A system consisting of a negatively-charged particle and an electric field
a. gains potential difference and kinetic energy when the charged particle moves in the direction of the field. b. loses electric potential energy when the charged particle moves in the direction of the field. c. gains kinetic energy when the charged particle moves in the direction of the field. d. gains electric potential energy when the charged particle moves in the direction of the field. e. gains potential difference and electric potential energy when the charged particle moves in the direction of the field.
D
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Buoyancy: A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?
A. It goes up. B. It goes down. C. It does not change. D. It cannot be determined without knowing the volumes of the two pieces of wood.
In the figure below, the current is measured with the ammeter on the right side of the circuit diagram. When the switch is closed, the reading on the ammeter
The fundamental force underlying all chemical reactions is
A) gravitational. B) nuclear. C) centripetal. D) electrical. E) none of the above
Suppose that Earth's atmosphere had no greenhouse gases. Then Earth's average surface temperature would be
A) about the same as it is now. B) slightly cooler, but still above freezing. C) well below the freezing point of water. D) slightly warmer, but still well below the boiling point of water.