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.
2.
3.
Goes up
Goes down
Stays the same
Do not neglect the buoyancy of air.
CO2 is more dense than Air
Moving Fluids
Conservation of Mass
A1
A2
v1
v2
What are the assumptions?
Air flows from a pipe with large diameter into a pipe
with smaller diameter. The pressure of the air in
the small pipe is
(a) greater than,
(b) less than, or
(c) equal to
the pressure in the large pipe.
Q12-5
1 2
P  v  gh is constant
2
Where did this come from?
What is the constant?
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?
1
1
2
2
Ptop  vtop  ghtop  Phole  vhole  ghhole
2
2
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.
Water flows downhill through a pipe with constant
diameter. At the bottom of the hill, the velocity of
the 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 constant
diameter. At the bottom of the hill, the pressure of
the water is
(a) greater than,
(b) less than, or
(c) equal to
its pressure at the top of the hill.
Q12-5
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
