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Engineering Mechanics

Engineering Mechanics
The moment of inertia of a solid cone of mass ‘m’ and base radius ‘r’ about its vertical axis is

2mr²/5
3mr²/10
3mr²/5
4mr²/5

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Engineering Mechanics
The efficiency of a lifting machine is the ratio of

Work done by the machine to the work done on the machine
Mechanical advantage to the velocity ratio
All of these
Output to the input

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Engineering Mechanics
The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion, and y = Displacement of the particle from mean position.)

ω.√(y² - r²)
ω².√(r² - y²)
ω.√(r² - y²)
ω².√(y² - r²)

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Engineering Mechanics
The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.

None of these
Equal to
Less than
Greater than

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Engineering Mechanics
A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

3 m
1 m
4 m
2 m

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Engineering Mechanics
The forces which do not meet at one point and their lines of action do not lie on the same plane are known as

Coplanar non-concurrent forces
Non-coplanar concurrent forces
Coplanar concurrent forces
None of these

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