Theory of Machine
Two systems shall be dynamically equivalent when

The mass of two are same
All of these
G. of two coincides
M.I. of two about an axis through e.g. is equal

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Theory of Machine
Open pairs are those which have

Elements of pairs not held together mechanically
Two elements that permit relative motion
Point or line contact between the two elements when in motion
Surface contact between the two elements when in motion

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Theory of Machine
Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of an open belt drive. The length of the belt is

π (r₁ - r₂) + (r₁ - r₂)²/x + 2x
π (r₁ - r₂) + (r₁ + r₂)²/x + 2x
π (r₁ + r₂) + (r₁ - r₂)²/x + 2x
π (r₁ + r₂) + (r₁ + r₂)²/x + 2x

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