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Engineering Mechanics

Engineering Mechanics
The range of a projectile is maximum, when the angle of projection is

30°
45°
60°
90°

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Engineering Mechanics
The velocity ratio for the third system of pulleys is

n
2n - 1
n²
2n

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Engineering Mechanics
The maximum efficiency of a screw jack is

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

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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

6f - 8
6f - 4
6t² - 8t
3t² + 2t

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Engineering Mechanics
When a body falls freely under gravitational force, it possesses __________ weight.

Maximum
Minimum
No
None of these

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

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