At an astronomical meeting, it is reported two galaxies had been detected, approaching each other with speeds of 0.700c and 0.600c (relative to the Earth), respectively. As a cub reporter, you are tempted to rush out and report that something traveling faster than the speed of light has been discovered, that is, the distance between the galaxies is shrinking at a rate of 1.30c. But hold on! Upon further thought, you realize that this event does not violate the laws of physics (relativity). How would you rewrite your story explaining why the separation shrinkage rate exceeding c is not inconsistent with the prediction of relativity?
Answer to relevant QuestionsAs a space station commander, you see two rockets traveling to opposite ends of the galaxy. Rocket A is traveling at 0.800c and rocket B is traveling in exactly the opposite direction at 0.700c. Will A and B each claim that ...Two identical high-speed rockets pass your (inertial) space station. Their pilots each claim that their rocket is 100 m long. You measure the length of rocket A to be 89 m and that of rocket B to be 79 m. Which one is ...Alpha Centauri, a star close to our solar system, is about 4.3 light-years away. Suppose a spaceship traveled this distance at a constant speed of 0.90c relative to Earth. (a) How long did the trip take according to an ...An electron travels at a speed of 0.600c. What is its kinetic and total energy? A proton is traveling at a speed of 0.55c. What are its (a) Total energy, (b) Kinetic energy, and (c) Momentum?
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