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Equation (2) can be used to provide expressions from which the velocity V may
be calculated in special cases. Hooke's law of elasticity (see elasticity) states that
elastic stress is always proportional to elastic strain; that is, stress divided by ...
In Snell's law, equation (7), if the velocity in medium I is greater than that in
medium II (V-^ > V2), the index of refraction is greater than one (n12 > 1) and
refraction takes place for every angle of incidence. If the velocity in medium I is
less than ...
(200 kilometres), Earth orbital velocity is about 18,000 miles (29,000 kilometres)
per hour. Since this 125-mile altitude is above most of the atmosphere,
aerodynamic drag is not great, and the spacecraft will continue to orbit for an
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review