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Engineering Mechanics

Engineering Mechanics
In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.

More than
Less than
Equal to
None of these

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Engineering Mechanics
The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is

2mr²/5
mr²/3
3mr²/5
2mr²/3

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

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Engineering Mechanics
The energy possessed by a body, for doing work by virtue of its position, is called

Electrical energy
Kinetic energy
Chemical energy
Potential energy

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Engineering Mechanics
When a body of mass moment of inertia 'I' (about a given axis) is rotated about that axis with an angular velocity to, then the kinetic energy of rotation is

Iω
Iω2
0.5 Iω
0.5 Iω2

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Engineering Mechanics
The periodic time of one oscillation for a simple pendulum is (where l = Length of the pendulum.)

(1/2π). √(g/l)
None of these
(1/2π). √(l/g)
2π. √(l/g)

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