Author Question: Length contraction occurs: a. only along the direction of relative motion. b. only perpendicular ... (Read 48 times)

plus1 · **on:** Jul 28, 2018

Length contraction occurs:
a. only along the direction of relative motion.
b. only perpendicular to the direction of relative motion.
c. in the frame where the moving object is at rest.
d. in all directions.
e. at a single direction that is unrelated to the direction of relative motion.

Question 2

What behavior of muons moving through Earth's atmosphere was different compared to muons at rest in a way that helped confirm time dilation?
a. They moved a shorter distance in Earth's reference system than in their own.
b. Their size was smaller as seen from Earth's reference system.
c. Their arrival in Earth's atmosphere and their detection on the ground were no longer synchronized.
d. Their speed was different as seen in Earth's reference system and in the reference system in which they were at rest.
e. They lived longer as shown by traveling farther before decay in Earth's reference system.