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Pinochet, Jorge – Physics Education, 2019
Given the great interest that black holes arouse among non-specialists, it is important to analyse misconceptions related to them. According to the author, the most common misconceptions are that: (1) black holes are formed from stellar collapse; (2) they are very massive; (3) they are very dense; (4) their gravity absorbs everything; and (5) they…
Descriptors: Astronomy, Misconceptions, Physics, Secondary School Science
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Chaudhuri, S. – Physics Education, 2019
In this paper, we derive an equation for the distance covered by a free-falling body as a function of time valid for any arbitrary distance. The equation, interestingly, yields exactly the time according to the Kepler's third law in the limiting case of very large distance compared to the radius of the Earth. The equation, of course, reduces to…
Descriptors: Physics, Science Instruction, Earth Science, Scientific Principles