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Engineering Mechanics

Engineering Mechanics
A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

None of these
Reversible
Ideal
Non-reversible

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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

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

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

Zero at its upper end
Upward at its upper end
Downward at its upper end
Perpendicular to the wall at its upper end

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Engineering Mechanics
Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is

bd³/12
bd³/36
db³/12
db³/36

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Engineering Mechanics
The unit of force in S.I. system of units is

Watt
Newton
Dyne
Kilogram

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Engineering Mechanics
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

Newton's first law of motion
Newton's second law of motion
None of these
Newton's third law of motion

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