Special Relativity

If you travel at the speed of light a second can be observed to last forever.

• True
• False

There are two clocks. One is stationary on the Earth. The other is traveling close to the speed of light around the Earth. If we put the clocks back together after the second clock makes it back from its trip. What do you expect to occur?

• More time elapsed on the stationary clock

• More time elapsed on the traveling clock

• The same amount of time elapsed on both clocks

Based on the concepts of Special Relativity time travel is...

• not possible

• possible only in the ability to travel into the past.

• possible only in the ability to travel to the future.

• possible to travel either forward or backward in time.

A train traveling at 15 m/s relative to the ground. A person on the train throws a baseball with a speed of 15 m/s in the direction opposite the motion of the train.

How fast does a person on the sidewalk see the ball move?

• 30 m/s

• 15 m/s

• 0 m/s

• 20 m/s

There are two twins on Earth. One flies off on a spacecraft traveling 90% of 'c' while the other twin stays on Earth. Which of the following is TRUE?

• The twin on the spacecraft will age more slowly than the Earth-bound sibling

• Time in each frame of reference proceeds differently at different speeds

• This is an example of the 'Twin Paradox'

• All answers are true

From the frame of reference of the Earth...

• Time on the spaceship ticks slower than time on the Earth clock.

• Time on the spaceship ticks faster than time on the Earth clock.

• Time on the spaceship ticks at the same rate as the Earth clock.

• Time on the Earth ticks slower than time on the spaceship clock.

From the frame of reference of the space ship..

• Time on Earth ticks faster than time on spaceship clock.

• Time on the spaceship ticks slower than time on Earth clock.

• Time on the spaceship ticks at the same rate as the Earth clock.

• Time on Earth ticks slower than time on spaceship clock.

According to Einstein what quantity is subjective and variable?

• time

• energy

• matter

• God

Compared to clocks in a stationary reference frame moving clocks run 

• faster
• slower
• at the same rate

Time is measured by the observation of repeating events.

• True

• False