A certain star is 19.5 light years away... (a) How long would it take a spacecra

Question

A certain star is 19.5 light years away... (a) How long would it take a spacecraft traveling 0.930c to reach that star from Earth, as measured by observers onEarth? (b) How long would it take a spacecraft traveling 0.930c to reach that star from Earth, as measured by observers on thespacecraft? (c) What is the distance traveled according to observerson the spacecraft? (d) What will the spacecraft occupants compute theirspeed to be from the results of B and C? A certain star is 19.5 light years away... (a) How long would it take a spacecraft traveling 0.930c to reach that star from Earth, as measured by observers onEarth? (b) How long would it take a spacecraft traveling 0.930c to reach that star from Earth, as measured by observers on thespacecraft? (c) What is the distance traveled according to observerson the spacecraft? (d) What will the spacecraft occupants compute theirspeed to be from the results of B and C?

Explanation / Answer

a) 19,5/0,93=21 years. b) time measured by the ob on the spacecraft. T=21*sqrt(1-0,93^2)=7,7 years c) it is 0,93*7,7=7,18 light years. d) it is 0,93 c.

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