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Engineering Mechanics

Engineering Mechanics
The coefficient of friction depends upon

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

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Engineering Mechanics
The resultant of two equal forces ‘P’ making an angle ‘θ’, is given by

2P cotθ/2
2P sinθ/2
2P cosθ/2
2P tanθ/2

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Engineering Mechanics
From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the centre of circular plate

2.5 cm
1.5 cm
0.5 cm
1.0 cm

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Engineering Mechanics
A particle inside a hollow sphere of radius r, having coefficient of friction µ can rest up to height of

r/3
0.134 r
r/A
r/2

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Engineering Mechanics
The maximum efficiency of a lifting machine is

1/m
1/(m × V.R.)
m/V.R.
V.R./m

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Engineering Mechanics
Center of gravity of a thin hollow cone lies on the axis at a height of

One-fourth of the total height above base
One-half of the total height above base
Three-eighth of the total height above the base
One-third of the total height above base

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