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- 1. Multiple Choice
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, the times are compared. What do you expect to occur?
More time elapsed on the stationary clock
More time elapsed on the traveling clock
No time has changed between them
- 2. Multiple ChoiceWe do not usually observe relativistic effects in our daily lives becausewe 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.
- 3. Multiple ChoiceIf you travel at the speed of light a second can be observed to last forever.TrueFalse
- 4. Multiple ChoiceOne of the most startling consequences of time dilation is that a moving clock ______________ relative to a stationary observer.Speeds upSlows down
- 5. Multiple Choice
The relativistic expression for length contraction of an object moving at velocity v is
- 6. Multiple ChoiceA particle with a lifetime of 2.0 × 10^–6 s moves through the laboratory with a speed of 0.9 c. Its lifetime, as measured by an observer in the laboratory, is2.0 × 10^–6 s3.2 × 10^–6 s4.6 × 10^–6 s5.4 × 10^–6 s6.3 × 106–6 s
- 7. Multiple Choice
A train has a rest length of 100 m. Traveling at a very high velocity, it goes through a tunnel of length 80 m. Observers located at both ends of the tunnel note that at one instant the train appears to exactly fit within the tunnel.
What is the velocity of the train expressed in units of c?
0.333 c
0.50 c
0.60 c
0.80 c
0.866c
- 8. Multiple ChoiceHow fast does a rocket have to move relative to an observer for its length to be contracted to 95% of its original length?0.2 c0.3 c0.4 c0.5 c
- 9. Multiple Choice
A Klingon spaceship is approaching Earth at approximately 0.8 c measured relative to Earth. The spaceship directs a laser beam forward directly through your physics classroom window.
You measure the speed of this light to be:
1.8 c
1.0 c
0.9 c
0.8 c
0.2 c
- 10. Multiple ChoiceWhat 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.
- 11. Multiple Choice
An object moving at a relativistic speed past a stationary observer appears to
have length expanded and have a faster clock
have length contracted and have a slower clock
have length contracted and have a faster clock
have length expanded and have a slower clock
- 12. Multiple Choice
If you were to travel at a speed close to the speed of light, you would notice which of the following?
Your mass has increased.
Your pulse rate has decreased.
Your ship has contracted
You would notice none of these effects because you are in an inertial frame.
- 13. Multiple Choice
The animation depicts a...
Galilean Transformation
Lorentz Transformation
- 14. Multiple Choice
The animation depicts a...
Galilean Transformation
Lorentz Transformation
- 15. Multiple Choice
Given the info in the diagram, find the coordinates of the spacetime event at the dot relative to the rest frame.
- 16. Multiple Choice
The half-life of a muon is 2.2 µs. How fast is it moving relative to an observer who says its half-life is 4.4 µs?
0.87 c
0.75 c
0.97 c
0.72 c
- 17. Multiple Choice
A clock moves along the x-axis in your reference frame at a speed of 0.80c and reads zero as it passes the origin. What time does it read as it passes the 180 meter mark on this axis?
2.22 micro-seconds
0.90 micro-seconds
0.45 micro-seconds
- 18. Multiple Choice
A 520 m long (measured when the spaceship is stationary) spaceship passes by the Earth. What length would the people on Earth say the spaceship was as it passed the Earth at 0.87c?
256 m
1056 m
452 m
67 m
- 19. Multiple Choice
A stationary observer on Earth observes spaceships A and B moving in the same direction toward the Earth. Spaceship A has speed 0.5c and spaceship B has speed 0.80c.
Determine the velocity of spaceship A as measured by an observer at rest in spaceship B.
0.5c
0.3c
1.3c
1c
- 20. Multiple Choice
Two spaceships approach each other, each moving with the same speed as measured by a stationary observer on the Earth. Their relative speed is 0.70c.
Determine the speed of each spaceship as measured by the stationary observer on Earth.
Both move at a speed of 0.41c in Earth's frame.
Both move at a speed of 0.7c in Earth's frame.
Both move at a speed of 1.4c in Earth's frame.
Both move at a speed of 0.29c in Earth's frame.
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