BIO CALCULATING LUNG VOLUME IN HUMANS. In humans, oxygen and carbon dioxide are exchanged in the blood within many small sacs called alveoli in the lungs. Alveoli provide a large surface area for gas exchange. Recent careful measurements show that the total number of alveoli in a typical pair of lungs is about 480 × 10 6 and that the average volume of a single alveolus is 4.2 × 10 6 μ m 3 . (The volume of a sphere is V = 4 3 π r 3 , and the area of a sphere is A = 4 πr 2 .) 1.92 What is total volume of the gas-exchanging region of the lungs? (a) 2000 μ m 3 ; (b) 2 m 3 ; (c) 2.0 L; (d) 120 L.
BIO CALCULATING LUNG VOLUME IN HUMANS. In humans, oxygen and carbon dioxide are exchanged in the blood within many small sacs called alveoli in the lungs. Alveoli provide a large surface area for gas exchange. Recent careful measurements show that the total number of alveoli in a typical pair of lungs is about 480 × 10 6 and that the average volume of a single alveolus is 4.2 × 10 6 μ m 3 . (The volume of a sphere is V = 4 3 π r 3 , and the area of a sphere is A = 4 πr 2 .) 1.92 What is total volume of the gas-exchanging region of the lungs? (a) 2000 μ m 3 ; (b) 2 m 3 ; (c) 2.0 L; (d) 120 L.
BIO CALCULATING LUNG VOLUME IN HUMANS. In humans, oxygen and carbon dioxide are exchanged in the blood within many small sacs called alveoli in the lungs. Alveoli provide a large surface area for gas exchange. Recent careful measurements show that the total number of alveoli in a typical pair of lungs is about 480 × 106 and that the average volume of a single alveolus is 4.2 × 106μm3. (The volume of a sphere is
V
=
4
3
π
r
3
, and the area of a sphere is A = 4πr2.)
1.92 What is total volume of the gas-exchanging region of the lungs? (a) 2000 μm3; (b) 2 m3; (c) 2.0 L; (d) 120 L.
Consider the situation in the figure below; a neutral conducting ball hangs from the ceiling by an insulating string, and a charged insulating rod is going to be placed nearby.
A. First, if the rod was not there, what statement best describes the charge distribution of the ball?
1) Since it is a conductor, all the charges are on the outside of the ball. 2) The ball is neutral, so it has no positive or negative charges anywhere. 3) The positive and negative charges are separated from each other, but we don't know what direction the ball is polarized. 4) The positive and negative charges are evenly distributed everywhere in the ball.
B. Now, when the rod is moved close to the ball, what happens to the charges on the ball?
1) There is a separation of charges in the ball; the side closer to the rod becomes positively charged, and the opposite side becomes negatively charged. 2) Negative charge is drawn from the ground (via the string), so the ball acquires a net negative charge. 3)…
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