A stretch of land is 12.5 km long on a map
(a) What would be its length to an observer moving by, parallel to the stretch, at 0.95c?
(b) Which length is the proper length?
(c) How fast must the observer move for the land to appear 6.50 km long?
(a) 3.9 km
(b) 12.5 km
(c) 0.854c
You might also like to view...
A protostar of 20 solar masses should form a star that will stay on the main sequence twenty times longer than our Sun
Indicate whether the statement is true or false
Based on their spin, all particles fall into which of the following categories?
A) quarks and leptons B) fermions and bosons C) matter and antimatter D) color, flavor, and mass
If three samples have the half-lives listed below, which is the most radioactive?
A) a sample with a half-life of 20 minutes B) a sample with a half-life of 20 hours C) a sample with a half-life of 20 years D) a sample with a half-life of 20 million years E) none of the above
Which of these affects the period of a string pendulum?
a. The material used to make the string. b. The force of the initial motion. c. The mass of the bob. d. The length of the string. e. The amplitude of the swing.