Special Relativity 1

Which of the following statements is not true according to the theory of relativity? 

• As an object increases speed its mass increases. 
• As an object increases speed its length increases. 
• As an object increases speed its kinetic energy increases. 
• As an object increases speed its momentum increases. 

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.

• c + v where v is the speed at which you approach the source.

We do not usually observe relativistic effects in our daily lives because 

• we are moving at speeds much less than c. 
• we are much larger than atoms. 
• we are much heavier than elementary particles. 
• we are much lighter than stars. 

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

A rocket leaves Earth and travels to a star that is 20 light years (one light year equals 9.46E15 meters) as measured from 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

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

• 1
• 2
• 3
• 4

The speed of light is constant in all frames of reference.

• True
• False

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We do not usually observe relativistic effects in our daily lives because 

• we are moving at speeds much less than c. 
• we are much larger than atoms. 
• we are much heavier than elementary particles. 
• we are much lighter than stars.