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Engineering Mechanics

Engineering Mechanics
The angular velocity (in rad/s) of a body rotating at N revolutions per minute is

2πN/180
2πN/60
πN/180
πN/60

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Engineering Mechanics
The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.

Greater than
None of these
Equal to
Less than

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Engineering Mechanics
The coefficient of restitution for inelastic bodies is

More than one
One
Zero
Between zero and one

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Engineering Mechanics
The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)

P = mW - C
P = mW + C
P = m/W + C
P = C - mW

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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/2
0.134 r
r/3
r/A

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Engineering Mechanics
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Upwards at its upper end
Perpendicular to the wall at its upper end
Downwards at its upper end
Zero at its upper end

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