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Engineering Mechanics

Engineering Mechanics
If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

g/4
g/3
g/2
None of these

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Engineering Mechanics
Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

None of these
Twice the area of the triangle
Half the area of the triangle
Area of the triangle

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Engineering Mechanics
If a number of forces are acting at a point, their resultant will be inclined at an angle 'θ' with the horizontal, such that

tanθ = √(ΣV + ΣH)
tanθ = ΣV × ΣH
tanθ = ΣV/ΣH
tanθ = ΣH/ΣV

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Engineering Mechanics
A cable with a uniformly distributed load per horizontal meter run will take the following shape

Hyperbola
Straight line
Parabola
Elliptical

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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
v = u + a.t
All of these

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

2n - 1
n²
n
2n

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