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Mon Oct 29 Attendance Homework Pressure Buoyancy Homework pg 408 problems (Google Docs)

Mon Oct 29 Attendance Homework Pressure Buoyancy Homework pg 408 problems (Google Docs). What have we studied so far?. GP 1 Vectors SOHCAHTOA 1D Kinematics Projectiles (2D Kinematics). Relative Motion Forces FBD Friction. GP 2 Work Energy Types Energy Conservation Power

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Mon Oct 29 Attendance Homework Pressure Buoyancy Homework pg 408 problems (Google Docs)

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  1. Mon Oct 29 Attendance Homework Pressure Buoyancy Homework pg 408 problems (Google Docs)

  2. What have we studied so far?

  3. GP 1 Vectors SOHCAHTOA 1D Kinematics Projectiles (2D Kinematics)

  4. Relative Motion Forces FBD Friction

  5. GP 2 Work Energy Types Energy Conservation Power Stopping Distance Momentum Collisions

  6. Impulse Circular Motion Torque SHM Springs Pendulum Gravitation

  7. GP 3 Pressure Buoyancy Flow Rate Continuity Bernoulli’s Equation Thermal Expansion

  8. Pressure Defined as a force per unit area Atmosphere bar P = F/A (Pascal = Pa = N/m2)

  9. Pressure of fluids dependent on type/density of fluid

  10. Pressure underwater is in all directions Drawing of box and direction of different forces from pressure

  11. P = pgh P = pgDh Calculating pressure underwater P = F/A …

  12. Ex - The surface of the water level in a storage tank is 30 m above a water faucet in a kitchen of a house. 
Calculate the water pressure at the faucet. (pw = 1000 kg/m3)

  13. Atmospheric Pressure What is air pressure? What causes air pressure?

  14. Demos on water jug and plungers

  15. Atmospheric pressure (PA) = 101.3 kPa

  16. Pg = gauge pressure (think about tires) Absolute pressure P = Po + Pg

  17. What is the max height of water that air pressure can hold up? (pw = 1000 kg/m3)

  18. What is the total pressure on a diver that is 10 m under water if he has a total surface area of 1.5 m2?

  19. Pascal’s Principle

  20. Pressure throughout a confined fluid is the same Pin = Pout Fin = Fout Ain  Aout

  21. Buoyancy Do you feel heavier or lighter when you are in water? When you are in the pool, is it easier or harder to lift someone up?

  22. Demo - Spring scale holding up a wooden block, show force when block is lowered into water.

  23. Buoyancy Simulation What happens to the different objects as we add them to the water? Pay attention to the forces on the different objects and how the forces change when in and out of water.

  24. Buoyant Forces Draw what forces look like. Fb = F2 - F1 Fb = pgV (volume under the water)

  25. Ex - A 70 kg statue lies at the bottom of the sea. It has a volume of 3 x 104 cm3. How much force is needed to lift it through the water? How much is needed to lift it out of the water?

  26. Ex - Archimedes' Gold When a crown of mass 14.7 kg is submerged in water, the scale only reads 13.4 kg. Is the crown made of gold?

  27. Ex - A hydrometer is used to calculate specific gravity by seeing how far it sinks. A hydrometer is a glass tube with a weight at the bottom. The tube is 25 cm long, 2 cm2 in area, and has a mass of 45 g. Where should the 1.000 mark be when it is placed in water?

  28. Ex - Floating continents. A simple model considers a continent as a block of density 2800 kg/m3 floating on a mantle rock of density 3300 kg/m3. Assuming the continent is 35 km thick, what percentage is floating?

  29. Ex - Helium Balloons. What volume of helium is needed if a balloon is to lift a load of 800 kg? (pa = 1.29, ph = 0.179)

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