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Engineering Mechanics

Engineering Mechanics
The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

Q / P
P - Q
P + Q
P / Q

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Engineering Mechanics
In actual machines, mechanical advantage is _________ velocity ratio.

Equal to
Greater than
Less than
None of these

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Engineering Mechanics
The moment of inertia of a sphere of mass 'm' and radius 'r', about an axis tangential to it, is

2mr²/5
7mr²/5
2mr²/3
7mr²/3

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

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Engineering Mechanics
The maximum mechanical advantage of a lifting machine is

1 / m
1 - m
m
1 + m

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Engineering Mechanics
If rain is falling in the opposite direction of the movement of a pedestrian, he has to hold his umbrella

Less inclined when standing
More inclined when standing
More inclined when moving
Less inclined when moving

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