Identify a true statement about carbonaceous chondrites
A) They contain significant amounts of hydrogen.
B) They have not changed since they formed.
C) They are mostly composed of nonvolatile compounds.
D) They do not provide information about the early Solar System.
B
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In pre-Copernican astronomy, it was almost universally believed that
a. the planets traveled in elliptical orbits about the Earth. b. the center of the universe was the Sun with the Milky Way representing other distant planets. c. the Sun was at the center of the universe. d. the Earth was at the center of the universe. e. None of the above was believed.
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.
Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. Sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. Which one, if either is correct?
a. Beryl, because low thermal conductivity results in low heat transfer. b. Beryl, because low thermal conductivity results in high heat transfer. c. Sapphire, because low thermal conductivity results in low heat transfer. d. Sapphire, because low thermal conductivity results in high heat transfer. e. Neither, because low heat transfer is desirable both in summer and in winter.
Heat is transferred from a substance if it is exposed to something that has a lower temperature
Indicate whether the statement is true or false