A 1.50-H inductor is connected in series with a 200-? resistor through an ideal 15.0-V dc power supply and an open switch. How much energy is contained in the inductor 20.0 ms after closing the switch?
A) 5.48 mJ B) 0.910 mJ C) 7.31 mJ D) 3.65 mJ E) 1.83 mJ
D
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As cumulus clouds grow they shade the ground from the Sun. This acts to
A) slow down the heating of the ground surface. B) dissipate cumulus cloud formation. C) slow down convectional lifting. D) slowly cool the ground surface, slowing convectional lifting, and dissipating cloud formation.
A bubble-producing soda is an example of
a. an unsaturated solution. b. a saturated solution. c. a supersaturated solution. d. a completely unsaturated solution.
Which of the following statements correctly describes the relationship between stars and constellations?
a. Only stars close to the ecliptic (the Earth's orbital plane) are located in constellations. b. Every star is located in a constellation. c. Only the brighter stars are in constellations. d. Only those stars that were visible to the ancient Greeks are located in constellations.
What eventually halts the gravitational collapse of an interstellar gas cloud that forms a brown dwarf rather than a true (main-sequence) star?
A) The central object becoming hot enough to sustain nuclear fusion in its core B) Degeneracy pressure caused by the high density of electrons in the core C) Thermal pressure from the high core temperature D) The onset of convection in the object's outer layers