1.
please help solve 3
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
Einstein’s principle of relativity is ―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.―
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.