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

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Engineering Mechanics
When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ to its acceleration.

Directly proportional
Inversely proportional
Cube root
None of these

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

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

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Engineering Mechanics
If the body falls freely under gravity, then the gravitational acceleration is taken as

-9.8 m/s2
+8.9 m/s2
-8.9 m/s2
+9.8 m/s2

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Engineering Mechanics
The moment of inertia of a square of side a about its diagonal is

a⁴/12
a⁴/16
a³/12
a²/8

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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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