At a science fair, a student will use Maxwell's disk [IT WAS IN THE ENEM]
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You can't miss this energy conservation question!! (ENEM2019) At a science fair, a student will use Maxwell's disk (yo-yo) to demonstrate the principle of energy conservation. The presentation will consist of two stages. Stage 1 - the explanation that, as the disk descends, part of its gravitational potential energy is transformed into translational kinetic energy and rotational kinetic energy; Stage 2 - the calculation of the disk's rotational kinetic energy at the lowest point of its trajectory, assuming the conservative system. When preparing the second stage, he considers the acceleration of gravity equal to 10 ms–2 and the linear velocity of the disk's center of mass negligible compared to the angular velocity. Then, he measures the height of the top of the disk in relation to the ground at the lowest point of its trajectory, obtaining 1/3 of the height of the toy's rod. The size specifications of the toy, that is, length (L), width (W) and height (H), as well as the mass of its metal disk, were found by the student in the manual clipping illustrated below. The result of the calculation in step 2, in joules, is: a) 4.10 x 10–2 b) 8.20 x 10–2 c) 1.23 x 10–1 d) 8.20 x 104 e) 1.23 x 105 If you need to learn how to solve the biggest doubt in electrical engineering, watch this video [HOW TO KNOW] Resistors in Series or Parallel! • [HOW TO KNOW] Resistors in Series or Parallel...
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