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Engineering Mechanics

Engineering Mechanics
The angle between two forces when the resultant is maximum and minimum respectively are

90° and 180°
180° and 0°
90° and 0°
0° and 180°

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Engineering Mechanics
The time of flight (t) of a projectile on a horizontal plane is given by

t = 2u. cosα/g
t = 2u. sinα/g
t = 2u/g.sinα
t = 2u. tanα/g

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

None of these
Neutral
Unstable
Stable

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Engineering Mechanics
The resultant of two equal forces ‘P’ making an angle ‘θ’, is given by

2P cosθ/2
2P cotθ/2
2P sinθ/2
2P tanθ/2

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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

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

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Engineering Mechanics
Efficiency of a screw jack is given by (where α = Helix angle, and φ = Angle of friction.)

tan(α + φ)/tanα
tanα/tan (α + φ)
None of these
tan(α - φ)/tanα

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