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3. As a rocket passes the Earth at 0.75c, it fires a laser perpendicular to its direction of travel. a) What is the speed of the laser beam relative to the rocket? 0.75c Earth b) What is the speed of the laser beam relative to the Earth?
Solution
Einsteinâ€™s principle of relativity is â€every nonaccelerated observer observes the same laws of nature. In other words, no experiment performed within a sealed room moving at an unchanging velocity can tell you whether you are standing still or moving.â€
and if we consider this case ,according to Einstein, light always has the same speed for all observers, namely the speed of light. Thus, the speed of laser beam which is light relative to rocket and earth is c = 3 ? 10 8 m/s.
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3. As a rocket passes the Earth at 0.75c, it fires a laser perpendicular to its direction of travel. a) What is the speed of the laser beam relative to the rocket? 0.75c Earth b) What is the speed of the laser beam relative to the Earth?
Solution
Einsteinâ€™s principle of relativity is â€every nonaccelerated observer observes the same laws of nature. In other words, no experiment performed within a sealed room moving at an unchanging velocity can tell you whether you are standing still or moving.â€
and if we consider this case ,according to Einstein, light always has the same speed for all observers, namely the speed of light. Thus, the speed of laser beam which is light relative to rocket and earth is c = 3 ? 10 8 m/s.
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