First slide

Pressure in a fluid-mechanical properties of fluids

Question

A homogeneous solid cylinder of length L(L > H/2). Cross-sectional area A/5 is immersed such that it floats with its axis vertical at the liquid-liquid interface with length L/4 in the denser liquid as shown in the figure. The lower density liquid is open to atmosphere having pressure P₀. Then density D of solid is given by

Moderate

A

$\frac{5}{4} d$
B

$\frac{4}{5} d$
C

$d$
D

$\frac{d}{5}$

Solution

$Weight of cylinder = Upthrust due to both liquids$
$V \times D \times g = (\frac{A}{5} \times \frac{3}{4} L) \times d \times g + (\frac{A}{5} \times \frac{L}{4}) \times 2 d \times g$
$\Rightarrow (\frac{A}{5} \times L) \times D \times g = \frac{A \times L \times d \times g}{4} \Rightarrow \frac{D}{5} = \frac{d}{4}$
$∴ D = \frac{5}{4} d$

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