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Q. 9

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 383

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Short Answer

A 50-cm-thick layer of oil floats on a 120-cm-thick layer of water. What is the pressure at the bottom of the water layer?

Total pressure at the bottom of the water is 117 Kpa

See the step by step solution

Step by Step Solution

Step1 : Given information

A 50-cm-thick layer of oil floats on a 120-cm-thick layer of water.

Step2: Explanation

Total pressure exerted is sum of pressure exerted by oil , water and atmospheric pressure

That means

PTotal = Po + Poil + PWater

Po = 101 kPa

Poil = hoil ρoil g

PWater = hWater ρWater g

ρWater = 1000 kg/m3

ρoil = 870 kg/ m3

Now substitute the value and get PTotal

PTotal = 101 kPa + ( 0.5 m x 870 kg/m3 x 9.8 m/s2) + ( 1.2 m x 1000 kg/m3 x 9.8 m/s2)

PTotal = 117 kPa

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