Physics

Steven Stephenson

27 September, 03:17

A spaceship approaches the earth with a speed 0.50c. A passenger in the spaceship measures his heartbeat as 9 - beats per minute. What is his heartbeat rate according to an observer that is at rest relative to the earth? A) 69 beats per minute B) 73 beats per minute C) 65 beats per minute D) 61 beats per minute E) 80 beats per minute