Question

7-2 which of the following statements are true? a. moving objects are shorter along the direction of motion than when they are at rest. b. moving clocks run fast. c. two events that are simultaneous on one reference frame are always simultaneous in another reference frame. d. non - inertial reference frames do not exist. 7-3 the light clock experiment is a thought experiment that illustrates

Explanation:

According to the theory of special - relativity, moving objects are contracted (shorter) along the direction of motion relative to when they are at rest. Moving clocks run slow (time dilation), and the simultaneity of events is relative (two events that are simultaneous in one reference frame may not be simultaneous in another). Non - inertial reference frames do exist.

Answer:

A. Moving objects are shorter along the direction of motion when they are at rest.