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Engineering Mechanics

Engineering Mechanics
When a body of mass 'm' attains a velocity 'v' from rest in time 't', then the kinetic energy of translation is

0.5 mgv2
mv2
0.5 mv2
mgv2

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

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Engineering Mechanics
In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

P = W cos (α + φ)
P = W tan (α - φ)
P = W tan (α + φ)
P = W tan (φ - α)

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Engineering Mechanics
An ideal machine is one whose efficiency is

Between 80 and 90%
Between 60 and 70 %
Between 70 and 80%
1

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Engineering Mechanics
The moment of inertia of a sphere of mass 'm' and radius 'r', about an axis tangential to it, is

7mr²/3
2mr²/3
7mr²/5
2mr²/5

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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

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

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