

Engineering Mechanics
If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

None of these
g/2
g/3
g/4

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Engineering Mechanics
The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as

Principle of transmissibility of forces
None of these
Principle of independence of forces
Principle of resolution of forces

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Engineering Mechanics
The law of motion involved in the recoil of gun is

Newton's third law of motion
None of these
Newton's first law of motion
Newton's second law of motion

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Engineering Mechanics
If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

30°
120°
60°
90°

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Engineering Mechanics
A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

Ideal
Non-reversible
Reversible
None of these

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Engineering Mechanics
The linear velocity of a body rotating at ω rad/s along a circular path of radius r is given by

ω².r
ω.r
ω/r
ω²/r

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