Question

Throughout this homework assignment, you may use c to denote the speed of light in both your work and final answers without using its numerical value. (This is actually preferred unless the problem requires the numerical value of c.) 1. The moon's distance from the earth is ~ 3.84 × ǐ0sm. A laser pointer is mounted on a turntable such that its beam repeatedly sweeps over the surface of the moon. If it rotates at a period of 4s, prove that its impact spot travels across the moon at about twice the speed of light. Why does this not violate the law that nothing can travel faster than the speed of light?

Answer 1