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Engineering Mechanics

Engineering Mechanics
The impact between two lead spheres is approximately equal to an __________ impact.

None of these
Solid
Inelastic
Elastic

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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 = IG - Ah2
IP = Ah2 / IG

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Engineering Mechanics
The maximum acceleration of a particle moving with simple harmonic motion is

ωr
ω²r
ω
ω/r

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Engineering Mechanics
The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)

t = g cos β/2u sin (α - β)
t = 2u sin (α + β)/g cos β
t = 2u sin (α - β)/g cos β
t = g cos β/2u sin (α + β)

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Engineering Mechanics
If a body is acted upon by a number of coplanar non-concurrent forces, it may

All of these
Be completely at rest
Rotate about itself without moving
Move in any one direction rotating about itself

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Engineering Mechanics
A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

Away from the wall at its upper end
Downward at its upper end
Upward at its upper end
Towards the wall at its upper end

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