(a) Calculate how high you can suck up water in a straw. Assume that the pressur
ID: 1417518 • Letter: #
Question
(a) Calculate how high you can suck up water in a straw. Assume that the pressure of the lower end in the water is at atmospheric pressure. The pressure in the lungs can be reduced to a value 10.0 kPa less than normal atmospheric pressure. The density of water is 1.00×103 kg/m3. You can assume that the water is stationary in the straw, and that the straw is vertical, when you make your calculation.
(b) Calculate the mass of water in the straw, if the straw has a circular cross section and has an internal diameter of 4.00 mm. If you did not obtain an answer for part (a), use 0.900 m for the height of water in the straw.
Explanation / Answer
(a) Pressure = pgH
10*103 = 103*9.81*H
H = 1.02 m
(b) mass = Density*Volume
Mass = 103*(Pi*r2H) = 103*(Pi*22*10-6*1.02) = 12.818 gm
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