Why does a cloud speed up once it starts to collapse?
A: A black hole sucks it in
B: As particles clump together, their gravitational attraction grows
C: The heat makes the cloud particles swirl around
D: All of the above
E: None of the above
Ans: B: As particles clump together, their gravitational attraction grows
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The formula proposed for determining the number of technological civilizations in the Milky Way Galaxy with which we might communicate, is known as the _______________
Fill in the blank(s) with correct word
Latent Heats: The figure shows a graph of the temperature of a pure substance as a function of time as heat is added to it at a constant rate in a closed container. If LF is the latent heat of fusion of this substance and LV is its latent heat of vaporization, what is the value of the ratio LV/LF?
A. 5.0 B. 4.5 C. 7.2 D. 3.5 E. 1.5
At apogee, the Moon is at its farthest from the Earth and thus appears larger than normal. Because of this, it can produce total solar eclipses, but not annular solar eclipses
Indicate whether the statement is true or false
At the center of the Sun, nuclear fusion converts hydrogen into
A) radiation and elements such as carbon and nitrogen. B) helium, gamma rays, and neutrinos. C) hydrogen compounds such as methane. D) radioactive elements such as uranium and plutonium. E) molecular hydrogen.