If the height of water behind a dam is increased by a factor of two, then the maximum kinetic energy of the water at the bottom of the dam will increase by a factor of _____
a. one b. two c. four d. zero
b
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A car accelerates uniformly. It starts from rest and reaches 36 m/s after 6.0 seconds. During the 6.0 seconds it has traveled ________ m.
Fill in the blank(s) with the appropriate word(s).
A dielectric material such as paper is inserted between the plates of a capacitor as the capacitor holds a fixed charge on its plates. What happens to the electric field between the plates as the dielectric is inserted?
A) There is no change in the field. B) The field becomes stronger. C) The field becomes weaker. D) The field reduces to zero.
A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held with its south pole downward, vertically above the center of the coil. The magnet is released from rest and falls toward the coil
As viewed from above, you can say that, as it falls, the magnet induces A) counterclockwise current in the loop. B) clockwise current in the loop. C) no current in the loop. D) an emf but no electric current in the loop. E) Not enough information is provided.
Which of the following best describes how the Drake equation is useful?
A) It tells us what wavelengths of light will be most useful to examine in the search for extraterrestrial intelligence. B) It allows us to calculate the masses of planets orbiting other stars. C) It has allowed us to determine the number of civilizations in the Milky Way Galaxy. D) It helps us understand what we need to know in order to determine the likelihood of finding other civilizations.