Special Relativity - time dilation & length contraction

A rocket leaves Earth and travels to a star that is 10 light years as seen by the Earth. The speed of the rocket is 0.6c relative to the Earth. The time for the trip as measured on Earth is

• 16.7 years

• 20 years

• 8 years

• 12.5 years

A rocket leaves Earth and travels to a star that is 10 light years as seen by the Earth. The speed of the rocket is 0.6c relative to the Earth. The time for the trip as measured on the rocket is

• 16.7 years

• 8 years

• 15 years

• 13.3 years

A rocket leaves Earth and travels to a star that is 20 light years away as seen by the Earth. The speed of the rocket is 0.8c relative to the Earth. The time for the trip as measured on by the astronauts in the spaceship is

• 25 years

• 20 years

• 15 years

• 12 years

A rocket leaves Earth and travels to a star that is 20 light years as seen by the Earth. The speed of the rocket is 0.8c relative to the Earth. The distance from Earth to the star as measured by the astronauts is

• 25 light years

• 20 light years

• 16 light years

• 12 light years

Compared to clocks in a stationary reference frame moving clocks run 

• faster
• slower
• at the same rate

When you approach a light source, the light from that source has a speed 

• greater than c. 
• less than c. 
• equal to c.
  

Tags

NGSS.HS-PS4-1

As an object approaches the speed of light, time for that object speeds up, and it ages more quickly.

• True
• False

What does the relativity of simultaneity say?

• Two events may occur at the same time in one reference frame, but not another.
• If two events occur at the same time in one reference frame, they will occur at the same time in all reference frames.

A postulate is something that is accepted as true at the beginning of a logical argument.

• True

• False

How many postulates are there in the special theory of relativity?

• 1
• 2
• 3
• 4