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Engineering Mechanics

Engineering Mechanics
The coefficient of friction depends upon

Shape of the surfaces
Area of contact
Nature of surfaces
All of these

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Engineering Mechanics
The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad/s2, is

a = α.r
a = α/ r
None of these
a = r / α

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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

200
50
100
400

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Engineering Mechanics
The process of finding out the resultant force is called __________ of forces.

Composition
Resolution
Decomposition
None of these

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Engineering Mechanics
The centre of gravity of a uniform lamina lies at

The centre of heavy portion
The midpoint of its axis
The bottom surface
All of these

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Engineering Mechanics
A body of mass ‘m’ moving with a constant velocity ‘v’ strikes another body of same mass moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is

2v
8v
v
4v

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