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Engineering Mechanics

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

Q / P
P + Q
P - Q
P / Q

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Engineering Mechanics
The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as

Unlike parallel forces
Coplanar concurrent forces
Like parallel forces
Coplanar non-concurrent forces

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Engineering Mechanics
When a body of mass moment of inertia 'I' (about a given axis) is rotated about that axis with an angular velocity to, then the kinetic energy of rotation is

0.5 Iω2
0.5 Iω
Iω2
Iω

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Engineering Mechanics
The slope on the road surface generally provided on the curves is known as

Angle of friction
Angle of repose
None of these
Angle of banking

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

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

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