Toasters have wires in them that heat up to warm the items placed inside. For the toaster to work properly, these wires must
A. be connected to a tiny voltage.
B. have more resistance than the power cord.
C. be connected to a very large voltage.
D. have less resistance than the power cord.
Answer: B
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Iron absorption lines that occur in the solar spectrum indicate that iron exists in the solar
A) atmosphere. B) surface. C) interior. D) none of the above
A fish's eye is well-suited to seeing under water, but what can you say about his vision if he is taken out of water?
A) His acuity (sharpness of vision) would be greater. B) He would suffer from astigmatism. C) He would be nearsighted. D) He would be farsighted. E) His vision would be limited to a cone of half-angle of about 49°.
How does the range of an exchange force depend on the mass of the exchange particle?
A) The range is longer for a massive exchange particle than for a light exchange particle. B) The range is shorter for a massive exchange particle than for a light exchange particle. C) The range does not depend on the mass of the exchange particle.
The symbol G is used to represent
a. the acceleration of gravity. b. the universal gravitational constant. c. grams. d. gravity. e. none of the above.