What is the emission energy of the first line of the LYMAN series
(electron_mass * e^4 / (8 * e0^2 * h^2)) * (1/1 - 1/2) ? eV
= 6.80287 eV
An airplane flying in a crosswind has an air speed of 120 knots and
true ground speed of 167 miles per hour, what is the windspeed?
sqrt ( (167 miles/hour)^2 - (120 knots)^2 ) ? kph
= 151.134 kph
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