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Engineering Mechanics

Engineering Mechanics
The maximum mechanical advantage of a lifting machine is

m
1 / m
1 - m
1 + m

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Engineering Mechanics
The angular velocity (in rad/s) of a body rotating at N revolutions per minute is

πN/60
2πN/60
πN/180
2πN/180

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Engineering Mechanics
The range of projectile (R) on an upward inclined plane is

g. cos² β/2u². sin (α - β). cos α
2u². sin (α + β). cos α/g. cos² β
2u². sin (α - β). cos α/g. cos² β
g. cos² β/2u². sin (α + β). cos α

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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

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

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Engineering Mechanics
On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be

Away from the wall at its upper end
Towards the wall at its upper end
Upwards at its upper end
Downwards at its upper end

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

Downward at its upper end
Upward at its upper end
Towards the wall at its upper end
Away from the wall at its upper end

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