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Engineering Mechanics

Engineering Mechanics
The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is

2D/(D - d)
D/(D + d)
D/(D - d)
2D/(D + d)

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

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

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Engineering Mechanics
A force while acting on a body may

Change its motion
Balance the forces, already acting on it
Give rise to the internal stresses in it
All of these

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Engineering Mechanics
The forces, which meet at one point, but their lines of action do not lie in a plane, are called

Non-coplanar concurrent forces
Coplanar non-concurrent forces
Intersecting forces
Non-coplanar non-concurrent forces

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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

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

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Engineering Mechanics
The forces, which meet at one point and their lines of action also lie on the same plane, are known as

Coplanar non-concurrent forces
Coplanar concurrent forces
Non-coplanar concurrent forces
Non-coplanar non-concurrent forces

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