Spaceship Length    A spaceship sits atrest on the ground and is carefully measured to be exactly 20.000m long. Then the spaceship takes off and flies right overthe Georgetown University campus at a speed of 0.75c. Asthe spaceship flies overhead, the GU students on campus measure thelength of the spaceship to be:

Your Heartbeat    You are lying in bed onEarth and you measure your heartbeat. The next day, you aretraveling close to the speed of light in a spaceship and youmeasure your heartbeat again. Inside the fast-moving spaceship, howdoes your heartbeat compare to its value while you were in bed onEarth?


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