If astronauts could travel at v 0.950 c we on earth would, Ask an Expert

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Q. An elastic cord is 62 cm long when a weight of 57 N hangs from it but is 84 cm long when a weight of 76 N hangs from it. What is the "spring" constant k of this elastic cord?

Q. If astronauts could travel at v = 0.950c, we on Earth would say it takes (4.20 / 0.970) = 4.42 years to reach Alpha Centauri, 4.20 light-years away. The astronauts disagree. How much time passes on the astronauts' clocks? What is the distance to Alpha Centauri as measured by the astronauts?

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