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Engineering Mechanics

Engineering Mechanics
The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (α) is

30° + β/2
60° + β/2
45° + β/2
β/2

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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

7mr²/3
2mr²/5
7mr²/5
2mr²/3

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Engineering Mechanics
If two bodies having masses m1 and m2 (m1>m2) have equal kinetic energies, the momentum of body having mass m1 is _________ the momentum of body having mass m2.

None of these
Less than
Equal to
Greater than

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Engineering Mechanics
For a self locking machine, the efficiency must be

Less than 50%
1
Equal to 50%
Greater than 50%

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

h/kG
kG2/h
h2/kG
h × kG

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Engineering Mechanics
The rate of doing work is known as

Potential energy
Kinetic energy
Power
None of these

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