Chapter 2, Problem 43E

Anna and Bob have identical spaceships 60 m long. The diagram shows Bob’s observations of Anna’s ship, which passes at a speed of $c/\sqrt{2}$ . Clocks at the back of both ships read 0 just as they pass. Bob is at the center of his ship and at $t=0$ on his wristwatch peers at a second clock on Anna’s ship.
(a) What does this clock read?
(b) Later, the back of Anna’s ship passes Bob. At what time does this occur according to Bob?
(c) What will observes in Bob’s frame see on Anna’s two clocks at this time?
(d) Identify two events that show time dilation and two that show length contraction according to Anna.