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Engineering Mechanics

Engineering Mechanics
The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)

2n
n
2n - 1
n²

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Engineering Mechanics
The bodies which rebound after impact are called

None of these
Elastic bodies
Neither elastic nor inelastic bodies
Inelastic bodies

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Engineering Mechanics
The velocity ratio for the third system of pulleys is

n
2n
n²
2n - 1

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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
P + Q
Q / P
P - Q

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Engineering Mechanics
The maximum mechanical advantage of a lifting machine is

1 - m
1 + m
m
1 / m

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Engineering Mechanics
If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,

P + m.a = 0
P/m.a = 0
P × m.a = 0
P - m.a = 0

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