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Engineering Mechanics

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

Zero
None of these
Maximum
Minimum

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Engineering Mechanics
The maximum efficiency of a lifting machine is

1/m
V.R./m
m/V.R.
1/(m × V.R.)

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Engineering Mechanics
The resultant of the two forces ‘P’ and ‘Q’ is ‘R’. If ‘Q’ is doubled, the new resultant is perpendicular to ‘P’. Then

Q = 2R
Q = R
P = Q
None of the listed here

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

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

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Engineering Mechanics
If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

90°
30°
60°
120°

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Engineering Mechanics
When a body of mass 'm' attains a velocity 'v' from rest in time 't', then the kinetic energy of translation is

mv2
0.5 mgv2
mgv2
0.5 mv2

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