A radar antenna is rotating and makes one revolution every 26 s, as measured on earth. However, instruments on a spaceship moving with respect to the earth at a speed v measure that
the antenna makes one revolution every 50 s. What is the ratio $v/c$ of the speed v to the speed c of light in a vacuum?
-/1 points
CJ10 28.P.003.
Suppose you are planning a trip in which a spacecraft is to travel at a constant velocity for exactly ten months, as measured by a clock on board the spacecraft, and then return home at the
same speed. Upon return, the people on earth will have aged exactly one hundred twenty-five years. According to special relativity, how fast must you travel? (Express your answer to at
least 5 significant figures as a multiple of c for example, 0.95585c.)
-/2 points
CJ10 28.P.004.GO.
Suppose that you are traveling on board a spacecraft that is moving with respect to the earth at a speed of 0.952c. You are breathing at a rate of 8.0 breaths per minute. As monitored on
earth, what is your breathing rate?
R = -Select-
-/1 points
CJ10 28.P.006.