Three masses are positioned at the following coordinates: 3.0 kg at (3,2); 4.0 kg at (0,-1); and 5.0 kg at (5,-7). What are the coordinates of the center of mass of the system?
What will be an ideal response?
(2.8 , -2.8)
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Standing Waves on a String: A 4.0-g string is 0.39 m long and is under tension. The string vibrates at 600 Hz in its third harmonic. What is the tension in this string?
A. 250 N B. 200 N C. 160 N D. 290 N E. 340 N
Venus is much hotter than the Earth. Which of the following explains most of this temperature difference?
A) Venus has much more carbon dioxide in its atmosphere. B) Venus's clouds have a very high reflectivity. C) Venus rotates backward compared to its orbital rotation. D) The sunlight reaching Venus is more concentrated because of its closer distance to the Sun.
What do moonquakes reveal about the Moon?
A) It has a strong magnetic field generated by a large molten core. B) It has a differentiated core, displaced away from us by the Moon's rotation. C) Its small, partially molten core has been pulled toward us by tidal forces. D) The Moon has been geologically dead throughout its entire history. E) The Moon is quite active, almost as much so as Jupiter's moon Io.
If Q = 80 nC, a = 3.0 m, and b = 4.0 m in the figure, what is the magnitude of the electric field at point P?
A. 45 N/C B. 70 N/C C. 29 N/C D. 47 N/C E. 92 N/C