Coulomb's Law: Four point charges of equal magnitude but with varying signs are arranged on three of the corners and at the center of the square of side d as shown in the figure. Which one of the arrows shown represents the net force acting on the center charge?
A. A
B. B
C. C
D. D
Answer: A
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A. exactly 180 degrees. B. less than 180 degrees. C. more than 180 degrees.
Proper time interval is the
A. time kept by the observatory in Greenwich, England B. time measured by any observer with a calibrated clock C. elapsed time between two events measured in a frame of reference in which the two events occur at the same time D. elapsed time between two events measured in a frame of reference in which the two events occur at the same point in space
The changing shapes of constellations in the night sky is caused by
A) the rotation of our planet about its axis. B) the revolution of our planet around the Sun. C) the movement of our planet within the Milky Way. D) the tilt of Earth's axis.
The second step in the precipitation-hardening process is to _________the alloy to maintain a uniform distribution of atoms in the grains at low temperature.
Fill in the blank(s) with the appropriate word(s).