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Engineering Mechanics

Engineering Mechanics
The rate of doing work is known as

None of these
Kinetic energy
Power
Potential energy

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Engineering Mechanics
Which of the following is an equation of linear motion?(where, u and v = Initial and final velocity of the body, a = Acceleration of the body, and s = Displacement of the body in time t seconds.)

v2 = u2 + 2a.s
s = u.t + ½ a.t2
All of these
v = u + a.t

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Engineering Mechanics
The maximum efficiency of a screw jack is

(1 + sinφ)/(1 - sinφ)
(1 + tanφ)/(1 - tanφ)
(1 - tanφ)/(1 + tanφ)
(1 - sinφ)/(1 + sinφ)

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Engineering Mechanics
The acceleration of a particle moving with simple harmonic motion is __________ at the mean position.

None of these
Maximum
Minimum
Zero

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Engineering Mechanics
In order to double the period of simple pendulum, the length of the string should be

None of these
Doubled
Quadrupled
Halved

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Engineering Mechanics
If a number of forces are acting at a point, their resultant is given by

(∑V)2 +(∑H)2 +2(∑V)(∑H)
√[(∑V)2 + (∑H)2]
√[(∑V)2 +(∑H)2 +2(∑V)(∑H)]
(∑V)2 + (∑H)2

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