Class20_HW1 - 9‘ 2'2 4.73 The wind blows across a field...

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Unformatted text preview: 9‘, 2'2 4.73. The wind blows across a field with an approximate velocily pmfilc as Shawn in Fig. P4.72- Um: Eq. 4.”) with the parameter .9 equal to the velocity to determine the momentum fluwrate across the vertical surface A—B. which is of unit depth into the paper. ma 20 m3 = E)? Via’y 1:} Butt, V: Jig" 1% For 0-fyswf't'(:9-, 1/:0‘3117”) V=N§qfly=mJ and 1/: 5.: far yemfi‘ 723%; m 1 20 3m :0 EM = Pifl'fiérfly +I05Wy} M2 15137] ”1” ] 0 f9 0 0 .5 4 A =0.002.38 igfrfiso {ii +2250 52*]! = wees—L’s} 573,43 (5 saw ...
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