Problem: Ted travels in a spaceship at 0.45 c relative to Alice, who's at rest on the Earth's surface. Ted travels for 20s, as measured on his watch.  (a) Who measures the proper time, Ted or Alice? (b) How much time elapses on Alice's watch during this motion?

FREE Expert Solution
Problem Details

Ted travels in a spaceship at 0.45 c relative to Alice, who's at rest on the Earth's surface. Ted travels for 20s, as measured on his watch. 

(a) Who measures the proper time, Ted or Alice?

(b) How much time elapses on Alice's watch during this motion?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Consequences of Relativity concept. You can view video lessons to learn Consequences of Relativity. Or if you need more Consequences of Relativity practice, you can also practice Consequences of Relativity practice problems.

How long does this problem take to solve?

Our expert Physics tutor, Douglas took 1 minute and 41 seconds to solve this problem. You can follow their steps in the video explanation above.