1.

(a) As blood passes through the capillary bed in an organ, the capillaries join to form venules (small veins). If the blood speed increases by a factor of 5.02 and the total cross-sectional area of the venules is 14.7 cm?2, what is the total cross-sectional area (in cmZ) of the capillaries feeding these venules? (b) How many capillaries are involved if their average diameter is 10.4 gym? A frequently quoted rule of thumb in aircraft design is that wings should produce about 1000 N of lift per square meter of wing. (The fact that a wing has a top and bottom surface does not double its area.) (a) At takeoff the aircraft travels at 64.0 m/s, so that the air speed relative to the bottom of the wing is 64.0 m/s. Given the sea level density of airto t (b) How fast (in m/s) must air move over the upper surface at a cruising speed of 240 m/s and at an altitude where air density is one-fourth that at sea level? (Note that this is not all of the aircraft's lift--some comes from the body of the plane, some from engine thrust, and so on. Furthermore, Bernoulli's principle gives an approximate answer because flow over the wing creates turbulence.)