A battery has an internal resistance of 4.0 ?. Which of the following load resistors would have the most power delivered to it when connected across the battery?
A. 1.4 ?
B. 2.0 ?
C. 4.0 ?
D. 8.0 ?
E. 16 ?
Answer: C
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The study of astronomy involves
a. space. b. energy. c. matter. d. all of these.
A 100 kg mass is blown apart into a 50.0 kg piece and a 50.0 kg piece. After the blast, the two masses are moving apart with a relative velocity of 100 m/s. The total kinetic energy after the explosion is
a. 
b. 
c. 
d. 
e. 
If scientists excavate two fossils at the Grand Canyon, one of which was found at a much deeper rock layer than the other, what can we assume about the fossils?
A) The fossil found in a deeper layer is older. B) The fossil found in a deeper layer is younger. C) The fossil found in a deeper layer is not as well-preserved. D) The fossil found in a deeper layer has a higher carbon-12 abundance.
Rather than being a planet, Pluto is really just a large member of
A) the Kuiper belt. B) an extrasolar planetary system. C) the Oort cloud. D) the moon system around Neptune. E) the asteroid belt.