Consider the following. (a) About how many microorganisms are found in the human

Question

Consider the following.
(a) About how many microorganisms are found in the human intestinal tract? (A human intestinal tract has a length of about 7 m and average diameter of 4 cm. A typical bacterial length scale is 10-6 m. Estimate the intestinal volume and assume one hundredth of it is occupied by bacteria.)





A train is traveling down a straight track at 35 m/s when the engineer applies the brakes, resulting in an acceleration of -1.0 m/s2 as long as the train is in motion. How far does the train move during a 22 s time interval starting at the instant the brakes are applied?




A bullet is fired through a board 11.0 cm thick in such a way that the bullet's line of motion is perpendicular to the face of the board. The initial speed of the bullet is 400 m/s and it emerges from the other side of the board with a speed of 300 m/s.
(a) Find the acceleration of the bullet as it passes through the board.

m/s2

(b) Find the total time the bullet is in contact with the board.
s

Explanation / Answer

pfind volume of intestinal tract
V= pr2l p(0.04/2)2(7 m) = 0.0088 m3 0.0088 m3 *(1/100) = 0.000088 0.0088 m3 *(1/100) = 0.000088 0.000088/10^-6 = volume occupied by bateria

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