Absolute pressure at the bottom of a container

  • Thread starter kimlu
  • Start date
  • #1
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Homework Statement



A container is filled to a depth of 20.0 cm with water. On top of the water floats a 29.0-cm-thick layer of oil with specific gravity 0.800. What is the absolute pressure at the bottom of the container?
(Answer in Pa)

Homework Equations



P= ρgh+ P(atmospheric)

The Attempt at a Solution



(800)(9.81)(29-20)+101.3x10^3= 171932

Webassign says "Your response differs from the correct answer by more than 10%. Double check your calculations."

Did I substitute something wrong?
 

Answers and Replies

  • #2
1,540
135
Hi kimlu...

You have to calculate pressure at the bottom of the container ,not between the interface of water and oil .

You also seem to have forgotton to convert 'cm' to 'm' .
 
Last edited:
  • #3
ehild
Homework Helper
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Homework Statement



A container is filled to a depth of 20.0 cm with water. On top of the water floats a 29.0-cm-thick layer of oil with specific gravity 0.800. What is the absolute pressure at the bottom of the container?
(Answer in Pa)

Homework Equations



P= ρgh+ P(atmospheric)

The Attempt at a Solution



(800)(9.81)(29-20)+101.3x10^3= 171932

Webassign says "Your response differs from the correct answer by more than 10%. Double check your calculations."

Did I substitute something wrong?

Yes.

Why did you subtract the thickness of water from the thickness of oil?

ehild
 

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