Predict a value for thermal conductivity of liquid ethyl alcohol at 300 K. Use the equation suggested by Bridgman’s equation (2-6).
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Linus claims that the added gravitational force of neutrons holds the particles in a nucleus together. Linnea says that they stick together because they lose their electric charge when they form a nucleus. Which one, if either, is correct, and why?
a. Linus, because more particles exert gravitational forces on one another than exert electromagnetic forces. b. Linus, because the numerical magnitude of G/ke is 7.42 × 10^-21. c. Linnea, because the numerical magnitude of G/ke is 7.42 × 10^-21. d. Both, because electric charge is lost and then gravity holds the nucleus together. e. Neither, because gravity is not lost, and the numerical magnitude of ke/G is 1.35 × 10^20.
Briefly summarize current knowledge about the term Np in the equation Number of Civilizations = Np × flife × fcivilization × fnow
What will be an ideal response?
A boat is floating in a small pond. The boat then sinks so that it is completely submerged. What happens to the level of the pond?
A. It increases. B. It decreases. C. It stays the same. D. In some cases it would decrease, in others it would stay the same. E. In some cases it would increase, in others it would stay the same.
A ball tossed vertically upward reaches its highest point and then falls back to its starting point. During this up-and-down motion the acceleration of the ball is always
A) in the direction of motion. B) opposite its velocity. C) directed upward. D) directed downward.