Briefly describe our Galaxy
What will be an ideal response?
A galaxy is a great cloud of stars, gas, and dust bound together by the combined gravity of all the matter. In the night sky, you see our Galaxy from the inside as a great, cloudy band of stars ringing the sky as the Milky Way, and our Galaxy is called the Milky Way Galaxy. Astronomers use evidence to guide their explanations as they envision what our Galaxy looks like. Artists can then use those scientific descriptions to create a painting. Our Sun would be invisible in such a picture, but if you could see it, you would find it about two-thirds of the way from the center to the edge.
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The number of protons in a neutral atom is balanced by an equal number of
A) electron shells that surround the nucleus. B) neutrons in the nucleus. C) orbital electrons. D) none of the above
During an isothermal process, 5.0 J of heat is removed from an ideal gas. How much work does the gas do during this process?
A) 5.0 J B) 10 J C) -5.0 J D) 2.0 J E) 0.00 J
Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. How far has the heavier astronaut moved when the lighter astronaut has moved 12 m?
A) 9.0 m B) 21 m C) 7.0 m D) 16 m E) 12 m
The rotation of the Sun's photosphere is
a. fastest at the equator, slower at mid-latitudes, and slowest near the poles. b. slowest at the equator, faster at mid-latitudes, and fastest near the poles. c. fastest at the equator, slowest at mid-latitudes and the poles which travel at the same speed. d. the same regardless of latitude.