A rectangular block of mas M and cross-sectional area A floats on a liquid of density ρ . It is given a small vertical displacement from equilibrium; it starts oscillating with frequency n then

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​ F restroing ​ = ( − ρ ( A x ) g ) = ma ⇒ a − ( g m ρ A ​ ) x ⇒ ω = m ρ A g ​ ​ = 2 πn ⇒ n ∝ A ​ ​

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