# Physics: Pressure vs depth in liquid; total force on rectangular and triangular surfaces.

Not what you're looking for?

See attachment #1 for a diagram showing parameters.

A solid prism has a vertical rectangular face of height H= .90 m by width W=.5 m and a horizontal rectangular face of length L= 1.2 m, with W=.5 m also. The prism is submerged in liquid whose density is D= 1600 kg/m^3 with the horizontal face at depth B= .35 m.

PART a.

Find the total force exerted by the liquid on the horizontal rectangular surface of length L by width W at depth B.

PART b.

Find the total force exerted by the liquid on the vertical rectangular surface, height H, width W, top edge at depth B.

PART c.

Find the total force exerted by the liquid on the vertical triangular face with edge H vertical and edge L horizontal.

##### Purchase this Solution

##### Solution Summary

The solution provides an excellent explanation of how to solve the problem and calculates the answers.

##### Solution Preview

See attachment #2

The general relationship required to find pressure at some depth h in a liquid of density D, is (1) P= D g h. For finding force F, exerted by the liquid on a surface area A we need (2) F = P A or the element dF = P dA.

PART a.

Note that since the horizontal surface is at constant depth B, the pressure is also constant over this surface, so for the total force on area LW we can write:

(3) F = D g B L W. Substituting all knowns should give you F= 3293 nt. To give an example of how the units involved work out, the substitution of knowns, is shown with units for proper physics, on attachment #2.

PART b.

For ...

##### Purchase this Solution

##### Free BrainMass Quizzes

##### Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.

##### Basic Physics

This quiz will test your knowledge about basic Physics.

##### Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

##### Classical Mechanics

This quiz is designed to test and improve your knowledge on Classical Mechanics.

##### Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.