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Engineering Mechanics

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

Weight
Mass
Impulsive force
Momentum

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Engineering Mechanics
Work done is said to be zero, when

None of these
No force acts on a body but some displacement takes place
Either (A) or (B)
Some force acts on a body, but displacement is zero

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Engineering Mechanics
If a number of forces are acting at a point, their resultant will be inclined at an angle 'θ' with the horizontal, such that

tanθ = √(ΣV + ΣH)
tanθ = ΣV/ΣH
tanθ = ΣV × ΣH
tanθ = ΣH/ΣV

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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/ 6
ml2/8
ml2/4
ml2/12

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Engineering Mechanics
The frequency of oscillation of a compound pendulum is (where kG = Radius of gyration about the centroidal axis, and h = Distance between the point of suspension and C.G. of the body.)

2π. √(kG² + h²/gh)
1/2π. √(gh/kG² + h²)
2π. √(gh/kG² + h²)
1/2π. √(kG² + h²/gh)

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Engineering Mechanics
If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

g/2
g/4
g/3
None of these

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