Category Archives: physics

Astronomical unit

Astronomical
unit:  mean distance between
the Earth and the Sun.

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Catenary

Supported at each
end, a hanging cable forms
a catenary.

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Speed of sound

Sound travels faster
in liquids and non-porous
solids than in air.

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The speed of sound

The speed of sound in
dry warm air is about one
mile in five seconds.

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Light year

A light year is the
distance light travels in a
year in a vacuum.

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Wave-particle duality

Light has properties
of a wave and properties
of a particle.

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Newton’s third law of motion

Each action has a
reaction that’s its equal
and its opposite.

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