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ENGINEERING MECHANICS

Engineering Mechanics
The centre of percussion of the homogeneous rod of length ‘L’ suspended at the top will be

2L/3
L/3
L/2
3L/4

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Engineering Mechanics
The units of moment of inertia of mass are

kg-m²
kg/m
m²/kg
kg/m²

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Engineering Mechanics
Mass moment of inertia of a uniform thin rod of mass M and length (l) about its mid-point and perpendicular to its length is

(3/4) Ml²
(1/12) Ml²
(2/3) Ml²
(1/3) Ml²

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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 non-concurrent forces
Non-coplanar concurrent forces
Coplanar non-concurrent forces
Coplanar 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)
(u₂ + u₁)/(v₂ + v₁)
(u₁ - u₂)/(v₁ - v₂)

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