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Engineering Mechanics

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

2mr²/5
3mr²/5
mr²/3
2mr²/3

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Engineering Mechanics
Static friction is always __________ dynamic friction.

Less than
Equal to
None of these
Greater than

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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 width (b), is

bd³/36
bd³/12
db³/36
db³/12

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Engineering Mechanics
According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

IP = IG / Ah2
IP = IG - Ah2
IP = IG + Ah2
IP = Ah2 / IG

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Engineering Mechanics
The bodies which rebound after impact are called

Neither elastic nor inelastic bodies
Inelastic bodies
None of these
Elastic bodies

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Engineering Mechanics
The periodic time of a particle with simple harmonic motion is _________ proportional to the angular velocity.

None of these
Square root
Directly
Inversely

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