Velma, the space woman, is orbiting above Earth's surface in a low-altitude orbit. Does she actually have weight, or is she actually weightless, and why?
A) She actually has weight, because Earth actually is pulling on her with nearly the normal pull of gravity.
B) She is weightless because she is away from the pull of Earth's gravity.
C) She is weightless because she is falling freely around the earth.
D) She is weightless because she is in a vacuum.
E) She actually has weight, because her weight remains the same no matter where she goes in the universe.
A
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How many arcseconds are in 1°?
A) 60 B) 360 C) 3,600 D) 100 E) 10,000
Suppose two equipotential surfaces are the planes x = 3 m and x = 5 m. If the potential at the x = 3 m surface is 10 V and the potential at the x = 5 m surface is 50 V, what is the magnitude of the electric field between the two surfaces?
a. 40 N/C b. 20 N/C c. 15 N/C d. 10 N/C
The expansion rate of the Universe is
A) increasing. B) decreasing. C) constant. D) different in different directions. E) independent of time.
Eternal Inflation refers to
A) the possibility that our universe is only a patch of a greater universe and that the process of universe spawning will continue forever. B) the observation that cosmic inflation could eventually curve back in on itself, causing its opposite: the compression of space. C) cosmic inflation inflating itself such that its own inflation is self-generating. D) the presence of a distinct beginning of time.