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Engineering Mechanics

Engineering Mechanics
The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.

Greater than
Equal to
None of these
Less than

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Engineering Mechanics
The moment of inertia of a sphere of mass 'm' and radius 'r', about an axis tangential to it, is

2mr²/3
7mr²/5
7mr²/3
2mr²/5

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Engineering Mechanics
The range of a projectile is maximum, when the angle of projection is

90°
45°
30°
60°

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Engineering Mechanics
The algebraic sum of moments of the forces forming couple about any point in their plane is

Both of above are correct
Equal to the moment of the couple
Both of above are wrong
Constant

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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 = Ah2 / IG
IP = IG / Ah2

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Engineering Mechanics
A pendulum which executes one beat per second is known as

Compound pendulum
Simple pendulum
Torsional pendulum
Second's pendulum

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