An explosion occurs 34 km away. Since sound travels at 340 m/s, the time it takes for the sound to reach you is
a. 20 s
b. 10 s
c. 1 s
d. 0.1 s
e. more than 20 s
Answer: e. more than 20 s
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A(n) ____ is a collection of 105 to 106 stars in a region 10 to 30 pc in diameter. The stars in the collection tend to be more than 109 years old and mostly yellow and red stars
a. Herbig Haro object b. globular cluster c. open cluster d. giant cluster e. supernova
The "Grand Tour" of all four jovians was conducted by:
A) Galileo. B) Cassini. C) Pioneer 11. D) Voyager 1 and 2 both. E) Voyager 2.
The Sun's habitable zone
A) extends from some place a little beyond the orbit of Venus to some place near the orbit of Mars. B) consists only of Earth, since Earth is the only planet known to be inhabited. C) extends from the orbit of Earth to the orbit of Jupiter. D) extends from just beyond the orbit of Mercury to just beyond Earth's orbit.
What is the speed of sound in air at freezing temperature?
A) 331 mph B) 650 m/s C) 331 m/s D) 650 mph E) 1100 m/s