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Engineering Mechanics

Engineering Mechanics
If the gravitational acceleration at any place is doubled, then the weight of a body will be

√2.g
g
2g
g/2

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Engineering Mechanics
A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

P = W (cosα + μsinα)
P = W tanα
P = W (sinα + μcosα)
P = W tan (α + φ)

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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 velocity ratio in case of an inclined plane inclined at angle 'θ' to the horizontal and weight being pulled up the inclined plane by vertical effort is

tanθ
cosecθ
sinθ
cosθ

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Engineering Mechanics
A pendulum which executes one beat per second is known as

Compound pendulum
Torsional pendulum
Simple pendulum
Second's pendulum

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Engineering Mechanics
The power developed by a body acted upon by a torque 'T' Newton meter (N - m) and revolving at ω radian/s is given by

T.ω/4500 (in kilowatts)
T.ω/75 (in kilowatts)
T.ω/60 (in watts)
T.ω (in watts)

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