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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

Score: 7.5/11 11/11 answered

x Question 6

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(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

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Chapter 12

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x Question 7

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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

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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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