Earth's core is mostly ___________ as indicated by the absence of S waves
a. solid
b. liquid
c. gas
d. solid and gas
e. solid, liquid, and gas
b
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How do we know what happens at the event horizon of a black hole?
A) Physicists have created miniature black holes in the lab. B) Astronomers have sent spacecraft through the event horizon of a nearby black hole. C) Astronomers have analyzed the light from matter within the event horizon of many black holes. D) Astronomers have detected X-rays from accretion disks around black holes. E) We don't know for sure: we only know what to expect based on the predictions of general relativity.
Show that the conservation of mass equation is satisfied by the stream function ? which satisfies
Consider horizontal parallel plates with a fixed potential difference. The upper plate has a voltage difference of 30 V with the lower plate, and they are separated by 3 cm. You move the two plates carefully to a separation of 4 cm. What is the strength of the electric field between the plates?
A. 1000 volts/meter B. 750 volts/meter C. 7.5 volts/meter D. 3000 volts/meter
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.