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
B) Degeneracy pressure caused by the high density of electrons in the core
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According to the following figure, as you increase in altitude in Earth's lower atmosphere, the atmospheric pressure ________ dramatically at a(n) _________ rate.
a. increases; increasing b. increases; decreasing c. decreases; decreasing d. decreases; increasing e. decreases; constant
If the force of gravity exerted on the Sun by Earth is the same as the force exerted by Earth on the Sun, why does Earth orbit the Sun, and not the other way around?
A. They each orbit around the geometric center of the system. B. Earth is less massive, and is accelerated more by the gravitational force and moves faster. C. Planets, by definition, orbit the Sun, and not the other way around. D. The combined gravitational forces of all the planets keeps the Sun at the center of the Solar System. E. None of these choices is correct.
Discuss the extinction of the dinosaurs, relating it to an astronomical event
What will be an ideal response?
A beam of light of wavelength 610 nm passes through a slit that is 1.90 µm wide. At what the angle away from the centerline does the first dark fringe occur?
A) 39.9° B) 18.7° C) 11.4° D) 12.2° E) 9.35°