Torque: As shown in the figure, a given force is applied to a rod in several different ways. In which case is the torque about the pivot P due to this force the greatest?
A. 1
B. 2
C. 3
D. 4
E. 5
Answer: A
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How might Mars's weakened magnetic field have allowed for major changes in its climate?
A) Atmospheric gases were left vulnerable to being stripped into space by solar wind particles. B) The heat combined with the magnetic field, and disappeared with it. C) Mars has actually heated up since the magnetic field weakened, since the solar rays no longer have such a dense layer to get through. D) They are completely unrelated; there is no possible influence.
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Answer the following statement true (T) or false (F)
Hydrocarbon fuels come from
A) the original geological processes that formed planet Earth billions of years ago. B) lava flows from volcanoes that erupted millions of years ago. C) Disneyland. D) hydrocarbon ores that are mined and then milled in order to extract the small fraction of hydrocarbon in them. E) the remains of plants and animals that died millions of years ago.
RLC Circuits: The figure shows a series ac circuit. The inductor has a reactance of 60 ? and an inductance of 150 mH. A 50-? R and a capacitor C whose reactance is 90 ? are also in the circuit, and the rms current in the circuit is 1.5 A. What is the rms voltage of the source? 
A. 87 V B. 84 V C. 81 V D. 78 V E. 75 V