A friend gave me these questions to answer.(adsbygoogle = window.adsbygoogle || []).push({});

"A certain star is 7.0 light years away. How long would it take a spacecraft traveling at .950c to reach that star from Earth, as measured by observers (a ) on earth (b )on the aircraft (c ) what is the distance travled according tio observers on the spacecraft? (d ) what will the spacecraft occupants compute their speed to be from the results of (b ) and (c )?"

I fear taking the obviouse path, for it may take me to answer which contradicts that which you would get if you applied the lorentz transformations, which I know nothing of. What would be the correct way of going about this question?

and this was the second question.

"Derive the general relativist equation of T = To sr (1 - v^2/c^2)"

I have no idea of how to go solving about this one.

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# Relativity questions

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