Two systems k and k’ synchronize their clocks at t = t’ = 0 when their origins are aligned as system k’ passes by system k along the x axis at relative speed 0.8c. at time t = 3 ns, frank (in system k) shoots a proton gun having proton speeds of 0.98c along his x axis. the protons leave the gun at x = 1 m and arrive at a target 120 m away. determine the event coordinates (x, t) of the gun firing and of the protons arriving as measured by observers in both systems k and k’.

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.