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Engineering Mechanics

Engineering Mechanics
The time of flight (t) of a projectile on a horizontal plane is given by

t = 2u/g.sinα
t = 2u. tanα/g
t = 2u. cosα/g
t = 2u. sinα/g

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Engineering Mechanics
The centre of gravity of a uniform lamina lies at

The midpoint of its axis
The centre of heavy portion
The bottom surface
All of these

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

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Engineering Mechanics
One kg force is equal to

8.9 N
7.8 N
9.8 N
12 N

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Engineering Mechanics
Centre of gravity of a solid cone lies on the axis at the height

One third of the total height above base
Three eighth of the total height above the base
One fourth of the total height above base
One-half of the total height above base

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

mr²/3
2mr²/3
2mr²/5
3mr²/5

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