Some power plants extract energy from the warm ocean currents. A major disadvantage to these power plants is that
A. the amount of heat released to the environment is unacceptable.
B. the cost of warm ocean water is quite high.
C. the efficiency is quite low.
D. there is no low temperature reservoir.
Answer: C
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The solar nebula theory is NOT able to explain which of the following observed characteristics of the solar system? Another theory would be needed
a. Common direction of rotation of the planets. b. Common direction of revolution of the planets. c. The formation of hydrogen atoms in the solar system from subatomic particles. d. The density of the Jovian planets.
When you touch a piece of ice with your finger, energy flows
A) from your finger to the ice. B) from the ice to your finger. C) both of these D) none of the above
The electric charge of all electrons
A) vary from atom to atom. B) vary from ion to ion. C) are identical.
Photoelectrons are ejected when monochromatic light shines on a freshly-prepared (oxide-free) sodium surface. In order to obtain the maximum increase in the number of electrons ejected per second, the experimenter needs to
a. increase the frequency of the light. b. increase the intensity of the light. c. increase the area illuminated by the light. d. do all of the above. e. do only (b) and (c) above.