You are riding in a spaceship that has no windows, radios, or other means for you to observe or measure what is outside. You wish to determine if the ship is stopped or moving at constant
Velocity. How can you do this?
A) You can determine if the ship is moving by determining the apparent velocity of light in the spaceship.
B) You can determine if the ship is moving by lying down and measuring your height. If you are shorter than usual, the ship is moving.
C) You can determine if the ship is moving by checking your precision time piece. If it's running slow, the ship is moving.
D) You should give up because you have taken on an impossible task!

Question

Quizplus · Accepted Answer

According to the principle of relativity, if you are in a smoothly moving vehicle without any interaction with the outside world, there is no experiment you can perform to tell whether you are moving or at rest. This is because the laws of physics are the same in all inertial frames (frames moving at constant velocity).

You Are Riding in a Spaceship That Has No Windows