According to Einstein’s theory of special relativity, a stationary observer measures
A. a shorter length of an object than a moving observer measures
B. a longer length of an object than a moving observer measures
C. the same length of an object than a moving observer
measures
B. a longer length of an object than a moving observer measures
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Under what circumstances would a nonzero vector lying in the xy plane have components that are equal in magnitude?
1.This can never happen. 2.Always. Components of vectors are always equal in just two dimensions. 3.Only when the vector lies on the x- or y-axes (0°, 90°, 180°, or 270°). 4.Only when the vector lies 45° from the x- or y-axes (45°, 135°, 225°, or 315°).
When a curve is properly banked a passenger in a car traveling on it at the designed speed does not feel a lateral force
Indicate whether the statement is true or false
Which of the following best explains why nuclear fusion requires bringing nuclei extremely close together?
A) Nuclei normally repel because they are all positively charged and can be made to stick only when brought close enough for the strong force to take hold. B) Nuclei are attracted to each other by the electromagnetic force, but this force is only strong enough to make nuclei stick when they are close together. C) Nuclei have to be hot to fuse, and the only way to get them hot is to bring them close together. D) Fusion can proceed only by the proton—proton chain, and therefore requires that protons come close enough together to be linked up into a chain.
A general principle of ionic compound formation is that the total ionic charge in the formula unit must be
a. 0. b. no greater than that of the metal ion. c. between +4 and –4. d. no less than that of the nonmetal ion.