Special Theory of Relativity: Time Dilation

Description

A moving red rectangle simulates a space ship. A space beacon, the vertical green rectangle, emits a light flash when each end passes by.

Question 10.1.1a

A spaceship (red) flies close to a space beacon (green) at 70% of the speed of light. The beacon emits light flashes as shown in the animation.  The time shown in the upper left hand corner is the time as measured in the reference frame of the beacon.  Click-drag to measure the size of objects in meters.

• What is the time difference between these light flashes as seen by the crew inside the space ship? 

Question 10.1.1b

• What is the length of the spaceship as measured by the crew of the spaceship?

Reference

See Giancoli-PA: 26-5.

Answers

10.1.1a  Time difference = 0.11s

10.1.1b  Length of the spaceship = 150 m