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Engineering Mechanics

Engineering Mechanics
The center of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

4r/ 3π
3r/4π
3r/ 8
8r/3

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Engineering Mechanics
Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.

Upwards
Horizontal
Downwards
None of these

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Engineering Mechanics
The unit of moment of inertia of an area is

m4
kg/m2
kg-m-s2
kg-m2

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

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

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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.)

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

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

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