Engineering Mechanics
The velocity ratio of a differential wheel and axle with 'D' as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is

2D/(d₁ - d₂)
D/(d₁ - d₂)
2D/(d₁ + d₂)
D/(d₁ + d₂)

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Engineering Mechanics
Non-coplanar concurrent forces are those forces which

Do not meet at one point, but their lines of action lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane
Meet at one point and their lines of action also lie on the same plane

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