You are in a spaceship moving past Earth at nearly lightspeed and you observe Mort, who is on Earth. You measure his mass, pulse rate, and size. How are they different from the values measured by Mort himself?
A) Mass has increased, pulse rate has speeded up, and size is reduced along the direction of motion.
B) Mass has decreased, pulse rate has slowed down, and size is reduced along the direction of motion.
C) Mass has decreased, pulse rate has speeded up, and size is reduced along the direction of motion.
D) They are unchanged, i.e., they are normal.
E) Mass has increased, pulse rate has slowed down, and size is reduced along the direction of motion.

Question

Quizplus · Accepted Answer

Due to relativistic effects, Mort's mass appears increased, his pulse rate appears slowed down, and his size appears contracted in the direction of motion from your perspective.

You Are in a Spaceship Moving Past Earth at Nearly