13. [1pt] Water is flowing in a straight horizontal pipe of variable cross secti

Question

13. [1pt]
Water is flowing in a straight horizontal pipe of variable cross section. Where the cross-sectional area of the pipe is 4.6X 10-2m2, the pressure is 2.10 X 105 Pa and the velocity is 0.66 m/s. In a constricted region where the area is 7.00X 10-4m2, what is the velocity?

Answer:  

14. [1pt]
What is the pressure (in Pa)? (Assume an ideal fluid)

Answer:  

15.[1pt]
During high winds, the atmospheric pressure inside a house may blow off the roof because of the reduced pressure outside. Calculate the force on a square roof of side 22.0 m if the wind speed over the roof is 31.0 m/s.

Answer:

Explanation / Answer

13.

first area = A1 = 4.6 x 10-2m2

first velocity = V1 = 0.66 m/s

second area = A2 = 7.00 x 10-4 m2

using equation of continuity ::

A1 V1 = A2 V2

(4.6 x 10-2) (0.66) = (7.00 x 10-4 ) V2

V2 = 43.4 m/s

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