1. Alan and his brother Matt perform an experiment at a park. Alan drops a rock

Question

1. Alan and his brother Matt perform an experiment at a park. Alan drops a rock while standing on a rotating merry-go-round while Matt observes from the grass nearby. The time each person measures for the rock to hit the ground will be

Select one:

a. The same

b. Larger for Matt than for Alan

c. Larger for Alan than for Matt

d. Unable to determine as it depends on the reference frame of the rock

2. Fermilab is a national laboratory that was constructed in Batavia Illinois in 1967. Until it was shut down in 2011 it was the home to the Tevatron, the world’s second-largest energy particle accelerator that was used to accelerate particles of matter and antimatter to incredibly high speeds. For our purposes please consider an electron that has been accelerated in the Tevatron and is shooting down a 2-mile long straight path towards a detector, but from the electron’s point of view the path appears to be only about 1 meter long. From the point of view of the rest frame of the Tevatron, a clock in the reference frame of the electron would be

Select one:

a. Running slow

b. Running fast

c. The same speed as its clock

d. There is not enough information to determine

Rachel and Sarah are on a bus travelling at 5 mph past John who is standing on the sidewalk. Rachel then throws a ball forward to Sarah at a speed of 20 mph in the frame of reference of the bus. From the point of view of John, the ball is travelling with a speed of

Select one:

a. 20 mph

b. 25 mph

c. 15 mph

d. 5 mph

3. Rachel and Sarah are on a bus travelling at 5 mph past John who is standing on the sidewalk. Rachel then throws a ball forward to Sarah at a speed of 20 mph in the frame of reference of the bus. From the point of view of John, the ball is travelling with a speed of

Select one:

a. 20 mph

b. 25 mph

c. 15 mph

d. 5 mph

4. Aaron is in a rocket moving very fast relative to a lab where two observers are equidistant from a light bulb when it is switched on. Aaron notes that the light pulse reaches both observers at the same time. What can Aaron conclude about his motion?

Select one:

a. He is moving away from the observers.

b. He is moving towards the observers.

c. He is moving perpendicular to a line connecting the two observers.

d. None of the above

5. Fermilab is a national laboratory that was constructed in Batavia Illinois in 1967. Until it was shut down in 2011 it was the home to the Tevatron, the world’s second-largest energy particle accelerator that was used to accelerate particles of matter and antimatter to incredibly high speeds. For our purposes please consider an electron that has been accelerated in the Tevatron and is shooting down a 2-mile long straight path towards a detector, but from the electron’s point of view the path appears to be only about 1 meter long. From the point of view the electron the 2-mile long path appears to be only about 1 meter long. The reason is that

Select one:

a. Length is expanded in the direction of motion

b. The electron’s clock runs faster in its own reference frame

c. At the speed of the electron relativistic effects need to be considered

d. The length of the path is greater for the electron

6. According to Einstein’s theory of special relativity spacetime has how many dimensions?

Select one:

a. 2

b. 3

c. 4

d. 5

7. If the speed of light is absolute and the time it takes light to travel in two different reference frames is different, the distance the light traveled in those two reference frames is

Select one:

a. The same

b. Different

c. The same but only in an absolute reference frame

d. Unable to determine

Explanation / Answer

1)a

2)a

3)b

4)c

5)c

6)c

7)b

These are the answers for the multiple choice questions. All these things are in reference with relativity and relativistic mechanics. They are all straight forward from theroy and they don't need any calculations.

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