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Engineering Mechanics

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

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

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Engineering Mechanics
The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (α) is

45° + β/2
60° + β/2
β/2
30° + β/2

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Engineering Mechanics
In order to completely specify angular displacement by a vector, it must fix

All of these
Magnitude of angular displacement
Sense of angular displacement
Direction of the axis of rotation

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Engineering Mechanics
A smooth cylinder lying on its convex surface remains in __________ equilibrium.

Unstable
None of these
Neutral
Stable

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Engineering Mechanics
A body of mass ‘m’ moving with a constant velocity ‘v’ strikes another body of same mass moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is

v
8v
2v
4v

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Engineering Mechanics
An ideal machine is one whose efficiency is

1
Between 70 and 80%
Between 60 and 70 %
Between 80 and 90%

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