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Engineering Mechanics

Engineering Mechanics
The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.

Less than
Greater than
None of these
Equal to

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

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Engineering Mechanics
If the gravitational acceleration at any place is doubled, then the weight of a body will be

2g
g
g/2
√2.g

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

Unstable
None of these
Stable
Neutral

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Engineering Mechanics
The acceleration of a particle moving with simple harmonic motion is __________ at the mean position.

Zero
None of these
Minimum
Maximum

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

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

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