A cubical block of side 10 cm floats at the interface of an oil and water. The pressure excluding pressure of atmosphere at the lower face of the block is:

$200 N / m^{2}$

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$680 N / m^{2}$

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$400 N / m^{2}$

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$800 N / m^{2}$

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Solution

The correct option is D
$800 N / m^{2}$

$P = P_{0} + ρ_{1} g h 1 + ρ_{2} g h_{2} P - P_{0} = 600 \times 10 \times 0.1 + 1000 \times 10 \times 0.02$
= 600 + 200
$P - P 0 = 800 N / m^{2}$

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A cubical block of side 10 cm floats at the interface of an oil and water. The pressure excluding pressure of atmosphere at the lower face of the block is:

The correct option is D 800N/m2 P=P0+ρ1gh1+ρ2gh2P−P0=600×10×0.1+1000×10×0.02 = 600 + 200 P−P0=800N/m2

The correct option is D
$800 N / m^{2}$

$P = P_{0} + ρ_{1} g h 1 + ρ_{2} g h_{2} P - P_{0} = 600 \times 10 \times 0.1 + 1000 \times 10 \times 0.02$
= 600 + 200
$P - P 0 = 800 N / m^{2}$