A disk, a hoop, and a solid sphere are released at the same time at the top of an inclined plane. They all roll without slipping. In what order do they reach the bottom?
A) disk, hoop, sphere
B) hoop, sphere, disk
C) sphere, disk, hoop
D) hoop, sphere, disk
E) hoop, disk, sphere
C
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Applications to Astronomy: A Hertzsprung-Russell diagram shows stars on a plot of
A. apparent brightness vs. temperature. B. luminosity vs. temperature. C. luminosity vs. distance. D. magnitude vs. apparent brightness.
Which statement best describes what used to be called the solar neutrino problem?
A) Theoretical models predict that neutrinos should be produced in the Sun, but no neutrinos had ever been observed to be coming from the Sun. B) Solar neutrinos were detected in fewer numbers than predicted by theoretical models. C) Theoretical models did not predict the production of neutrinos by the Sun, yet solar neutrinos were detected. D) Theoretical models predicted that all solar neutrinos should be destroyed before they arrive at Earth, yet neutrinos were detected on Earth. E) The neutrinos that were being detected from the Sun had much smaller masses than theoretical models could account for.
Rays with the shortest wavelengths have the
A) highest frequencies and energies. B) lowest frequencies and energies. C) lowest frequencies but highest energies.
Two point charges of +1.0 ?C and -2.0 ?C are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) +36 mJ B) +18 mJ C) -36 mJ D) 0 mJ E) -18 mJ