What kind of gas cloud is most likely to give birth to stars?
A) a hot, dense gas cloud
B) a cold, dense gas cloud
C) a cold, low-density gas cloud
D) a hot, low-density gas cloud
B
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A cylindrical metal wire at room temperature is carrying electric current between its ends. One end is at potential VA = 50 V, and the other end is at potential VB = 0 V. Rank the following actions in terms of the change that each one separately would produce in the current from the greatest increase to the greatest decrease. In your ranking, note any cases of equality
(a) Make VA = 150 V with VB = 0 V. (b) Adjust VA to triple the power with which the wire converts electrically transmitted energy into internal energy. (c) Double the radius of the wire. (d) Double the length of the wire. (e) Double the Celsius temperature of the wire.
1.b > c > a > e > d 2.d > a > c > b > e 3.c > a > b> e > d 4.a > c > d > e > b 5.None of these.Astronomers have decided that, rather than being a planet, Pluto is really just a large member of
A) the asteroid belt. B) the Kuiper belt. C) the Oort cloud. D) the moon system around Neptune. E) an extrasolar planetary system.
A particle with ____________ obeys the Pauli exclusion principle
a. zero rest mass b. very high energy c. half-integral spin d. integral spin e. charm
Olber's paradox is explained by the fact that the Universe is neither static nor infinite in age
a. True b. False Indicate whether the statement is true or false