Question

Written problem: I find that I can blow 1000 cm3 of air through a drinking straw in 1.3 s. The diameter of the straw is 5 mm. Find the velocity of the air through the straw.

Answer 1

Below

Step-by-step explanation:

Diameter of straw = .5 cm then the radius = .25 cm

AREA of the straw = pi r^2 = pi ( .25 cm)^2 = .19635 cm^2

Now we need to find the LENGTH necessary to have a volume of 1000 cm^3

1000 cm^3 = L * . 19635 cm^2

L = 5.092.958 cm <=== your blowing covers this distance in 1.3 s

5092.958 cm / 1.3 s = 3917.7 cm / s = 39.2 m/s