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Engineering Mechanics

Engineering Mechanics
The total motion possessed by a body, is called

Mass
Momentum
Impulsive force
Weight

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Engineering Mechanics
When the spring of a watch is wound, it will possess

Kinetic energy
Strain energy
Electrical energy
Heat energy

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Engineering Mechanics
Which of the following is an equation of linear motion?(where, u and v = Initial and final velocity of the body, a = Acceleration of the body, and s = Displacement of the body in time t seconds.)

v2 = u2 + 2a.s
v = u + a.t
All of these
s = u.t + ½ a.t2

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

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Engineering Mechanics
The center of gravity of a quadrant of a circle lies along its central radius (r) at a distance of

0.5 r
0.8 r
0.7 r
0.6 r

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Engineering Mechanics
According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

IP = IG - Ah2
IP = IG / Ah2
IP = Ah2 / IG
IP = IG + Ah2

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