A visual defect wherein a person can see distant objects clearly but not nearby objects is called
a. dispersion.
b. destructive interference.
c. farsightedness.
d. nearsightedness.
c
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Which of the following statements about quasars is not correct?
A. Their cores are extremely large, probably several thousand light-years across. B. Their spectra have the largest redshifts observed. C. They are probably the most distant observable objects. D. They have abnormally high luminosities. E. Sometimes they appear in pairs, due to gravitational lenses formed by intervening galaxies.
How does the study of quasars reveal information of the history of the universe?
a. Typical quasars are very distant so we can view how galaxy evolution occurred in the past. b. Quasars contain stars of all ages. c. Quasars typically act as host galaxies for gravitational lensing. d. Quasars generate their energy in very small volumes of space
Could acupuncture be responsible for the patients' recovery?
A) No. If there is no plausible mechanism of action, then clearly acupuncture cannot be responsible for their healing. B) Yes. Just because we don't understand the mechanism doesn't mean the process does not occur. C) No. Acupuncture is not accepted by most medical doctors, therefore it isn't effective. D) Yes. If the patients got better, then the acupuncture must be effective.
If a net external force acts on a system, what will change?
a. The sum of the momenta of all objects in the system. b. The momentum of no more than one object in the system. c. The sum of the magnitudes of each momentum. d. The momentum of exactly one object in the system. e. The momenta of all but one of the objects in the system.