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Chapter 14: Q. 9 (page 383)

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?

Short Answer

Expert verified

Total pressure at the bottom of the water is 117 Kpa

Step by step solution

01

Given information

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

02

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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