1.An engineer is given the job of designing the water system for a tall building

Question

1.An engineer is given the job of designing the water system for a tall building. He decides to locate the pumps at ground level and feed the entire building from there. If the top floor of the building is 250 m above ground level, what must the pressure be at pump level?

(a) Find h. (Assume h is positive.)

3.A rectangular block of wood (density 675 kg/m3) of height 32 cm floats in a lake. What is the height of the wood above the water level?

4.Two metal blocks are attached by a cable as shown in the figure below and are submerged at rest near the surface of a lake. If the volumes are V1 = 3.6 m3 and V2 = 2.0 m3, what is the total buoyant force on the two blocks?

5.The blood flow rate through the aorta is typically 102 cm3/s, and a typical adult has about 4.9 liters of blood.

(a) How long does it take for all your blood to pass through the aorta?

(b) If your aorta has a diameter of 1.9 cm, what is the speed of blood as it flows through the aorta?

Explanation / Answer

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Consider that the pump has to lift a column of water a height of 250 m. If A is the area of that column, the weight of that column is 250*A*g*row, where row is the density of water = 1000 kg/m

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