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JEE Main 2022 Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main 2022

A metre scale is balanced on a knife edge at its centre. When two coins, each of mass 10 g are put one on the top of the other at the 10.0 cm mark the scale is found to be balanced at 40.0 cm mark. The mass of the metre scale is found to be kg. The value of x is .

Answer: 6

Solution

Let the scale have mass M, with its centre of mass at the 50 cm mark. The scale balances at the 40 cm mark with the coins (0.02 kg) at the 10 cm mark, which is 30 cm from the knife

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Question ID VK-024099