..ooo T-Mobile Wi-Fi session 7:58 PM s.com Problem 15.62 MasteringPhysics A Blow

Question

..ooo T-Mobile Wi-Fi session 7:58 PM s.com Problem 15.62 MasteringPhysics A Blowhard 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. Part A If a person blows air at this rate through a drinking straw with a diameter of 0.47 cm, what is the speed of air in the straw? Express your answer using two significant figures. 4.62 10-10m/s Submit Incorrect; Try Again; 4 attempts Give Up remaining Part 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

Explanation / Answer

Solution-1. Here:d is diameter, A is the area and v is the speed ,

Area*speed is the quantity of air flowing per second.

A v = d² v/4 = 1.5 liters /second = 0.0015 m^3/s

v = 0.0015*4/(*0.0047^2) =86.50 m/s

2 )
By using Bernoulli equation

v^2/2 = hdg :here is density of air and d is density of water

h = v^2/ (2dg) = 1.25*86.50^2 /(2*1000*9.8) =0.4772 = 0.48 m

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