Mesons are composed of ________ quarks, and baryons are composed of ________ quarks
a. two, two
b. two, three
c. three, two
d. three, three
b
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Suppose you measure the density (mass per volume) of an object moving by you at very high speed. How will its density compare to the density it would have at rest in your reference frame?
A) Its density would be lower. B) Its density would be higher. C) Its density would be the same. D) There is no way to know, because relativity doesn't tell us anything about density.
Why might it be difficult for Earth-like planets to form around Sun-like stars in the outer parts of the disk of our galaxy?
A) there would be insufficient amounts of heavy elements B) the stars would be packed together too densely for planets to be stable C) any stars would be sucked into the central supermassive black hole D) there would be too much harmful radiation
You are standing on a sidewalk. There is a car in the distance. The horn on the car sounds. You hear it at a pitch that corresponds to a sound frequency lower than the frequency emitted by the horn. What can you conclude?
A) The wind has a component of its velocity in a direction toward you. B) The car is moving on a line directly away from your present location. C) The wind has a component of its velocity in a direction away from you. D) The car has a component of its velocity in a direction away from you. E) Either A or C must be true.
The total energy of a particle
a. is not related to its relativistic momentum. b. increases with increasing relativistic momentum. c. decreases with increasing relativistic momentum. d. is a constant.