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Pressure

Pressure. A rectangular room has floor dimensions of 3.5 m by 4.2 m and a height of 2.4 m. If ρ air = 1.21 kg/m 3 , what does the air in the room weigh? What force does the 1 atm of air exert on the floor?. Pressure.

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Pressure

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  1. Pressure A rectangular room has floor dimensions of 3.5 m by 4.2 m and a height of 2.4 m. If ρair = 1.21 kg/m3, what does the air in the room weigh? What force does the 1 atm of air exert on the floor?

  2. Pressure What is the total pressure on the back of a scuba diver in a lake at a depth of 8 m? What is the force on the divers back due to the water above him, assuming their back is a rectangle 60 cm by 50 cm?

  3. An object has a weight of 8 N when it is in air. However, it apparently weighs only 4 N when it is completely submerged in water. What is the density of the object? Buoyant Force

  4. A flat bottomed rectangular boat is 4 m long & 1.5 m wide. If the mass of the boat and its contents is 2000 kg, how much of the boat will be submerged when it floats in a freshwater lake? Buoyant Force

  5. An ideal fluid is moving at 3 m/s in a section of a pipe of radius 0.2 m. If the radius of another section of the pipe is 0.35 m, what is the speed there? Continuity Eqn.

  6. Water falling out of a faucet with cross sectional area of 1.2 cm2 narrows during its fall to an area of 0.35 cm2. The two levels are separated by a distance of h= 45 mm. At what rate does the water flow? Flow Rate

  7. High cholesterol causes plaques to form on the walls of blood vessels. Suppose plaque reduces the effective radius of an artery by 25%. How does this affect the speed of the blood? Continuity Eqn.

  8. 40 cm 30 cm 20 cm 10 cm Bernoulli The water level is maintained at 45 cm by an outside supply. What is the speed of the water out of each hole?

  9. The flow rate of water through a garden hose is 66 cm3/s and the hose/spigot and nozzle have cross sectional areas of 6 cm2 and 1 cm2 respectively. The nozzle is held 10 cm above the spigot. What are the flow speeds through the spigot and the nozzle? What it the pressure difference between these two points? Bernoulli

  10. A liquid of density ρ = 1650 kg/m3 flows through 2 horizontal sections of tubing. In the first section the A = 10 cm2 , flow speed is 275 cm/s and p = 1.2 x 105 Pa. In the second section, A = 2.5 cm2. What is the flow speed and pressure in the smaller section? Bernoulli, Flow Rate

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