Many very good HSC Physics students become confused in the relativity section of the space topic due to the poor wording of the practice questions in some textbooks. Here is a graded list of questions to help students gain confidence in time dilation problems. The questions refer to hypothetical objects and are designed for examination purposes. These questions are numerical,  so that students can gain an understanding of these concepts by attaching numbers to them. The answers are given in square brackets after the question.

Time. These questions compare the time intervals to (the time interval of an event as measured on a clock in the reference frame in which the event happens at the same location, called the proper time) and tv (the time interval of the event according to a clock in any other inertial reference frame) using the equation