Kepler deduced his laws of planetary motion once Newton had published his universal law of gravitation
Indicate whether the statement is true or false
FALSE
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In stars, helium can sometimes be fused into carbon and heavier elements (in their final stages of life). Why didn't the same fusion processes produce carbon and heavier elements in the early universe?
A) By the time stable helium nuclei had formed, the temperature and density had already dropped too low for helium fusion to occur. B) Temperatures in the early universe were never above the roughly 100 million Kelvin required for helium fusion. C) Helium fusion occurred, but the carbon nuclei that were made were later destroyed by the intense radiation in the early universe. D) No one knows—this is one of the major mysteries in astronomy.
The axes on a Hertzsprung-Russell (H-R) diagram represent ________
A) mass and radius B) luminosity and surface temperature C) mass and luminosity D) luminosity and apparent brightness
A bar magnet is attached solidly to a frictionless surface and its length is aligned with the x axis. To the right of the first magnet a short distance away is a second bar magnet with its center placed on the x axis and its length perpendicular to the x axis. The second magnet is free to move. Once placed in position at rest, which best describes the initial motion of the second magnet?
a. The magnet will move away from the fixed magnet. b. The magnet will not move. c. The magnet will move toward the fixed magnet. d. The magnet will start to rotate.
If someone tells you they have a sample of niobium-90, can you tell how many neutrons are in the nucleus?
a. Yes, there are 41 neutrons. b. Yes, there are 90 neutrons. c. Yes, there are 49 neutrons. d. No, more information must be given. e. No, there is no such thing as "niobium.".