A solid aluminum cube rests on a wooden table in a region where a uniform external electric field is directed straight upward. What can we say concerning the charge on the top surface of the cube?
A) The top surface is neutral.
B) The top surface is charged negatively.
C) The top surface is charged positively.
D) The top surface's charge cannot be determined without further information.
C
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The electromagnetic radiation that causes tanning:
a. can produce cancer. b. rarely passes through glass windows. c. is absorbed by ozone. d. is all of the above.
Radioactive Decay: The decay rate of a radioactive sample decreases from 175 kBq to 12.4 kBq in 18.3 s. What is the decay constant of this sample?
Fill in the blank(s) with the appropriate word(s).
Think of Bernoulli's equation as it pertains to an ideal fluid flowing through a horizontal pipe. Imagine that you take measurements along the pipe in the direction of fluid flow. What happens to the sum of the pressure and energy per unit volume?
a. It increases as the pipe diameter increases. b. It decreases as the pipe diameter increases. c. It remains constant as the pipe diameter increases. d. No choices above are valid.
The maximum mass of a white dwarf is ________
A) limitless; there is no theoretical limit to the maximum mass of a white dwarf B) about the mass of our Sun C) about 1.4 times the mass of our Sun D) about 3 times the mass of our Sun