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Engineering Mechanics

Engineering Mechanics
The maximum mechanical advantage of a lifting machine is

1 / m
m
1 + m
1 - m

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Engineering Mechanics
The acceleration of a body sliding down an inclined surface is

None of these
g tanθ
g sinθ
g cosθ

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Engineering Mechanics
A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act

Downward at its upper end
Upward at its upper end
Perpendicular to the wall at its upper end
Zero at its upper end

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Engineering Mechanics
The skidding away of the vehicle on a level circular path can be avoided if the force of friction between the wheels and the ground is __________ the centrifugal force.

None of these
Less than
Greater than
Equal to

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Engineering Mechanics
In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.

Equal to
Less than
None of these
More than

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Engineering Mechanics
The horizontal range of a projectile (R) is given by

R = u² cosα/g
R = u² sin2α/g
R = u² sinα/g
R = u² cos2α/g

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