Acork of density $0.5\ gcm^{-3}$ floats on a calm swimming pool. The fraction of the cork’s volume which is under water is ........ $\%$
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Let the fraction $f$ of volume $V$ be submerged under water. We have
weight of cork $=$ weight of water displaced
$\Rightarrow V \times 0.5 \times g=f \times V \times 1 \times g$
$\Rightarrow f=0.5$ or $50 \%$
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