A battery charges a parallel-plate capacitor fully and then is removed. The plates are then slowly pulled apart. What happens to the potential difference between the plates as they are being separated?
A) It increases.
B) It decreases.
C) It remains constant.
D) It cannot be determined from the information given.
A
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The star Vega has an apparent visual magnitude of 0.03 and the star HR 4374 has an apparent visual magnitude of 4.87 . It has been determined that both stars are at the same distance from Earth. What does this information tell us about the two stars?
a. Vega must be closer to Earth than HR 4374. b. Vega must be farther from Earth than HR 4374. c. Vega must produce less energy/second than HR 4374. d. Vega must produce more energy/second than HR 4374. e. Vega will appear fainter to us than HR 4374.
In calculating the lateral magnification from a lens, a negative result means
A) the image is larger than the object. B) the image is smaller than the object. C) the image is directed downward. D) the image is inverted. E) the calculation is incorrect.
Given the distance x that a spring is compressed, what is the potential energy of the spring?
A. 2 kx^2 B. ½ kx C. ½ kx^2 D. 2 kx
ABS is a(n) _________of PAN, BR, and PS.
Fill in the blank(s) with the appropriate word(s).