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Engineering Mechanics

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

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

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Engineering Mechanics
The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.

Equal to
Greater than
Less than
None of these

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Engineering Mechanics
If u₁ and u₂ are the velocities of two moving bodies in the same direction before impact and v₁ and v₂ are their velocities after impact, then coefficient of restitution is given by

(v₂ - v₁)/(u₁ - u₂)
(u₁ - u₂)/(v₁ - v₂)
(v₁ - v₂)/(u₁ - u₂)
(u₂ + u₁)/(v₂ + v₁)

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Engineering Mechanics
The coefficient of friction depends upon

Shape of the surfaces
Area of contact
Nature of surfaces
All of these

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Engineering Mechanics
The maximum acceleration of a particle moving with simple harmonic motion is

ωr
ω²r
ω/r
ω

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Engineering Mechanics
A differential pulley block has larger and smaller diameters of 100 mm and 80 mm respectively. Its velocity ratio is

10
20
40
5

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