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Engineering Mechanics

Engineering Mechanics
The velocity ratio for the third system of pulleys is

2n
n
2n - 1
n²

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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

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

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Engineering Mechanics
The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as

Like parallel forces
Coplanar non-concurrent forces
Coplanar concurrent forces
Unlike parallel forces

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Engineering Mechanics
For a self locking machine, the efficiency must be

Less than 50%
Greater than 50%
1
Equal to 50%

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Engineering Mechanics
If a number of forces are acting at a point, their resultant is given by

(∑V)2 + (∑H)2
√[(∑V)2 +(∑H)2 +2(∑V)(∑H)]
(∑V)2 +(∑H)2 +2(∑V)(∑H)
√[(∑V)2 + (∑H)2]

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

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

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