Two identical atomic clocks are manufactured at a factory. One clock remains at the factory, and the other is transported across the country to a physics lab. When the clock arrives at the physics lab, it reads 9:00 a.m. At this same time, does the clock at the factory read a time that is before 9:00 a.m., equal to 9:00 a.m., or after 9:00 a.m.? Explain
1) Two identical atomic clocks are manufactured at a factory. One clock remains at the factory, and the other is transported across the country to a physics lab. When the clock arrives at the physics lab, it reads 9:00 a.m. At this same time, does the clock at the factory read a time that is before 9:00 a.m., equal to 9:00 a.m., or after 9:00 a.m.? Explain.
2) Suppose you are a traveling salesman for SSC, the Spacely Sprockets Company. You travel on a spaceship that reaches speeds near the
(a) When you return to Earth after a sales trip, would you prefer to be paid according to the clock at Spacely Sprockets universal headquarters on Earth, according to the clock on the spaceship in which you travel, or would your pay be the same in either case? Your goal is to get paid as much as possible.
(b) Choose the best explanation from among the following:
I. You want to be paid according to the clock on Earth, because the clock on the spaceship runs slow when it approaches the speed of light.
II. Collect your pay according to the clock on the spaceship be-cause according to you the clock on Earth has run slow.
III. Your pay would be the same in either case because motion is relative, and all inertial observers will agree on the amount of time that has elapsed.
3) Usain Bolt set a world record for the 100 m dash on August 16, 2009. If observers on a spaceship moving with a speed of 0.9250c relative to Earth saw Usain Bolt’s run and measured his time to be 25.21 s, find the time that was recorded on Earth.
4) An astronaut moving with a speed of 0.75c relative to Earth measures her heart rate to be 71 beats per minute.
(a) When an Earth-based observer measures the astronaut’s heart rate, is the result greater than, less than, or equal to 71 beats per minute? Explain.
(b) Calculate the astronaut’s heart rate as measured on Earth
5) Why do we not observe the effects of
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