Theory of Machine
The example of successfully constrained motion is a

Piston reciprocating inside an engine cylinder
All of these
Motion of an I.C. engine valve
Motion of the shaft between a footstep bearing

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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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