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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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
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
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."
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)