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X Question 1
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Hint
use the definition of flow rate
L/min into the aorta (of radius 1.1 cm). Determine the
Blood is pumped from the heart at a rate of 7.
speed of blood (in cm/s) through the aorta.
31.26
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Chapter 12
x Question 6
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Hint
(a) What is the pressure drop (in N/m2) due to the Bernoulli effect as water goes into a 2.5 cm diameter
nozzle from a 8.6 cm diameter fire hose while carrying a flow of 32 L/s?
-2.11e6
(b) To what maximum height (in m) above the nozzle can this water rise? (The actual height will be
significantly smaller due to air resistance.
216.6
x
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Chapter 12
x Question 7
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Hint
Hoover Dam on the Colorado River is the highest dam in the United States at 221 m, with an output of
1,300 MW. The dam generates electricity with water taken from a depth of 101 m and an average flow rate
of 679 m3/s.
(a) Calculate the power in this flow in watts.
6.7276e8
(b)What is the ratio of this power to the facility’s average of 680 MW?
0.9894
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Chapter 12
Question 9
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(a) Find the average time (in s) required for an oxygen molecule to diffuse through a 0.192 mm thick tear
layer on the cornea. (Assume the diffusion constant of oxygen through tears is 2e-9 m2/s.)
9.216
(b) How much time (in h) is required to diffuse 0.45 cm of oxygen to the cornea if its surface area is 1.01
cm??
4,962.75
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