Three charged particles are positioned in the xy plane: a 50-nC charge at y = 6 m on the y axis, a -80-nC charge at x = -4 m on the x axis, and a 70-nc charge at y = -6 m on the y axis. What is the electric potential (relative to a zero at infinity) at the point x = 8 m on the x axis?
a. +81 V
b. +48 V
c. +5.8 V
d. -72 V
e. -18 V
B
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The Sun's energy comes from ________.
A. its rotation slowing down B. the conversion of mass into energy C. the release of magnetic energy D. meteors and asteroids striking its surface
A satellite moves east, taken as the positive x axis direction, at a speed of 0.5c and a spaceship moves toward it (to the west) at a speed of 0.8c as measured by an observer on the Earth. The speed of the satellite measured by an observer in the spaceship is
a. 8.7c. b. 0.21c. c. ?0.21c. d. 0.93c. e. ?0.93c.
A continuous spectrum is produced by ____
a. atoms that become ionized b. electrons that transfer from a high energy level to a low energy level c. electrons that transfer from a low energy level to a high energy level d. the intensity of agitation of atoms in a hot gas e. the motion of an object toward or away from the observer
Satellite Motion: Suppose our sun had 4 times its present mass but the earth orbited it at the same distance as it presently does. What would be the length of the year on the earth under those conditions?
A. 1/4 as long as the present year B. 1/2 as long as the present year C. the same as the present year D. twice as long as the present year E. four times as long as the present year