Laws of Physics Question and Answer/ Verified
1) Which of the following are basic postulates of special relativity? (There are two correct choices.) -
✔✔C) The speed of light is the same for all observers.
E) The laws of physics are the same in all inertial reference frames.
2) A spaceship is moving in a straight line away from Earth at 0.80c, measured relative to Earth. It
launches a missile that moves away from the spaceship in the forward direction at 0.60c, relative to the
ship. Relative to Earth, what is the speed of this missile? - ✔✔D) greater than 0.80c but less than c
3) A really high-speed train moves in a direction parallel to its length with a speed that approaches the
speed of light. The length of the train, as measured by a stationary observer on the ground, - ✔✔A)
decreases due to the motion.
4) If you were in a spaceship traveling close to the speed of light with respect to Earth, you would notice
that - ✔✔E) none of the above effects occur.
5) 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? - ✔✔D) You should give up because you have taken on an impossible task!
6) One of Einstein's postulates in formulating the special theory of relativity was that the laws of physics
are the same in reference frames that - ✔✔D) move at constant velocity with respect to an inertial
frame.
7) You are a passenger on a spaceship. As the speed of the spaceship increases, you will observe - ✔✔B)
nothing unusual about the behavior of your watch.
8) The laws of physics are the same in all inertial frames of reference. - ✔✔A) true
9) Observer A sees a ruler moving by in a relativistic train and measures its length to be L with
subscript((A)). Observer B moves together with the train and measures the length of the ruler to be L
with subscript((B)). These two results will be such that - ✔✔B) L with subscript((A)) < L with
subscript((B))
1) Which of the following are basic postulates of special relativity? (There are two correct choices.) -
✔✔C) The speed of light is the same for all observers.
E) The laws of physics are the same in all inertial reference frames.
2) A spaceship is moving in a straight line away from Earth at 0.80c, measured relative to Earth. It
launches a missile that moves away from the spaceship in the forward direction at 0.60c, relative to the
ship. Relative to Earth, what is the speed of this missile? - ✔✔D) greater than 0.80c but less than c
3) A really high-speed train moves in a direction parallel to its length with a speed that approaches the
speed of light. The length of the train, as measured by a stationary observer on the ground, - ✔✔A)
decreases due to the motion.
4) If you were in a spaceship traveling close to the speed of light with respect to Earth, you would notice
that - ✔✔E) none of the above effects occur.
5) 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? - ✔✔D) You should give up because you have taken on an impossible task!
6) One of Einstein's postulates in formulating the special theory of relativity was that the laws of physics
are the same in reference frames that - ✔✔D) move at constant velocity with respect to an inertial
frame.
7) You are a passenger on a spaceship. As the speed of the spaceship increases, you will observe - ✔✔B)
nothing unusual about the behavior of your watch.
8) The laws of physics are the same in all inertial frames of reference. - ✔✔A) true
9) Observer A sees a ruler moving by in a relativistic train and measures its length to be L with
subscript((A)). Observer B moves together with the train and measures the length of the ruler to be L
with subscript((B)). These two results will be such that - ✔✔B) L with subscript((A)) < L with
subscript((B))
