Physics
The size of gear is usually specified by

Pitch circle diameter
Pressure angle
Diametral pitch
Circular pitch

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Physics
Conservation of energy refers to the fact that

If you conserve energy you will not be as tired
Energy cannot be created or destroyed but can be converted from one form to another
No chemical reaction is 100 percent efficient
The entropy of the universe is always increasing

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Physics
A cyclist leans inwards when he is negotiating a curve so that

No frictional force may be produced between the wheels and the axle
His weight may be reduced
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
He may increase his speed

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