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Answer on Mechanics | Relativity Question for Ladarjournae Colebrooke

Question #5081
In an experiment to find the mass of a metre rule using the principle of moments, a student first found the centre of mass of the rule to be at the 50cm mark. She then pivoted the rule at the 40cm mark and found a balance for a 200g mass of Plasticine when it was suspended at the 35cm mark. Show the calculation she should now carry out to find the mass of the rule. What was the mass of the rule?
Expert's answer
5*200 = 10*Х => X = 100 g

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