PAGE EDITORS: Carlos Barrera, Mack Shoer, Alfredo Cubina

Natland Note: (2/27/14)
  • need some more images and videos posted (look at the guidelines on the homepage). Also, each image needs a caption. If there are any without one, add in a 1-2 sentence description
  • remember to post good/useful links to websites on this topic, as well as 1-2 videos.
  • also, you want to reorganize this a bit...the problems should go AFTER all of the other pictures
    • The problems also need solutions, posted below each one
  • There needs to be a video posted that is created by one of you.





Problems 29 demonstrates Pascal's Principle and 30 demonstrates Archimedes' Principle

Answer 29: 8.503 kg
Answer 30: a)Force Down=37567.15 N
b)Force up=39747.45 N
c)T=2229.694 N
d)Buoyancy=2180.3 Archimedes principle states that the volume of an object is the same as the volume of fluid displaced and by using the formula B= (rho fluid)(Volume fluid displaced)g finds the buoyant force
Answer: 1799.66 kg/m^3

Answer: .0065 m sinks down

Answer: a).346 m away from tank
b).3 m down in the tank
c)half way down=.2 m

external image cub_energy2_lesson08_activity1_fig1.jpg
(Fluids group: Explain image above here)

external image water_tower_snyder_texas_1.jpgexternal image Roihuvuori_watertower3.png
(Fluids group: Explain images above here)

Pascal's Principle

This demontrates Pacscal's Principle with an enclosed fluid. This principle applies when the liquid is incompressible, meaning that the density does not vary, and the volume stays the same.


File:Pressure distribution on an immersed cube.png
File:Pressure distribution on an immersed cube.png

Caption: In the above image, the arrow lengths represent the greater force that molecules in the fluid apply to an object at different depths. From the image, you can see there is a resulting net force from the fluid due to the difference in pressure between the top and bottom of the object. The resulting force we call the buoyant force.

Learn about buoyancy by playing with this PHET (Created by University of Colorado: Boulder)
If it doesn't work, follow this link:

File:Iceberg - NOAA.jpg
File:Iceberg - NOAA.jpg
external image Iceberg.jpg
Caption: Images of icebergs. With a specific gravity around 0.9, around 9/10 (90%) of an iceberg's volume will reside below the surface.

external image basics1_wood_1_.gif
Caption: When you place a block of wood in a pail of water, the level goes up. If you could weigh the water that the wood displaces, you would find that its weight equals the weight of the wood.

external image 7882f1.resized.jpg
Caption: Person floating high in the water of the Dead Sea, which has a much higher than usual salt concentration, and thus a higher density standard seawater.

Note about the Dead Sea:
"Not only is it the lowest point on earth (over 1,380 ft below sea level), but it’s also one of the saltiest, with the salinity of the water at about 31% — that’s about 8 times saltier than ocean water. And because of this high concentration of natural salt, the density of Dead Sea water is almost 24% higher than regular water, which means that many things that don’t normally float actually become buoyant

Can a 14-lb bowling ball float in the dead sea?

external image 220px-Pound-coin-floating-in-mercury.jpg

Caption: A metallic coin (one British pound coin) floats in mercury due to the buoyancy force upon it and appears to float higher because of the surface tension of the mercury.

File:Density column.JPG
File:Density column.JPG

Caption: A density column containing some common liquids and solids. From top: baby oil, rubbing alcohol (with red food coloring), vegetable oil, wax, water (with blue food coloring), and aluminum.

external image submarine.gif

Compare how a submarine works to what happened to the Titanic...

external image titanic-15.gifexternal image titanic.jpg
Caption: the ship sank because the iceberg caused its hull to buckle -- likely because it was held together with second-rate rivets -- creating six narrow openings in the side. Water gushed in, unevenly filling five forward compartments at a rate of 7 tons per second [sources: The New York Times; Encyclopaedia Britannica]. Ultimately, the uneven strain rent the behemoth in half, and down it went.

external image wally-ocean-conveyor-no-credit.jpg
external image edb1e112-b073-4bf2-9d83-95eb6b0cdde0.jpg

external image o.jpg

Use of Chlorine Gas in WWI
external image 400px-Poison_gas_attack.jpg
chlorine gas was used for the first time at the Second Battle of Ypres in April 1915. On the 22nd April, French sentries in Ypres noticed a yellow-green cloud moving towards them - a gas delivered from pressurized cylinders dug into the German front line. They thought that it was a smokescreen to disguise the movement forwards of German troops. As such, all troops in the area were ordered to the firing line of their trench - right in the path of the chlorine. Its impact was immediate and devastating. The French and their Algerian comrades fled in terror.

The killing capacity of gas, however, was limited – only four percent of combat deaths were caused by gas. Gas was unlike most other weapons of the period because it was possible to develop effective countermeasures, such as gas masks. In the later stages of the war, as the use of gas increased, its overall effectiveness diminished.

Some of the chemical/physical properties of chlorine include:
  • Chlorine is a yellow-green gas at room temperature.
  • Chlorine has a pungent, irritating odor similar to bleach that is detectable at low concentrations.
  • The density of chlorine gas is approximately 2.5 times greater than air, which will cause it to initially remain near the ground in areas with little air movement.

The health effects resulting from most chlorine exposures begin within seconds to minutes. The severity of the signs and symptoms caused by chlorine will vary according to amount, route and duration of exposure.
  • Inhalation: Most chlorine exposures occur via inhalation. Low level exposures to chlorine in air will cause eye/skin/airway irritation, sore throat and cough. Chlorine's odor provides adequate early warning of its presence, but also causes olfactory fatigue or adaptation, reducing awareness of one's prolonged exposure at low concentrations. At higher levels of exposure, signs and symptoms may progress to chest tightness, wheezing, dyspnea, and bronchospasm. Severe exposures may result in noncardiogenic pulmonary edema, which may be delayed for several hours.
  • Ingestion: Since chlorine is a gas at room temperature, it is unlikely that a severe exposure will result from ingestion. However, ingestion of chlorine dissolved in water (e.g., sodium hypochlorite or household bleach) will cause corrosive tissue damage of the gastrointestinal tract.
  • Eye/Dermal Contact: Low level exposures to chlorine gas will cause eye and skin irritation. Higher exposures may result in severe chemical burns or ulcerations. Exposure to compressed liquid chlorine may cause frostbite of the skin and eyes.

external image warningcartoon2.jpgexternal image tsunami-geology-4.jpg

external image tsunami-japan-2011.jpg

external image japan_tsunami_1.jpg (5:44)
"Most Shocking Video of the Tsunami in Japan" (14.49)
"Japan Tsunami 2011 - Ocean Overtops Wall"


Fluids Notes: Power point
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File Not Found

Fluids conceptual question (those we did in class, and more!):

WEBSITES: (2:03)
"Bed of Nails: Cool Science Experiment"
external image Physics%20PIC7-large.jpg (2:21)
"Bed of Nails"...ouch....ouch? (1:55)
(Air Gun: Part I: Supersonic Ping Pong Ball) (1:40)
(Air gun: Part II: Supersonic Ping Pong Ball)
(Nascar's Greatest Last Lap Passes)

Image result for peloton formation
Image result for peloton formation
Image result for peloton formation
Image result for peloton formation

(water in straw image)
(water tower image/cartoon)
(picture of water tower)
(three buoyancy images)
(Info and video about the dead sea)
(2 pictures, including submarine picture)
(Titanic info & picture)
(iceberg picture)
(Pascal's Principle pic)
(great ocean conveyor picture)