A star is 21.6 light years from earth. How long would it take a spacecraft traveling 0.950c to reach that star as measured by observers?a. On earth (seconds)b Wn the spacecraft (seconds)c. what is the distance traveled according to observers on the spacecraft (meters)d. what will the spacecraft occupants compute their speed to be from the results of b and c?

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.