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# Physics ch 13

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Ch 13 Notes

Ch 13 Notes

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### Transcript

• 1. States of Matter - Fluids Ch 13
• 2. Pressure
• Force per unit area
• P = F / A
• units are N/m 2 = 1 Pascal (Pa)
• Atmospheric Pressure – pressure exerted by the air above us
• At sea level the atmosperic pressure =
• 101300 Pa = 1 atm = 14.7 lb/in 2 = 760 mmHg
• 3. Pascal’s Principle
• Pressure applied to a confined fluid increases the pressure throughout by the same amount
• F 1 /A 1 = F 2 /A 2
• Example: Hydraulic Jack
• 4. Density
• Ratio of mass to volume of a substance
• ρ =m/v
• Units are kg/m 3
• Density of water is 1 g/cm3 (1000 kg/m 3 )
• 5. Fluid Pressure
• The pressure exerted by a fluid is the weight density of the fluid times the depth
• P = ρ g h
• 6. Bernoulli’s Principle
• As the velocity of a fluid increases the pressure exerted by the fluid decreases
• Example: Airplane wing
• 7. Archimedes’ Principle
• The buoyant force on a body immersed in a fluid is equal to the weight of the fluid displaced by that object.
• 2 Cases
• If the object floats (it is less dense than the fluid) then the buoyant force equals the weight of the object; F B = m o g
• If the object sinks then the buoyant force equals the weight of the fluid displaced; F B = ρ F g V
• 8. Building Upon Archimedes’ Principle
• If the weight is greater than the buoyant force the object will sink.
• The apparent weight in the fluid can be found as follows:
• W app = W o – F buoyant
• If the object is floating the percentage submerged below the fluid surface can be found as follows:
• % Submerged = (  ) object X 100 (  ) fluid