Capacitors in Combination: Two capacitors are connected as shown in the figure, with C1 = 4.0 µF and C2 = 7.0 µF. If a voltage source V = 90 V is applied across the combination, find the potential difference across C1.
A. 57 V
B. 36 V
C. 60 V
D. 9.0 V
Answer: A
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Consider a rock interacting gravitationally with the earth, and choose the interaction’s potential energy to be zero if the rock is at the ground level. A person standing at the bottom of a well throws the rock vertically upward from 20 m below ground level. The rock makes it all the way up to 1 m below ground level before falling back into the well. The total energy of the rock–earth system is
A. negative. B. zero. C. positive (in this particular case). D. positive (because energy is always positive). E. The answer depends on information not specified.
Weigh yourself on a weighing scale and the scale shows your normal weight. If you carefully stand on tiptoes, the scale reading will be
A) slightly more. B) slightly less. C) about half as much. D) no different.
Due to increasing amounts of terrestrial radio noise, in the future SETI telescopes may be placed
A) on the tops of tall mountains B) in near-Earth orbit C) on the far side of the Moon D) in remote desert locations
Most meteors seen as shooting stars are about the size of
A) grains of sand. B) baseballs. C) small buildings. D) very large buildings. E) small continents.