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Mastering Fluids: A Comprehensive Physics Exam

Dive deep into fluid dynamics with this exam covering pressure, Pascal's principle, Archimedes' principle, and more. Test your understanding of atmospheric pressure, buoyant force, and fluid behaviors in containers. Challenge yourself with qualitative demonstrations and quantitative calculations. Are you ready to rock this physics exam?

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Mastering Fluids: A Comprehensive Physics Exam

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  1. Exam 3 Physics 101: Lecture 16 Fluids

  2. Exam 2 was: • A. Too Easy: please make the next one more difficult. • B. Just Right: I’m starting to get the hang of this stuff. • C. Difficult: but I still rocked it! Bring it on! • D. Impossible: I need help • E. We had another exam?

  3. States of Matter • Solid • Hold Volume • Hold Shape • Liquid • Hold Volume • Adapt Shape • Gas • Adapt Volume • Adapt Shape Fluids 15

  4. Qualitative Demonstration of Pressure • Force due to molecules of fluid colliding with container. • Impulse = Dp • Average Pressure = F / A y 18

  5. Atmospheric Pressure • Basically weight of atmosphere! • Air molecules are colliding with you right now! • Pressure = 1x105 N/m2 = 14.7 lbs/in2! • Example: Sphere w/ r = 0.1 m • Demo A = 4 p r2 = .125 m2 F = 12,000 Newtons (over 2,500 lbs)! 23

  6. Pascal’s Principle • A change in pressure at any point in a confined fluid is transmitted everywhere in the fluid. • Hydraulic Lift • Compare the work done by F1 with the work done by F2 A) W1 > W2 B) W1 = W2 C) W1 < W2 27

  7. Gravity and Pressure • Two identical “light” containers are filled with water. The first is completely full of water, the second container is filled only ½ way. Compare the pressure each container exerts on the table. A) P1 > P2 B) P1 = P2 C) P1 < P2 • Under water P = Patmosphere + r g h 1 2 31

  8. Dam question A B Two dams of equal height and width prevent water from entering the basin. Compare the net force due to the water on the two dams. A) FA > FB B) FA=FB C) FA< FB F = P A, and pressure is rgh. Same pressure, same Area same force even though more water in B! 35

  9. p1=0 h p2=patm Example:Barometer: a way to measure atmospheric pressure 37

  10. p1=0 h p2=patm Example:WaterBarometer: 37

  11. Question Is it possible to stand on the roof of a five story (50 foot) tall house and drink, using a straw, from a glass on the ground? 1. No 2. Yes 40

  12. Archimedes’ Principle • Determine force of fluid on immersed cube • Draw FBD • Buoyant force is weight of displaced fluid! 43

  13. Fb mg Mg Archimedes Example A cube of plastic 4.0 cm on a side with density = 0.8 g/cm3 is floating in the water. When a 9 gram coin is placed on the block, how much sinks below water surface? h 48

  14. Summary • Pressure is force exerted by molecules “bouncing” off container P = F/A • Gravity/weight effects pressure • P = P0 + rgd • Buoyant force is “weight” of displaced fluid. F = r g V

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