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Engineering Mechanics

Engineering Mechanics
The total motion possessed by a body, is called

Momentum
Impulsive force
Weight
Mass

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Engineering Mechanics
An ideal machine is one whose efficiency is

Between 60 and 70 %
1
Between 70 and 80%
Between 80 and 90%

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Engineering Mechanics
The maximum efficiency of a screw jack is

(1 - sinφ)/(1 + sinφ)
(1 - tanφ)/(1 + tanφ)
(1 + sinφ)/(1 - sinφ)
(1 + tanφ)/(1 - tanφ)

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

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

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Engineering Mechanics
The maximum velocity of a particle moving with simple harmonic motion is

ω/r
ωr
ω
ω2r

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Engineering Mechanics
The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion, and y = Displacement of the particle from mean position.)

ω².√(r² - y²)
ω.√(y² - r²)
ω².√(y² - r²)
ω.√(r² - y²)

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