What are interstellar grains?
A. the material out of which exoplanets are formed
B. droplets of material that have condensed out of the Solar nebula
C. tiny dust particles that are part of interstellar clouds
D. leftover fragments of planetesimals that are blown out of the Solar System
Answer: C
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The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 · K4. A) 60.3 W B) 62.6 W C) 65.7 W D) 68.4 W E) 64.8 W
The root-mean-square speed (thermal speed) for a certain gas at 100°C is 0.500 km/s. If the temperature of the gas is now increased to 200°C, the root-mean-square (thermal) speed will be closest to
A) 563 m/s. B) 634 m/s. C) 707 m/s. D) 804 m/s. E) 1000 m/s.
Divergent boundaries are areas of
A) tensional forces that stretch the crust and generate a spreading center. B) compressional forces that crunch the crust and generate a spreading center. C) compressional forces that crunch and shorten the crust by folding and faulting. D) plate collision.
Why is heat of vaporization, heat of fusion, and heat of sublimation accounted as energy generation in the usual derivation of energy balance equations?
What will be an ideal response?