An object more massive than the Sun, but roughly the size of a city, is a
A) supernova remnant.
B) white dwarf.
C) brown dwarf.
D) neutron star.
E) red dwarf.
D
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From where did the oxygen in the Earth's atmosphere originate?
A) photosynthesis from plant life and single-celled organisms B) atmospheric bombardment C) outgassing from volcanoes D) chemical reactions between gas in the upper atmosphere and the solar wind E) oxidation of surface rocks
How far away can two point sources of wavelength 500 nm be if they are just resolved in a telescope of aperture 1.5 cm?
A. 25 km B. 12 km C. 90 m D. 12 m E. more information is needed
For the triangular micro heat pipe arrangement shown in Figure 9-41, estimate the permeability of the wick.
A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N. What is the magnitude of the second charge? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 25 C B) 1.0 C C) 10 nC D) 0.025 C E) 25 nC