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ipho_BUL81Exp

ipho_BUL81Exp - XII International Physics Olympiad Varna...

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XII International Physics Olympiad Varna, Bulgaria, July 1981 The problems and the solutions are adapted by Miroslav Abrashev University of Sofia, Faculty of Physics, 5 James Bourchier Blvd., 1164 Sofia, Bulgaria Reference : O. F. Kabardin, V. A. Orlov, in “International Physics Olympiads for High School Students”, ed. V. G. Razumovski, Moscow, Nauka, 1985. (In Russian). The Experimental Problem Materials and Instruments: elastic rubber cord (the length of free cord is l 0 = 150 mm), vertically hanged up to a stand, set of weights from 10 g to 100 g, pan for the weights with mass 5 g, chronometer, ruler, millimeter (scaled) paper. Note: The Earth Acceleration is g = 10 m/s 2 . The mass of the rubber cord can be neglected. Make the following study: 1. Load the rubber cord with weights in the range 15 g to 105 g. Put the data obtained into a table. Make a graph (using suitable scale) with the experimentally obtained dependence of the prolongation of the cord on the stress force F .

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ipho_BUL81Exp - XII International Physics Olympiad Varna...

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