【正文】 （ ） A． 總體積 B．總質(zhì)量 C．總比容 D．總壓強(qiáng) 5．。(22222222122222111c fsAvQsftvvgvkkgvdlfzzhgvzpgvzpeL???????????????????????)(4)12(.)/()12450(1502)39。（ ） A． 質(zhì)量 B．體積 C．溫度 D．壓強(qiáng) 2．亞聲速流動(dòng)，是指馬赫數(shù) __________時(shí)的流動(dòng)。 (b) 1 ft below the water surface. (10 分 ) Solution: (a) (b) 1. 25. Water in a reservoir is discharged from a vertical pipe. If a=25 ft, b= 60 ft, c=40 ft, d= 2ft. All the losses of energy are to be ignored when the stream discharging into the air at E has a diameter of 4 in. What are pressure heads at B, C and D, if the diameter of the vertical pipe is 5 in? (10 分 ) )(1248)45(30s lbAhF c ???????? ?)( in43232 fthh p ??????)(2 4 96)45()30s in241( lbAhF c ????????? ?)()54(4451214)2430s i n 1(121)2430s i n 1(33ftAblAyIyycccp ???????????????)( in ftyh pp ?????gvzpgvzp EEEAAA 2222 ????????gv E2020)406025(02???????)/( sftv E ?????)/( 22 sftvAAvvv EBEDCB ???????gvzpgvzp BBBAAA 2222 ????????)( 22 ftgvaP BB ???????? ?gvzpgvzp CCCBBB 2222 ???????? 26. A nozzle that discharges a 60mmdiamater water jet into the air is on the right end of a horizontal 120mmdiameter pipe. In the pipe the water has a velocity of 4 m/s and a gage pressure of 400 kPa. Find the magnitude and direction of the resultant axial force the water exerts on the nozzle, and the head loss in the nozzle. (10 分 ) Solution: to the right 27. A 450ftlong pipeline runs between two reservoirs, both ends being under water, and the intake end is squareedged and nonprojecting. The difference between the water surface levels of the two reservoirs is 150ft. (a) What is the discharge(流量 ) if the pipe diameter is 12 in and f = ? (b) When this same pipe is old, assume that the growth of tubercles has reduced the diameter to in and that f=. What will the rate of discharge be then? (10 分 ) )()( ftzzPP CBBC ???????? ??gvzpgvzp DDDBBB 2222 ????????)()( ftzzPP DBBD ?????????? ??)/(164601 2 0 221212 smvAAv ????bxx FAPVVQF ????? 1112 )(??)()416()( 221211NVVQAPFF bxx?????????????????? ???)( 498004 0 0 0 022 2222211 mgvgvph L ?????????? ?Lhgvzpgvzp ?????? 2222222111 ???Solution: (a) (b) 一、單項(xiàng)選擇題 (本大題共 20 小題，每小題 1 分，共 20 分 )在每小題烈出的四個(gè)選項(xiàng)中只有一個(gè)選項(xiàng)是符合題目要求的，請將正確選項(xiàng)前的字母填在題后的括號(hào)內(nèi)。(2222212121211221122222111mkNppgvkgvdlfzzgvphgvzpgvzpL???????????????????)/(445980 0222222122121211221122222111mkNppgvkgvdlfzzgvphgvzpgvzpeL?????????????????????? 24. A rectangular plate 5 ft by 4 ft is at an angle of 30176。239。39。39。2 my p ?? 22. A diverging nozzle that discharges an 8indiameter water jet into the air is on the right end of a horizontal 6indiameter pipe. If the velocity in the pipe is 12fps, find the magnitude and direction of the resultant axial force the water exerts on the nozzle. Neglect fluid friction. (10 分 ) Solution: to the right 23. A horizontal 100mmdiameter pipe (f=) projects into a body of water (ke=) 1m below the surface. Considering all losses, find the pressure at a point 5 m from the end of the pipe if the velocity is 4 m/s and the flow is (a) into the body of water。2 my p ??)(33 39。239。2 NAhF cw a t e r ?????? ?)(509609800235201764039。2NAhF o il??????? ?)(9 8 0 0)21(9 8 0 0 212239。239。 (b) ? (10 分 ) Solution: (a) ∵ ∴ the flow is from B to A (b) ∵ ∴ the flow is from A to B fBA hgvzgPgvzgP ??????? 22222211 水水 ??)1100013600()(2)2(222)(22222221212211????????????????????????????????dlhhvggvdlhvggvgvdlhhhhghgzzgPPzgPzgPhfff??????????????水汞水汞水水水又vvv BA ???又BA HH ?)()(22mgvgvHHh ABf ???????)( 2750002)( 1700002222222mgvgvgvzpHmgvgvgvzpHEEEBAAAA????????????????????)()(22mgvgvHHh BAf ???????BA HH ?)( 27 50002)( 17 00002222222mgvgvgvzpHmgvgvgvzpHEEEBAAAA???????????????????? 16. A curved pipe is attached to a tank, and liquid flows out into atmosphere through the curved pipe. Determine the resultant force on the curved pipe. All the significant data are given in the figure. Assume an ideal liquid with γ =55 lb/ft3. Neglect the weight of the li