A few things . . .

Who still doesn’t have a book? Homework and retries Labs In S415 ESC

– Can be done anytime during week (sooner=better)

– Turn into boxes outside classroom. – No make-up--equipment is taken down

Sat.

Melting ice

Discussion Question: An Alka-Seltzer tablet dissolves in water and the CO2

gas goes into a balloon. When it dissolves the scale reading

1. Goes up2. Goes down3. Stays the same

Do not neglect the buoyancy of air.CO2 is more dense than Air

A1 A2

v1 v2

Moving Fluids Conservation of Mass

What are the assumptions?

Q12-5

Air flows from a pipe with large diameter into a pipewith smaller diameter. The pressure of the air inthe small pipe is

(a) greater than,(b) less than, or(c) equal to

the pressure in the large pipe.

constant2

1 2 isghvP

What is the constant?Where did this come from?

What are the assumptions?

A blood platelet drifts along with the flow of blood through an artery that is partially blocked

by deposits. As the platelet moves from the narrow region to the wider region, it experiences

A. an increase in pressure.B. no change in pressure.C. a decrease in pressure.

The pressure at the top of a large water tank is 2 atm, the distance from the top

to a pipe is 10 m, and the area of the pipe is .1 m2. What is the velocity of the

water coming out?holeholeholetoptoptop ghvPghvP 22

2

1

2

1

Dogma?@sqcomic"Don't interfere with anything in the Constitution.That must be maintained, for it is the only safeguard of our liberties." Abraham Lincoln

@jaclong@sqcomic Forgive me but that sounds not unlike a religious dogma...

Thomas S. Monson, April 2012 General Conference

The toy boats of childhood had no keel for stability, no rudder to provide direction, and no source of power. Inevitably, their destination was downstream-the path of least resistance. Unlike toy boats, we have been provided divine attributes to guide our journey. We enter mortality not to float with the moving currents of life but with the power to think, to reason, and to achieve.

Thomas S. Monson, April 2012 General Conference

Our Heavenly Father did not launch us on our eternal voyage without providing the means whereby we could receive from Him guidance to ensure our safe return. I speak of prayer. I speak too of the whisperings from that still, small voice; and I do not overlook the holy scriptures, which contain the word of the Lord and the words of the prophets-provided to us to help us successfully cross the finish line.

Q12-5

Water flows downhill through a pipe with constantdiameter. At the bottom of the hill, the velocity ofthe water is

(a) greater than,(b) less than, or(c) equal to

its velocity at the top of the hill.

Q12-5

Water flows downhill through a pipe with constantdiameter. At the bottom of the hill, the pressure ofthe water is

(a) greater than,(b) less than, or(c) equal to

its pressure at the top of the hill.

Half the story of an airplane wing

Waves

What are they? Where do they come from?

Sine Waves

Amplitude Frequency Angular Frequency Period Wavelength Wavenumber