Physics, relativity
| Front | A spaceship approaches the earth with a speed of 0.50c. A passenger in the spaceship measures his heartbeat at 70 beats per minute. What is his hearbeat rate according to an observer that is at rest relative to the earth?A) 65 beats per minute B) 69 beats per minute C) 73 beats per minute D) 80 beats per minute E) 61 beats per minute |
| Back | E) 61 beats per minute |
| Front | One star appears blue-white while another appears yellow-orange. If this is caused by temperature difference, thenA) the stars are the same brightness B) the yellow-orange star is brighter C) the blue-white star is brighter D) the yellow-orange star is hotter E) the blue-white star is hotter |
| Back | E) the blue-white star is hotter |
| Front | An object moves in a direction parallel to its length with a velocity that approaches the velocity of light. The width of this object, as measured by a stationary observerA) decreases slightly B) approaches zero C) does not change D) increases slightly E) approaches infinity |
| Back | C) does not change |