Sound is produced by a pipe that is closed on one end. The standing waves must have
A. no antinodes in the pipe.
B. just one node in the pipe.
C. at least one node in the pipe.
D. at most one antinode in the pipe.
Answer: C
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Three small objects are positioned as follows: the 2.0-kg object at (0.0 m, 0.0 m), the 2.0-kg object at (2.0 m, 0.0 m), and the 4.0-kg object at (2.0 m, 1.0 m). Determine the coordinates of the center of mass of this system
A) (0.50 m, 1.5 m) B) (1.5 m, 0.50 m) C) (2.5 m, 1.5 m) D) (2.5 m, 0.50 m)
Rank the following five capacitors in the order of the energy they store
(a) a 20-µF capacitor with a 4-V potential difference between its plates (b) a 30-µF capacitor with charges of magnitude 90 µC on each plate (c) a capacitor with charges of magnitude 80 µC on its plates, differing by 2 V in potential, (d) a 10-µF capacitor storing energy 125 µJ (e) a capacitor storing energy 250 µJ with a 10-V potential difference
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A. 34 J
B. 45 J
C. 52 J
D. 64 J
E. 75 J
Seyfert galaxies____
a. often have unique shapes spectra suggesting fast-moving, hot gas b. have no gas and dust in their spiral arms c. are associated with pairs of radio sources d. have visible jets of matter coming from their cores e. are always isolated galaxies