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...

LENGTH CONTRACTION

length=stationerylength*squareroot(1-((v*v)/(c*c)))

TIME DILATION

clockrate=stationeryclockrate*squareroot(1-((v*v)/(c*c)))

MASS INCREASE

mass=stationerymass/squareroot(1-((v*v)/(c*c)))

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.

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