If we know that a nonzero net force is acting on an object, which of the following must we assume regarding the object's condition? The object is:
a. at rest.
c. being accelerated. b. moving with a constant velocity.
d. losing mass.
C
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One of the most important features that must be explained by models during the formation of the galaxy is the ____
a. formation of spiral arms b. differences in age and metallicity of stars, especially in the halo c. formation of the central supermassive black hole d. accumulation of dark matter in the corona e. importance of spiral arms to star formation
Size of the Nucleus: What is the approximate nuclear radius of an isotope of sodium with 11 protons and 12 neutrons?
Fill in the blank(s) with the appropriate word(s).
A solid nonconducting sphere of radius R carries a charge Q distributed uniformly throughout its volume. At a certain distance r1 (r1 < R) from the center of the sphere, the electric field has magnitude E
If the same charge Q were distributed uniformly throughout a sphere of radius 2R, the magnitude of the electric field at the same distance r1 from the center would be equal to A) E/8. B) E/2. C) 2E. D) 8E. E) E.
If you are whirling a ball on a string and you suddenly cut the string, what happens?
a. The ball falls immediately to the ground. b. The ball keeps traveling in the same circle. c. The ball goes off in some random straight line. d. The ball goes off in a straight line based on where it was heading when the string was cut. e. The ball goes off in a straight line path directed radially outward from the center of the circle.