JEE Main 2004 Physics question
The bob of a simple pendulum executes simple harmonic motion in water with a period , while the period of oscillation of the bob is in air. Neglecting frictional force of water and given that the density of the bob is . What relationship between and is true?
Answer: (3)
Solution
In water the buoyant force reduces the effective gravity: $ = g(1 - ) = g(1 - ) =
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