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Question: Answered & Verified by Expert
A rectangular block of mass $m$ and area of cross-section A floats in a liquid of density $\rho$. If it is given a small vertical displacement from equilibrium it undergoes with a time period $T$, Then:
PhysicsMechanical Properties of FluidsNEETNEET 2006
Options:
  • A $T \propto \frac{1}{\sqrt{m}}$
  • B $T \propto \sqrt{\mathrm{A}}$
  • C $T \propto \frac{1}{\sqrt{A}}$
  • D $T \propto \frac{1}{\rho}$
Solution:
1829 Upvotes Verified Answer
The correct answer is: $T \propto \frac{1}{\sqrt{A}}$
Restoring force $=A \times \int g=k x$
$\begin{array}{ll}
\Rightarrow & K=A \rho g \\
\Rightarrow & T=2 \pi \sqrt{\frac{m}{A \rho g}}
\end{array}$
This shows that $T \propto \frac{1}{\sqrt{A}}$.

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