What type of galaxies do astronomers believe to be the most common?
a. elliptical
b. spiral
c. irregular
d. Astronomers have no idea which type of galaxy is most common.
a
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When the distance between two charges is halved, the electric force between the charges
A) quadruples. B) doubles. C) is half. D) is reduced by one-quarter. E) none of the above
In an eclipsing binary, the longer the stages of the eclipse take, the ________ the star
Fill in the blank(s) with correct word
The energy of a ball rolling up an inclined plane is an example of both kinetic and gravitational potential energy
a. True b. False Indicate whether the statement is true or false
2 waves traveling in opposite directions on a rope meet and undergo complete destructive interference. Which of the following best describes the waves a moment after the waves meet and coincide?
a. The waves no longer exist. b. The waves continue unchanged. c. The waves reflect and travel backward. d. A single wave continues along the rope.