Approximately how long does it take light to reach the Earth from the Sun?
a. 1 min
b. 8 min
c. 1 ly
d. 8 ly
e. 1 AU
b
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An ideal gas is allowed to expand adiabatically. Assume the process is reversible. The change in entropy is
a. 0 b. nR ln (V2/V1) c. nR ln (T2/T1) d. kn ln (V2/V1) e. kn ln (T2/T1)
Areas always have dimensions ____ while volumes always have dimensions ____
a. m2, m3 b. L2, L3 c. Both a and b are correct. d. No answer is correct because of the "always."
If the primary of a transformer is connected to a dc power source, the transformer would have a voltage output
A) at a higher efficiency than with an ac source. B) the same. C) that is also dc. D) only while being connected or disconnected. E) none of the above
A coulomb is the same as:
A) an ampere/second B) half an ampere ? second2 C) an ampere/meter2 D) an ampere ?second E) a newton ?meter2