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Physics Chp 9

Physics Chp 9. Fluids – move (flow), change shape Liquids vs Gases Density p = m/V Density of water is 1000 kg/m 3. Why do you feel lighter in a pool?. Buoyant Force F B = m f g F B = p f V f g F B = m o g. So our weight in water F net = F g – F B F net = mg - pVg.

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Physics Chp 9

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  1. Physics Chp 9

  2. Fluids – move (flow), change shape • Liquids vs Gases • Density p = m/V • Density of water is 1000 kg/m3

  3. Why do you feel lighter in a pool?

  4. Buoyant Force • FB = mfg • FB = pfVfg • FB = mog

  5. So our weight in water • Fnet = Fg – FB • Fnet = mg - pVg

  6. If submerged in a fluid • Fg/FB = po/pf

  7. Pressure • P = F/A • In a closed system P is constant • P1 = P2 F1/A1 = F2/A2

  8. Jacks use this equation • The force you put in on an area comes out the other end and if the area is large the force also has to be large to have a constant pressure.

  9. As you dive down in a pool the pressure increases, why?

  10. P = Po + pgh • How does this also explain the problem with climbing Mt. Everest?

  11. P = 101325 Pa + (1.29 Kg/m3 )(9.8 m/s2)(-8850m) • P = • How does this affect cooking?

  12. Temperature • Celsius vs Kelvin • K = oC + 273

  13. As fluid enters a tube that is open on both ends the mass of the fluid going in has to be equal to the mass coming out. • A1v1 = A2v2 continuity equation • How does this explain the effect on kinking a hose?

  14. Bernoulli’s Equation • P1 + 1/2pv12 + pgh1 = P2 + 1/2pv22 + pgh2 • When the fluid isn’t moving this gives the pressure equation P = Po + pgh • This equation is used often to explain the affects of moving air like wind over a roof.

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