425_Physics ProblemsTechnical Physics

425_Physics ProblemsTechnical Physics - Chapter 14 P14.46...

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Chapter 14 427 P14.46 (a) For upward flight of a water-drop projectile from geyser vent to fountain–top, vv a y yf yi y 22 2 =+∆ Then 0 2 980 400 2 =+− + v i .. ms m 2 ej a f and v i = 28 0 . ms (b) Between geyser vent and fountain–top: P v gy P v gy 11 2 12 2 2 2 1 2 1 2 ++ = ρρ Air is so low in density that very nearly PP 1 == atm Then, 1 2 0 0 980 2 v i +=+ m 2 a f v 1 28 0 = (c) Between the chamber and the fountain-top: P v gy P v gy 2 2 2 2 1 2 1 2 = 10 0 1 000 9 80 175 0 1 000 9 80 40 0 1 000 9 80 215 2 11 = ++ + −= = kg m m s m kg m m s m kg m m s m MPa 32 e j af e j e j . P14.47 P v P 1 1 2 2 2 2 += + (Bernoulli equation), vA = where A A 1 2 4 = PP P v v v A A =−= − = F H G I K J 2 2 1 2 1 2 1 2 2 2 1 and P v ρ 1 2 2 15 21 000 Pa v 1 200 = . m s ; 21 48 0 0 . m s : The volume flow rate is 3 251 10 m s 3 Section 14.7 Other Applications of Fluid Dynamics
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