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Engineering Mechanics

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

Non-reversible
Ideal
Reversible
None of these

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

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Engineering Mechanics
The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is

D/(D - d)
2D/(D - d)
2D/(D + d)
D/(D + d)

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Engineering Mechanics
In ideal machines, mechanical advantage is __________ velocity ratio.

Less than
Greater than
None of these
Equal to

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

ω
ω/r
ω2r
ωr

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

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

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