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Engineering Mechanics

Engineering Mechanics
If the gravitational acceleration at any place is doubled, then the weight of a body will be

√2.g
g
2g
g/2

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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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Engineering Mechanics
In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.

Less than
None of these
Equal to
More than

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Engineering Mechanics
When a body of mass moment of inertia 'I' (about a given axis) is rotated about that axis with an angular velocity to, then the kinetic energy of rotation is

0.5 Iω2
Iω
Iω2
0.5 Iω

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Engineering Mechanics
The periodic time (T) is given by (where, ω = Angular velocity of particle in rad/s.)

2π × ω
2π/ω
ω/2π
π/ω

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Engineering Mechanics
The forces, whose lines of action are parallel to each other and act in the same directions, are known as

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

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