Chapter32 Relativity 32-3 The two postulates (P736-737) (1)The relativity postulate: the laws of physics are the same for observers in all inertial reference frames No frame is preferred.(相对性原理:物理规律对 所有的惯性系都是一样的,没有特例.P737) (2)The speed of light postulate: the speed of light in vacuum has the same value c=2.998x108m/s in all directions and in all inertial reference frames (34 速不变原理P737) Einsteins theory is based on the two postulates.(1)The relativity postulate: the laws of physics are the same for observers in all inertial reference frames. No frame is preferred.（相对性原理：物理规律对 所有的惯性系都是一样的，没有特例. P737） (2)The speed of light postulate: the speed of light in vacuum has the same value c=2.998x10 8m/s in all directions and in all inertial reference frames.（光 速不变原理 P737） Einstein’s theory is based on the two postulates. 32-3 The two postulates（P736-737）