I am having trouble understanding the solution to a problem using Bernoulli\'s E
ID: 1267501 • Letter: I
Question
I am having trouble understanding the solution to a problem using Bernoulli's Eqn. (15.61, Physics 4E by Walker.) The question is:
Tests of lung capacity show that adults are able to exhale 1.5 liters of air through their mouths in as little as 1.0 second.
A) If a person blows air at this rate through a drinking straw with a diameter of 0.60cm , what is the speed of air in the straw?
B) If the air from the straw in part A is directed horizontally across the upper end of a second straw that is vertical, as shown in the figure, to what height does water rise in the vertical straw?
I got the answer to A (53 m/s), using v=Q (flow rate)/A. But, I don't understand how to solve Part B. The Guided Solution from Chegg says to use Bernoulli's Eqn, but I don't know how to set it up. Please explain how to solve this problem to me. The answer is supposed to be 18 cm.
Explanation / Answer
B. P1-P2=0.5*density*(v22-v12)
=density of water*g*h=0.5*density of air*(
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