This applet is about Einstein's Special Theory of Relativity. You specify a relative speed as a percentage of the speed of light, and the program calculates length contraction, time dilation and mass increase.
The formulae are...
where v is relative velocity, c is the speed of light, / means divide and * means multiply.
For more info see books by A.Einstein, or search for special relativity on the web.
Java applet source code
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