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EF 152 Spring, 2009 Lecture 43
1
Module 4, Lecture 3
Properties of Fluids: hydrostatics
States of Matter
Gas
Liquid
Solid
Shape
Volume
State
Fluid: substance not resistant to action of ________ forces.
Fixed or Variable?
EF 152 Spring, 2009 Lecture 43
2
Density
Density (mass density)
V
M
=
ρ
Specific Gravity:
Ratio of mass density to mass
density of _________
The specific gravity of steel is 7.85.
What is the
weight of a 22 inch diameter steel wrecking ball?
EF 152 Spring, 2009 Lecture 43
3
Pressure
A
F
p
=
SI unit:
pascal (Pa) = 1N/m
2
A football coach pumps his moped tires up to a
pressure of 80 psi.
If the combined weight of the
coach and his bike is 480 pounds , what is the
contact area of the tire with the ground?
EF 152 Spring, 2009 Lecture 43
4
Pressure in Fluid at Rest
• Pressure same in all ________
• Pressure acts ___________ to any solid surface it touches
Pressure variation with depth
0
p
gh
p
gh
p
+
=
=
Hoover Dam holds back a height of 576 ft of water.
What is the pressure at the base?
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 Spring '08
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