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Engineering Mechanics

Engineering Mechanics
The unit of work in S.I. units is

Newton
kg-m
erg
joule

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Engineering Mechanics
A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

P = W (sinα + μcosα)
P = W tanα
P = W (cosα + μsinα)
P = W tan (α + φ)

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

Zero at its upper end
Downwards at its upper end
Upwards at its upper end
Perpendicular to the wall at its upper end

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Engineering Mechanics
The ratio of static friction to dynamic friction is always

None of these
Less than one
Greater than one
Equal to one

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Engineering Mechanics
The law of motion involved in the recoil of gun is

Newton's first law of motion
Newton's third law of motion
Newton's second law of motion
None of these

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Engineering Mechanics
The range of projectile on a downward inclined plane is ________ the range on upward inclined plane for the same velocity of projection and angle of projection.

Less than
Equal to
More than
None of These

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