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.
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.
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1. 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.
2. 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
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