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Engineering Mechanics

Engineering Mechanics
The moment of inertia of a thin rod of mass 'm' and length 'l', about an axis through its centre of gravity and perpendicular to its length is

ml2/12
ml2/8
ml2/4
ml2/ 6

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Engineering Mechanics
Whenever a force acts on a body and the body undergoes a displacement, then

Work is said to be done
Body has kinetic energy of translation
Power is being transmitted
None of these

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Engineering Mechanics
The moment of inertia of a square of side (a) about an axis through its center of gravity is

a4/8
a4/36
a4/4
a4/12

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

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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

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

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Engineering Mechanics
A machine having an efficiency greater than 50%, is known as

Ideal machine
Neither reversible nor non-reversible machine
Reversible machine
Non-reversible machine

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