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Engineering Mechanics

Engineering Mechanics
The centre of percussion is below the centre of gravity of the body and is at a distance equal to

h2/kG
h × kG
h/kG
kG2/h

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Engineering Mechanics
A screw jack used for lifting the loads is

A reversible machine
An ideal machine
None of these
A non-reversible machine

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Engineering Mechanics
A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is (where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)

MS/3
MS/4
MS/5
None of these

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Engineering Mechanics
The moment of inertia of a solid sphere of mass ‘m’ and radius ‘r’ is

2mr²/3
2mr²/5
mr²/2
mr²

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Engineering Mechanics
A smooth cylinder lying on a __________ is in neutral equilibrium.

None of these
Convex surface
Curved surface
Horizontal surface

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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

2mr²/3
3mr²/5
2mr²/5
mr²/3

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