In stellar astronomy, _____ states that the weight on each layer of a star is balanced by the pressure in that layer
A) the law of conservation of mass
B) the law of conservation of energy
C) the law of hydrostatic equilibrium
D) the law of energy transport
C
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The evidence for recent geological activity on Pluto came as a surprise to most scientists, because they did not expect Pluto to retain enough heat to drive such activity. Which of the following best explains why Pluto is so geologically active despite its small size?
A. The activity is driven by tidal heating caused by Pluto’s moons. B. Pluto’s tall mountains built of water ice must be unstable, and when they collapse they can cause geological activity C. The activity is driven by heat from the many impacts that occur in the Kuiper belt. D. The activity involves nitrogen ice, so Pluto does not need much heat to cause this ice to undergo change. E. The activity is driven by the heat of a subsurface ocean.
An electrical motor spins at a constant If the armature radius is what is the acceleration of the outer edge of the armature?
A) 2403 m/s2 B) 844.4 m/s2 C) 241,100 m/s2 D) 84.40 m/s2
Compare the differential rotation rates of the four jovian planets
What will be an ideal response?
Two objects made from the same material have different masses and different initial temperatures as shown. If the bodies are placed in thermal contact, the final equilibrium temperature is most nearly: