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Engineering Mechanics

Engineering Mechanics
The acceleration of a particle moving with simple harmonic motion, at any instant is given by

ω.y
ω2/y
ω2.y
ω3.y

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Engineering Mechanics
In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

P = W cos (α + φ)
P = W tan (α + φ)
P = W tan (α - φ)
P = W tan (φ - α)

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Engineering Mechanics
The maximum height of a projectile on a horizontal plane, is

u² cos²α/2g
u² cos²α/g
u² sin²α/2g
u² sin²α/g

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Engineering Mechanics
The periodic time of one oscillation for a simple pendulum is (where l = Length of the pendulum.)

(1/2π). √(g/l)
None of these
2π. √(l/g)
(1/2π). √(l/g)

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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 maximum velocity of a particle moving with simple harmonic motion is

ω2r
ω/r
ωr
ω

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