A method of expressing the accuracy of measured quantities is
a. metric prefixes.
b. derived units.
c. significant figures.
d. conversion factors.
c
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A 5.00 kg mass is located at (2.00 m, 0.00 m, 0.00 m) and a 3.00 kg mass is located at (0.00 m, 4.00 m, 0.00 m). The center of gravity of the system of masses is
A. (1.25 m, 1.25 m, 0). B. (1.50 m, 1.50 m, 0). C. (1.25 m, 1.50 m, 0). D. (1.50 m, 1.25 m, 0). E. (1.00 m, 1.00 m, 0).
There are three types of collapsed, burned-out stars: black holes, neutron stars, and
A) supernova. B) quasars. C) red giants. D) X-ray stars. E) white dwarfs.
Cart A with momentum p (in magnitude) collides with cart B at rest and rebounds. What can you say about the momentum of cart B after the collision?
The balloon and the magazine shown in this figure are both electrical insulators. Suppose the magazine was replaced by an uncharged metal sheet of the same size as the magazine. The balloon would:
a. be repelled by the metal sheet. b. be attracted by the metal sheet. c. be unaffected by the metal sheet. d. have all electrical effects neutralized by the presence of the metal. e. acquire the opposite charge because of the metal.