A 20-m long spacecraft is passing by earth at 0.8c. (a) What is the length of th

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A 20-m long spacecraft is passing by earth at 0.8c. (a) What is the length of the spacecraft measured within the moving (spacecraft) referencee frame? (b) What is the relativistic length measured from the 'rest' reference frame of earth? (c) For a proper time of 1 sec., what is the relativistic time duration for the spacecraft measured from the earth referene frame? (d) An observer on the spacecraft would age slower/faster than an observer in the rest referene frame of earth, (e) but this only applies to clocks and not all processes T/F?

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l = lo sqr root (1-v^2/c^2)
l = 20 x root of (1-0.8^2)
l = 20 x 0.36
l = 7.2m

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