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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
8r/3
3r/ 8

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Engineering Mechanics
A machine having an efficiency greater than 50%, is known as

Neither reversible nor non-reversible machine
Non-reversible machine
Ideal machine
Reversible machine

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Engineering Mechanics
The horizontal range of a projectile (R) is given by

R = u² cosα/g
R = u² cos2α/g
R = u² sin2α/g
R = u² sinα/g

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Engineering Mechanics
The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

P / Q
Q / P
P - Q
P + Q

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Engineering Mechanics
Coefficient of friction depends upon

Nature of surface only
Area of contact only
None of these
Both (A) and (B)

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Engineering Mechanics
The skidding away of the vehicle on a level circular path can be avoided if the force of friction between the wheels and the ground is __________ the centrifugal force.

Equal to
Less than
Greater than
None of these

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