Assuming that our ideas about how "hot Jupiters" ended up on their current orbits are correct, why didn't our own solar system end up with any hot Jupiters?
A) Our solar nebula must have been blown into space shortly after the formation of the jovian planets.
B) Our jovian planets must have migrated outward from inside the orbit of Mercury.
C) Our solar nebula must have stuck around for an unusually long time after the formation of jovian planets.
D) The existence of Earth and the other terrestrial planets prevented the jovian planets from migrating inward.
A
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Which of the following is a solution to the wave equation, 
?
A.
B.
C.
D.
E.
If we increase the brightness of violet light shining on a photosensitive surface we also increases the
A) number of electrons ejected per second. B) kinetic energy of the ejected electrons. C) threshold frequency. D) time lag between the absorption of blue light and ejection of electrons. E) none of the above
Consider two blocks, one made of wood and the other of lead. They have the same dimensions but the lead is much more massive. If they are dropped and fall long enough to reach terminal velocity, which block experiences a larger force from air resistance?
A. The lead block B. The force on each is equal C. The wood block D. It isn't important because air resistance can be ignored
From a stationary position, I observe a moving boxcar, which has a mirror along the front wall, but it is open at the back of the boxcar. I send a flash of light from my flashlight and time the flash of light as it goes to the front of the boxcar and returns to the back of the boxcar. A passenger in the boxcar also times the round trip of the flash of light. Previously I had measured the time
required for the round trip of a flash of light when the boxcar was stationary, and I call this the stationary time. Which two times are the same? a. the time recorded on my watch and the previous stationary time b. the time recorded on the passenger's watch and the previous stationary time c. the time recorded on my watch and the time recorded on the passenger's watch d. None of the times are the same.