Class Notes (972,822)
CA (572,915)
Mount A (124)
PHYS (10)
PHYS 1041 (10)
Lecture 5

# PHYS1041 Notes Week 5

by OneClass222616 , Winter 2014
2 Pages
92 Views

Department
Physics
Course Code
PHYS 1041
Professor
Dr.David Fleming
Lecture
5

This preview shows half of the first page. Sign up to view the full 2 pages of the document.
Physics 1041
March 3rd
Pressure
fluid: matter that flows under influence of external force
comprised of both liquids and gases
fluids are incompressible; density is constant
gases are compressible; density is variable
density:
)(
)(
3
mvolume
kgmass
=
ρ
density of water:
3
/.1000
2
mkg
OH
=
ρ
density of mercury:
3
/.13600 mkg
Hg
=
ρ
pressure: measure normal force per unit area exerted by a fluid
pressure:
)(
)(
2
marea
Nforce
P
=
the unit of N/m2 is a Pascal (Pa)
Example: Pressure changes with depth in a fluid
pressure at water surface is the same as air pressure
pressure increases as depth increases
for a fluid to remain at rest, net force everywhere must be equal to zero
more and more fluid is above you pushing you down the deeper you are; pressure
must increase to counteract that effect
this is called hydrostatic equilibrium
hydrostatic equilibrium:
ghPP
O
ρ
+=
P=pressure
PO=pressure of liquid at surface
ρ=density of liquid
g=acceleration due to gravity
h=height (depth) of fluid
barometer: instrument used to measure pressure
air pressure acts on an open pool/liquid
there is no pressure inside a barometer; when pressure comes from outside, it
causes the liquid inside the barometer to rise
the difference in pressure between 2 ends of a tube results in a height difference
between 2 liquid surfaces
gauge pressure: the difference between pressure of your point of interest and an
atmospheric pressure
atmospheric pressure: on average, 101.3kPa
Pascal's Law: an increase in surface pressure results in a pressure increase
throughout the fluid

#### Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
Physics 1041 March 3rd Pressure • fluid: matter that flows under influence of external force • comprised of both liquids and gases • fluids are incompressible; density is constant • gases are compressible; density is variable ρ = mass(kg) • density: volume (m ) 3 • density of water: ρ H2O =1000.kg /m ρ = 13600 .kg / m • density of mercury: Hg • pressure: measure normal force per unit area exerted by a fluid force (N) • pressure: P = 2 area(m ) • the unit of N/m is a Pascal (Pa) Example: Pressure changes with depth in a fluid • pressure at water surface is the same as air pressure • pressure increases as depth increases • for a fluid to remain at rest, net force everywhere must be equal to zero • more and more fluid is above you pushing you down the deeper you are; pressure must increase to counteract that effect • this is called hydrostatic equilibrium • hydrostatic equilibrium: P = PO+ ρgh • P=pressure • P Opressure of liquid at surface • ρ=density of liquid • g=acceleration due to gravity • h=height (depth) of fluid • barometer: instrument used to measure pressure • air pressure acts on an open pool/liquid • there is no pressure inside a barometer; when pressure comes from outside, it causes the liquid inside the barometer to rise • the difference in pressure between 2 ends of a tube results in a height difference between 2 liquid surfaces • gauge pressure: the difference between pressure of your point of interest and an atmospheric pressure • atmospheric pressure: on average, 101.3kPa • Pascal's Law: an increase in surface pressure results in a pressure increase throughout the fluid March 5th Pressure • specific gravity: ratio of density of a substance to the density of water ρ Hg 13600 kg / m 3 • example: specific gravity of mercury: = 3 = 13.6
More Less

Only half of the first page are available for preview. Some parts have been intentionally blurred.

Unlock Document

Unlock to view full version

Unlock Document
Notes
Practice
Earn
Me

OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Join to view

OR

By registering, I agree to the Terms and Privacy Policies
Just a few more details

So we can recommend you notes for your school.