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Engineering Mechanics

Engineering Mechanics
The rate of doing work is known as

Power
Kinetic energy
Potential energy
None of these

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Engineering Mechanics
A framed structure is imperfect, if the numbers of members are __________ (2j - 3).

Equal to
Either (B) or (C)
Less than
Greater than

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

8r/3
4r/ 3π
3r/ 8
3r/4π

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Engineering Mechanics
The centre of percussion of the homogeneous rod of length ‘L’ suspended at the top will be

L/2
2L/3
3L/4
L/3

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Engineering Mechanics
The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

Newton's third law of motion
Newton's second law of motion
None of these
Newton's first law of motion

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Engineering Mechanics
In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is

50
200
400
100

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