A parallel-plate capacitor is attached to a fixed voltage supply. If the plates are then separated to double the initial value, what happens to the energy stored by the capacitor?
a. It halves, go figure!
b. It stays the same since the volume doubles while the electric field halves.
c. It doubles since the volume between the plates doubles.
d. It quadruples since both the volume and the field double in this case.
a
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Object A is acted on by only object B. The mass of object A is 20.0 kg and its acceleration is 4.00 m/s2 west. Object B is acted on by two forces, the force of object A on object B and another unknown force
If mass of object B is 40.0 kg and the acceleration of object B is 3.00 m/s2 west, what is the unknown force? A) 40 N west B) 120 N west C) 80 N east D) 200 N west E) 80 N west
Suppose that Earth's atmosphere had no greenhouse gases. Then Earth's average surface temperature would be ________
A) well below the freezing point of water B) slightly cooler, but still above freezing C) slightly warmer, but still well below the boiling point of water D) about the same as it is now
Light of colors 1 and 2 are sent through a prism and the rays of light of color 2 bend more. Which of the following is not true?
a. The index of refraction for color 2 is greater than that for color 1. b. The two colors of light have different frequencies associated with them. c. The speed of light for color 2 is greater than that for color 1 in this prism. d. The wavelength for color 1 is different than that for color 2 in this prism.
A small refrigerator freezer, 16 in x 16 in x 18 in outer dimensions, has an inside surface temperature of 10ºF and an outside surface temperature of 80ºF. If the walls are uniformly 3 inches thick, homogeneous, and with thermal properties the same as Styrofoam, estimate the heat transfer through the walls and door of the refrigerator.
What will be an ideal response?