Electric Field of Point-Charges: Three equal negative point charges -q are placed at three of the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the center of the square?
A. A
B. B
C. C
D. D
Answer: C
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An umbrella tends to move upwards on a windy day principally because
A) trapped air under the umbrella, warms, and rises. B) buoyancy increases with increasing wind speed. C) air pressure is reduced over the curved top surface. D) all of the above
Distinguish between stress and strain
What will be an ideal response?
Diagrams like this one are commonly used in discussions of seasons and they can be quite useful. However, this diagram greatly exaggerates
A) the size of Earth relative to the size of Earth's orbit around the Sun. B) the size of the Sun relative to the size of Earth's orbit around the Sun. C) the amount by which Earth's orbit differs from a perfect circle. D) all of the answers listed. E) only the first and third choices.
A protostar of one-half solar mass would reach the main sequence in ________ time than it took our own Sun
Fill in the blank(s) with correct word