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Engineering Mechanics

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

2mr²/5
2mr²/3
7mr²/5
7mr²/3

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Engineering Mechanics
A particle moves along a straight line such that distance (x) traversed in 't' seconds is given by x = t² (t - 4), the acceleration of the particle will be given by the equation

6t² - 8t
3t² + 2t
6f - 8
6f - 4

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Engineering Mechanics
The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)

t = 2u sin (α - β)/g cos β
t = g cos β/2u sin (α + β)
t = 2u sin (α + β)/g cos β
t = g cos β/2u sin (α - β)

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Engineering Mechanics
The time of flight of a projectile on downward inclined plane depends upon

None of these
Angle of inclination of the plane
Angle of projection
Both (A) and (B)

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Engineering Mechanics
The power developed by a body acted upon by a torque 'T' Newton meter (N - m) and revolving at ω radian/s is given by

T.ω/75 (in kilowatts)
T.ω/4500 (in kilowatts)
T.ω/60 (in watts)
T.ω (in watts)

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Engineering Mechanics
Work done is said to be zero, when

Either (A) or (B)
None of these
Some force acts on a body, but displacement is zero
No force acts on a body but some displacement takes place

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