Test 2A

# Test 2A - ‘Test#2 Math 241*—" Form A —‘ 100...

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Unformatted text preview: ‘Test.#2 Math, 241' *—" Form A —‘ 100 points? total *No calculators, No cellphonesmb PDAs. *Nb, questions duﬁng‘thextc‘st ume'ssﬂucre isra typing error ‘ *ﬁ’lease'fbegin eachqﬁObIem at the topr‘of a new page in the blue book *Writei‘you'r ﬂamesson the ofﬁft'side of the? blue book. *ShoW‘ 611' work Mark out'any work ghatryou do; not want‘gradcd,‘ 1; 'A functiOnvﬂx). satisﬁes the"f0116Wi11g'-diﬁe‘lte.ntial equation : dy _ 2, dxu— 3; 4y + 3 a?) (~6ptSQ)Whatare‘theeiwilibliium Splutions? b.) (8 ﬁts-Lifer what values airy-fathaﬁmction y(x) decreasing? c) (8_pts.)Given:an initial. cohdi’tﬁiﬂof y(0,)‘=1 ’and‘a'Step size, of Ax=lf2 , use 'Eulef’sxmethodltorapproximate;y(1). 2; (28 pts)"Solve.the‘-follow_ing differexitial equations a)’ 3%: 2M + 3W2 w(Q)=1 (explicit solution) b) 'x‘ + 16%:— = y(4) =_ 1. (itnplicit‘ solutiOn) y 3; 12 pts) A tank initially C'onta'insvl'ZOiggallons of brine, holding ,75 potmds‘of disSOJVed 'salti'n solution. ‘S'aIt water containing ,1 pound of salt per gallon is entering the at the rate-of? I’gallons'perrminuteand. brine ﬂows out at the merge, If the nﬁxngre is lgeptimifonn: by constant stirring, find the amount of salt :in'the tank'sﬂ) ‘at time t. ‘ ‘ 4.7 .For. the following ptoblem‘s’, W3ﬂ be sure to QQmpletCly set the problem where 21114th is 1§ﬁilloﬁdQJiSF=wotk out the integral. Draw aﬁﬁiémre‘that clearly shows ’y’ourisetriip; label youﬁiai‘iables? label the d'ireCtion‘df yourix Or y- axis, I‘abelf‘where For y'=‘0’ is, etc. a.) '(1'0‘ pts)‘H.owmuch wpfkiisedbnefto bring arl'oad ofore to the Surface=if a ' miner cable weighng 21b5/ft.-to haul a 100 1b bucket of ore up ‘a ‘ mine shaft thatrlis..8_00‘ ﬂ; deep. ‘ h b), (10 pts) Anxgate‘iﬁ an ifr'if'gationncanalsisein the farm of aftrapezo‘id. 3 11 wide Jat‘th’c Boﬁom,_5 f‘tagiwisieat the hp; With heightqu to 2 feet. It is placed V§1Tti9a11Y mime: canalswith the water extending .10 feet above the top of the; gate“ Thesdensjty'of watep'is 6247!) Ifta. Find the hydrostatic force on the-ég‘a'tcr e)- (10 pts)nAﬁhemispherical tankof 10-fth ﬁlled to a point 1 ﬂ. below the. top. Thealiq‘uid’svidensiitytis“ 621bs/ﬁ3. Find the work required to. pump all of the- liquid:o.11t_: through thetop of the 5-. Pts'lPriove/vexify that); = sifn(2t) "is not a solution of 1:"— 4x = 0 . W: ‘ , y.» a... 1' .3. v V _7 j: 7. ._ ' I ,u 11” _"‘- 3 . .. " -‘1"II‘I...‘..nmi’lH'dAr‘v 1 :1- :4 I: ;‘ bdlyﬁi‘ﬂ 4H.» _". ' ~ mam": ' 4 < —, ‘/_“.'2"7 . —--I--II\"- . 7: .-. ...'.‘.,::, 1‘" 1 In.» , .7 ‘ 1'. " . ‘ I ‘1 ‘ M “ i < 1;“— a! <7; v'v": .~ — III | I" !\!llll-Hl ‘ ‘ ‘ x.» “pp . .m I p .«w 75,! ‘ J: ‘53-”?! ,7 .- ...
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## This note was uploaded on 09/28/2008 for the course MA 241 taught by Professor Mccollum during the Spring '08 term at N.C. State.

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Test 2A - ‘Test#2 Math 241*—" Form A —‘ 100...

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