Physics
The size of gear is usually specified by

Circular pitch
Pitch circle diameter
Diametral pitch
Pressure angle

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Physics
Conservation of energy refers to the fact that

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

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Physics
It is dangerous to observe Solar eclipse with naked eyes because

All radiations from sun initiate chemical reactions in eyes
Cosmic rays reach eyes more during the eclipse
Ultraviolet radiations from Sun burn our retina
Infrared radiations from sun burn our retina

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