During the period of one day, the number of high tides at a given location is about __________
Fill in the blank(s) with correct word
two
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Radiation: A sphere of surface area 1.25 m2 and emissivity 1.0 is at a temperature of 100°C. At what rate does it radiate heat into empty space? (? = 5.67 × 10-8 W/m2 ? K4)
A. 7.1 W B. 0.71 mW C. 1.4 kW D. 9.9 mW E. 3.7 W
As the solar nebula contracts it
A) flattens out into the ecliptic plane around the Sun's poles. B) spins faster due to conservation of angular momentum. C) cools due to condensation. D) loses angular momentum. E) reverses it direction of rotation.
The solar system contains about 100 billion stars
Indicate whether the statement is true or false
Where does most star formation occur in the Milky Way today?
A) in the halo B) in the bulge C) in the spiral arms D) in the Galactic center E) uniformly throughout the Galaxy