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Questions  >>  JEEMAIN and NEET  >>  Physics  >>  Class11  >>  Units and Measurement
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Q)

A block of wood floats in water with $\large\frac{4}{5}$ th of its volume submerged , but it just floats in a liquid . What is the density of the liquid ?

$\begin{array}{1 1} 750\;kg m^{-3} \\ 800 \;kg\;m^{-3} \\ 1000\;kg m^{-3} \\ 1250\;kg m^{-3} \end{array} $

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A)
$\rho _1= \rho \times \large\frac{v}{4/5v}$
$\qquad= \frac{5}{4}$$e$
$\rho _2= \rho \times \large\frac{v}{v}$
$\qquad=\rho$
$\rho _1=\large\frac{5}{4}$$ \rho _2$
$\rho _2=\large\frac{4}{5}$$ \times 1000 $
$\qquad= 800 \;kg\;m^{-3}$
Answer: $ 800 \;kg\;m^{-3}$
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