hw 2 - CENG lOlA FALL 2009 HOMEWORK # 2 D.MILLER 10/1/09...

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CENG lOlA HOMEWORK # 2 D.MILLER FALL 2009 10/1/09 Due: Thursday, 10/8/00 by 5pm at 380 EBU II, or earlier in class. Read: Chapters 3,4,5 (you are NOT responsible for sections 5.3 and 5.4) and Chapter 6 Problems: 1.27; 4.2; 4.21; 5.7; 5.10 (neglect plate weight and gravity effects); AND: Special Problem A: Water flows in the 120 0 horizontal pipe bend as shown, entering with r."\ velocity V I = 4 m1s at gage pressure Pg = 2 atm , and exiting at atmospheric pressure. ..-/' - Inlet and exit pipe flow areas are AI = 0.2m2 and A2 = 0.1m2 . Determine the forces (kN) Fx and Fy necessary to hold the pipe bend stationary. (1 atm = 101 kN/~2 = 101 kPa) Selected Answers ( ~ means "close to", +/- 50% ) : 1.27: LV> ~ 40 N/m (note - soap bubble has 2 interfaces!) 4.2 (b): Q = ~ 25 m 3 /s (4.2 a,b involves integrating equations 3.3. and 4.3 ; for b assume unit plate width); 4.2la,b :V ~ 2cmls; 5.7: Fx ~ - 6000 lbf; 5.10 : Fx~ 140 lbf, Fy ~ 80 lbf; A: Fx ~50 kN, Fy ~ 5 kN EXAM #1 : The first exam wiIl be next Thursday, 10/8/09. The exam will be closed book and will cover all assigned reading and homework in chapters 1 and 2. Comments on
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This note was uploaded on 10/22/2009 for the course CENG 101A taught by Professor Krashinov during the Spring '07 term at UCSD.

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