Review the Video links at the bottom of this page on Hydrostatic Pressure & Buoyancy. They include questions as you go along (don't worry about specific gravity section in the video, but do think about the sections before specific gravity AND after specific gravity).

Monday, 12-14-09:

In Class:

attempt rvw of pressure, gauge pressure, buoyancy

Homework:

Read 9.7, Fluids in Motion

Take notes on Continuity of Flow & Bernoulli's Principle.

What assumptions do we make for our fluids?

How is Bernoulli's Principle similar to conservation of mechanical energy?

PS 9.1:

Conceptual Questions: 1, 5, 14, 15, 17

Problems: 13, 19, 41 b (not a), 43 - 45

A basement is made to be water-tight. It has walls 3m tall, 10m wide, and 15m across. The area floods, what buoyant force does the basement exert on the house?

A moron builds a mylar helium weather balloon. He claims his 40 pound kid (178 N) is in it as it floats away. How big would the balloon have to be for this to be true? If the mylar balloon is 4m^3 in volume, is the moron lying?

When Superman was in high school he was showing off for the ladies. He used a piece of steel tubing as a straw to drink a soda from the top of a 5 story building. Superman began to attempt to drink from his 25 meter height. Lex got annoyed by Superman's confidence and said, "Apparently Superman didn't take physics. You're not /super/ enough to drink from that straw." Show if Lex is right or wrong. The fate of the world lies in the balance.

Tuesday, 12-15-09:

In Class:

Work on the problems listed above. We'll review some on Wednesday & see if we can find some examples.

Friday, 12-18-09:
In Class:
Work on Bernoulli Squirt lab.
Homework:
Finish calculations for Bernoulli Squirt lab. Monday morning we'll test it quickly, then move on.
Read the following sections carefully and selectively. Try it in the order I ask, see if that helps.
Pg 339, 10.5 Read to understand the 5 assumptions
pg 340 and 341: Molecular Model for Pressure of an Ideal Gas: read to be able to follow it, not replicate it. Understand
pg 341: Molecular Interpretation of Temperature:
more clarified this eveing.

we assume that a liquid* is not compressible. Imagine a tube with water flowing left-to-right. Now the tube gets smaller in diameter. Two meters down the pipe diameter gets wider. If the fluids does not compress or expand, then the rate that a volume of fluid flows must remain constant.

The rate volumetric flow rate is = (cross sectional area of the pipe) x (velocity of fluid) or

The rate volumetric flow rate is = (area of the circle part of the pipe) x (velocity of fluid) or

VFR = A x v

VFR = (pi r^2) x v

The ap folks do not use VFR for volumetric flow rate.

We just mentioned three sections of pipe (section 1 with original diameter (cross-section), a smaller diameter 2 (cross-section), and a wider diameter 3).

we get:

A1v1=A2v2=A3v3 not that all #'s to the left should be subscript notes helping us understand which section of pipe we are talking about. the #'s do NOT mean mulitply by 1, 2, or 3

Bernoulli's Principle:

Bernoulli's Prinicple is really conservation of energy for fluids.

(GPE fluid + KE fluid + Work done to fluid) on one side of the pipe = (GPE fluid + KE fluid + W done to fluid) at the other side of the pipe.

Two notes:

instead of using m, we use density of fluid. Much easier to talk about the density of a fluid than the mass of a fluid that passes through a point during some time interval.

Bernoulli's Principle is exactly the same thing as conservation of energy for fluids. The interesting thing; Bernoulli's Prinicple was figured out before conservation of energy was understood.

Fluids Notes: Mr Wayne Mullins created some **really nice notes** on fluids & oscillators. We will cover oscillators later. If you go to page 8, there are some nice notes on fluids.

Some Video Stuff on:

Hydrostatic Pressure: the start link is on the left side (don't worry about specific gravity section)

Friday, 12-11-09:Monday, 12-14-09:Tuesday, 12-15-09:- In Class:
- Work on the problems listed above. We'll review some on Wednesday & see if we can find some examples.

Friday, 12-18-09:In Class:

Work on Bernoulli Squirt lab.

Homework:

Finish calculations for Bernoulli Squirt lab. Monday morning we'll test it quickly, then move on.

Read the following sections carefully and selectively. Try it in the order I ask, see if that helps.

Pg 339, 10.5 Read to understand the 5 assumptions

pg 340 and 341: Molecular Model for Pressure of an Ideal Gas: read to be able to follow it, not replicate it. Understand

pg 341: Molecular Interpretation of Temperature:

more clarified this eveing.

Dark Matter Detected for First Time?http://news.nationalgeographic.com/news/2009/12/091218-dark-matter-detected-mine-minnesota.html

This is funny. Look at Dec 22nd's comic. have a nice break. http://comics.com/pearls_before_swine/?Page=1

:Continuity of flowmustremain constant.Bernoulli's Principle:: Mr Wayne Mullins created some **really nice notes** on fluids & oscillators. We will cover oscillators later. If you go to page 8, there are some nice notes on fluids.Fluids NotesSome Video Stuff on: