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CHAPTER 9 Gauss Elimination 245 >> A Test Bank is a collection of exam questions with solutions based on the textbook. 11, 2019 6 likes 12,989 views Download Now Download to read offline Education Full download : http://alibabadownload.com/product/numerical-methods-for-engineers-7th-edition-chapra-solutions-manual/ Numerical Methods for Engineers 7th Edition Chapra Solutions Manual << Numerical Methods For Engineers 5th Edition Solution Manual Pdf Free Download If you ally dependence such a referred Numerical Methods For Engineers 5th Edition Solution Manual Pdf Free Download ebook that will pay for you worth, get the entirely best seller from us currently from several preferred authors. Numerical Solution to the Falling Parachutist Problem Problem Statement. << /Length 2220 Solution Manual for 8th edition is provided officially and covers all chapters 1 to 32. /CropBox [0 0 612 792] /Resources 56 0 R /CropBox [0 0 612 792] /Type /Page /Pages 4 0 R /Rotate 0 Applied Numerical Analysis 7Ed - Curtis F. Gerald, Patrick O. Wheatley - Solutions Manual - Free download as PDF File (.pdf) or read online for free. numerical methods for engineers 6th & 7th edition solution manual download pdf. Instructors love Numerical Methods for Engineers because it makes teaching easy! /Length 3547 Designed by 123DOC, Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ CHAPTER 1.1 We will illustrate two different methods for solving this problem: (1) separation of variables, and (2) Laplace transform dv c g v dt m Separation of variables: Separation of variables gives g c v dv dt m The integrals can be evaluated as c ln g v m t C c/m where C = a constant of integration, which can be evaluated by applying the initial condition to yield c ln g v(0) m C c/m which can be substituted back into the solution c c ln g v ln g v(0) m m t c/m c/m This result can be rearranged algebraically to solve for v, v v(0)e( c / m )t mg e ( c / m )t c where the first part is the general solution and the second part is the particular solution for the constant forcing function due to gravity For the case where, v(0) = 0, the solution reduces to Eq (1.10) v mg e ( c / m )t c Laplace transform solution: An alternative solution is provided by applying Laplace transform to the differential equation to give sV ( s ) v(0) g c V (s) s m Solve algebraically for the transformed velocity PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ V (s) v(0) g s c / m s ( s c / m) (1) The second term on the right of the equal sign can be expanded with partial fractions g A B A( s c / m) Bs s ( s c / m) s s c / m s ( s c / m) (2) By equating like terms in the numerator, the following must hold gA c m As Bs The first equation can be solved for A = mg/c According to the second equation, B = A, so B = mg/c Substituting these back into (2) gives g mg / c mg / c s ( s c / m) s sc/m This can be substituted into Eq to give V (s) v(0) mg / c mg / c sc/m s sc/m Taking inverse Laplace transforms yields v(t ) v(0)e( c / m )t mg mg (c / m )t e c c or collecting terms v(t ) v(0)e( c / m )t mg e ( c / m )t c 1.2 At t = s, the analytical solution is 41.137 (Example 1.1) The relative error can be calculated with absolute relative error analytical numerical 100% analytical The numerical results are: step v(8) 0.5 44.8700 42.8931 41.9901 absolute relative error 9.074% 4.268% 2.073% The error versus step size can then be plotted as PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 10% 8% 6% 4% 2% 0% 0.5 1.5 2.5 Thus, halving the step size approximately halves the error 1.3 (a) You are given the following differential equation with the initial condition, v(t = 0) = 0, dv c' g v2 dt m Multiply both sides by m/c gives m dv m g v2 c ' dt c ' Define a mg / c ' m dv a2 v2 c ' dt Integrate by separation of variables, a dv v2 c' mdt A table of integrals can be consulted to find that a dx x x 1 a a Therefore, the integration yields v c' 1 t C a a m If v = at t = 0, then because tanh1(0) = 0, the constant of integration C = and the solution is v c' 1 t a a m This result can then be rearranged to yield PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ gc ' gm t c' m v (b) Using Eulers method, the first two steps can be computed as 0.22 v(2) 9.81 (0) 19.62 68.1 0.22 v(4) 19.62 9.81 (19.62) 36.75284 68.1 The computation can be continued and the results summarized along with the analytical result as: t v-numerical dv/dt v-analytical 10 12 19.62 36.75284 47.64539 52.59819 54.34314 54.88241 55.10572 9.81 8.56642 5.446275 2.476398 0.872478 0.269633 0.079349 0.022993 18.83093 33.72377 43.46492 49.06977 52.05938 53.58978 55.10572 A plot of the numerical and analytical results can be developed 60 40 20 v-numerical v-analytical 0 12 gm (1 e ( c / m ) t ) c 9.81(70) (1 e (12/70) ) 44.99204 jumper #1: v(t ) 12 9.81(80) (1 e (15/80) t ) jumper #2: 44.99204 15 1.4 v(t ) 44.99204 52.32 52.32e 0.1875 t 0.14006 e 0.1875 t ln 0.14006 0.1875t t ln 0.14006 10.4836 s 0.1875 1.5 Before the chute opens (t < 10), Eulers method can be implemented as PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 10 v(t t ) v(t ) 9.81 v(t ) t 80 After the chute opens (t 10), the drag coefficient is changed and the implementation becomes 60 v(t t ) v(t ) 9.81 v(t ) t 80 Here is a summary of the results along with a plot: Chute closed dv/dt v -20.0000 12.3100 -7.6900 10.7713 3.0813 9.4248 12.5061 8.2467 20.7528 7.2159 27.9687 6.3139 34.2826 5.5247 39.8073 4.8341 44.6414 4.2298 48.8712 3.7011 t t 10 11 12 13 14 15 16 17 18 19 20 Chute opened dv/dt v 52.5723 -29.6192 22.9531 -7.4048 15.5483 -1.8512 13.6971 -0.4628 13.2343 -0.1157 13.1186 -0.0289 13.0896 -0.0072 13.0824 -0.0018 13.0806 -0.0005 13.0802 -0.0001 13.0800 0.0000 60 30 0 10 15 20 -30 1.6 (a) This is a transient computation For the period ending June 1: Balance = Previous Balance + Deposits Withdrawals + Interest Balance = 1522.33 + 220.13 327.26 + 0.01(1522.33) = 1430.42 The balances for the remainder of the periods can be computed in a similar fashion as tabulated below: Date 1-May Deposit Withdrawal Interest $220.13 $327.26 $15.22 $216.80 $378.51 $14.30 $450.35 $106.80 $12.83 $127.31 $350.61 $16.39 1-Jun $1,430.42 1-Jul $1,283.02 1-Aug $1,639.40 1-Sep (b) Balance $1,522.33 $1,432.49 dB D (t ) W (t ) iB dt PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ (c) for t = to 0.5: dB 220.13 327.26 0.01(1522.33) 91.91 dt B (0.5) 1522.33 91.91(0.5) 1476.38 for t = 0.5 to 1: dB 220.13 327.260 0.01(1476.38) 92.37 dt B (0.5) 1476.38 92.37(0.5) 1430.19 The balances for the remainder of the periods can be computed in a similar fashion as tabulated below: Date 1-May 16-May 1-Jun 16-Jun 1-Jul 16-Jul 1-Aug 16-Aug 1-Sep Deposit Withdrawal $220.13 $327.26 $220.13 $327.26 $216.80 $378.51 $216.80 $378.51 $450.35 $106.80 $450.35 $106.80 $127.31 $350.61 $127.31 $350.61 Interest $15.22 $14.76 $14.30 $13.56 $12.82 $14.61 $16.40 $15.36 dB/dt -$91.91 -$92.37 -$147.41 -$148.15 $356.37 $358.16 -$206.90 -$207.94 Balance $1,522.33 $1,476.38 $1,430.19 $1,356.49 $1,282.42 $1,460.60 $1,639.68 $1,536.23 $1,432.26 (d) As in the plot below, the results of the two approaches are very close $1,700 Bi-monthly Monthly $1,600 $1,500 $1,400 $1,300 $1,200 M M J A S 1.7 (a) The first two steps are c(0.1) 100 0.175(100)0.1 98.25 Bq/L c(0.2) 98.25 0.175(98.25)0.1 96.5306 Bq/L The process can be continued to yield t 0.1 0.2 0.3 0.4 0.5 0.6 0.7 c 100.0000 98.2500 96.5306 94.8413 93.1816 91.5509 89.9488 88.3747 dc/dt -17.5000 -17.1938 -16.8929 -16.5972 -16.3068 -16.0214 -15.7410 -15.4656 PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 0.8 0.9 86.8281 85.3086 83.8157 -15.1949 -14.9290 -14.6678 (b) The results when plotted on a semi-log plot yields a straight line 4.6 4.5 4.4 0.2 0.4 0.6 0.8 The slope of this line can be estimated as ln(83.8157) ln(100) 0.17655 Thus, the slope is approximately equal to the negative of the decay rate If we had used a smaller step size, the result would be more exact 1.8 Qstudents 35 ind 80 m J s kJ 20 60 3,360 kJ ind s 1000 J PVMwt (101.325 kPa)(11m 8m 3m 35 0.075 m3 )(28.97 kg/kmol) 314.796 kg RT (8.314 kPa m3 / (kmol K)((20 273.15)K) T Qstudents 3,360 kJ 14.86571 K (314.796 kg)(0.718 kJ/(kg K)) mCv Therefore, the final temperature is 20 + 14.86571 = 34.86571oC 1.9 The first two steps yield 450 450 y (0.5) 3 sin (0) 0.5 (0.36) 0.5 0.18 1250 1250 450 450 y (1) 0.18 3 sin (0.5) 0.5 0.18 ( 0.11176) 0.5 0.23588 1250 1250 The process can be continued to give the following table and plot: t 0.5 1.5 2.5 y 0.00000 -0.18000 -0.23588 -0.03352 0.32378 0.59026 0.60367 dy/dt -0.36000 -0.11176 0.40472 0.71460 0.53297 0.02682 -0.33849 t 5.5 6.5 7.5 8.5 y 1.10271 1.19152 1.05368 0.89866 0.95175 1.24686 1.59543 dy/dt 0.17761 -0.27568 -0.31002 0.10616 0.59023 0.69714 0.32859 PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 3.5 4.5 0.43443 0.32087 0.45016 0.78616 -0.22711 0.25857 0.67201 0.63310 9.5 10 1.75972 1.67144 1.49449 -0.17657 -0.35390 -0.04036 2.0 1.5 1.0 0.5 0.0 -0.5 10 1.10 The first two steps yield 450 150(1 0)1.5 y (0.5) 3 sin (0) 0.5 0.12(0.5) 0.06 1250 1250 450 150(1 0.06)1.5 y (1) 0.06 3 sin (0.5) 0.5 0.06 0.13887(0.5) 0.00944 1250 1250 The process can be continued to give t 0.5 1.5 2.5 3.5 4.5 y 0.00000 -0.06000 0.00944 0.33094 0.77611 1.08058 1.09392 0.92288 0.82934 0.99017 1.33772 dy/dt -0.12000 0.13887 0.64302 0.89034 0.60892 0.02669 -0.34209 -0.18708 0.32166 0.69510 0.56419 t 5.5 6.5 7.5 8.5 9.5 10 y 1.61981 1.63419 1.41983 1.21897 1.25372 1.52584 1.81355 1.87468 1.67396 1.41465 dy/dt 0.02876 -0.42872 -0.40173 0.06951 0.54423 0.57542 0.12227 -0.40145 -0.51860 -0.13062 2.0 1.5 1.0 0.5 0.0 -0.5 10 1.11 When the water level is above the outlet pipe, the volume balance can be written as dV 3sin (t ) 3( y yout )1.5 dt PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ In order to solve this equation, we must relate the volume to the level To this, we recognize that the volume of a cone is given by V = r2y/3 Defining the side slope as s = ytop/rtop, the radius can be related to the level (r = y/s) and the volume can be reexpressed as V 3s y3 which can be solved for y3 3s 2V (1) and substituted into the volume balance 1.5 3s 2V dV 3sin (t ) yout dt (2) For the case where the level is below the outlet pipe, outflow is zero and the volume balance simplifies to dV 3sin (t ) dt (3) These equations can then be used to solve the problem Using the side slope of s = 4/2.5 = 1.6, the initial volume can be computed as V (0) 3(1.6) 0.83 0.20944 m3 For the first step, y < yout and Eq (3) gives dV (0) 3sin (0) dt and Eulers method yields V (0.5) V (0) dV (0)t 0.20944 0(0.5) 0.20944 dt For the second step, Eq (3) still holds and dV (0.5) 3sin (0.5) 0.689547 dt dV V (1) V (0.5) (0.5) t 0.20944 0.689547(0.5) 0.554213 dt Equation (1) can then be used to compute the new level, PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ y3 3(1.6) (0.554213) 10 1.106529 m Because this level is now higher than the outlet pipe, Eq (2) holds for the next step dV 1.5 (1) 2.12422 1.106529 1 2.019912 dt V (1.5) 0.554213 2.019912(0.5) 1.564169 The remainder of the calculation is summarized in the following table and figure t 0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10 Qin 0.689547 2.12422 2.984989 2.480465 1.074507 0.059745 0.369147 1.71825 2.866695 2.758607 1.493361 0.234219 0.13883 1.294894 2.639532 2.936489 1.912745 0.509525 0.016943 0.887877 V 0.20944 0.20944 0.554213 1.564169 2.421754 2.570439 1.941885 1.12943 0.93041 1.524207 2.345202 2.671715 2.202748 1.340173 0.902598 1.301258 2.136616 2.659563 2.406237 1.577279 0.943467 y 0.8 0.8 1.106529 1.563742 1.809036 1.845325 1.680654 1.40289 1.31511 1.55031 1.78977 1.869249 1.752772 1.48522 1.301873 1.470703 1.735052 1.866411 1.805164 1.568098 1.321233 Qout 0 0.104309 1.269817 2.183096 2.331615 1.684654 0.767186 0.530657 1.224706 2.105581 2.431294 1.95937 1.013979 0.497574 0.968817 1.890596 2.419396 2.167442 1.284566 0.5462 dV/dt 0.689547 2.019912 1.715171 0.29737 -1.25711 -1.62491 -0.39804 1.187593 1.641989 0.653026 -0.93793 -1.72515 -0.87515 0.79732 1.670715 1.045893 -0.50665 -1.65792 -1.26762 0.341677 2.5 1.5 0.5 0 V 10 y 1.12 (a) The force balance can be written as: m dv R2 mg (0) cd v v dt ( R x) Dividing by mass gives c dv R2 g (0) dvv dt m ( R x) PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 13 This result can then be substituted into the original differential equation, dV 3V k 4 dt 4 2/3 (4) The initial volume can be computed with Eq (1), V 4 r 4 (2.5)3 65.44985 mm3 3 Eulers method can be used to integrate Eq (4) For the first step, the result is dV 3(65.44985) (0) t 65.44985 0.08(4) dt 4 65.44985 6.28319(0.25) 63.87905 V (0.25) V (0) 2/3 0.25 Here are the beginning and ending steps t 0.25 0.5 0.75 V 65.44985 63.87905 62.33349 60.81296 59.31726 dV/dt -6.28319 -6.18225 -6.08212 -5.98281 -5.8843 23.35079 22.56063 21.7884 21.03389 20.2969 -3.16064 -3.08893 -3.01804 -2.94795 -2.87868 9.25 9.5 9.75 10 A plot of the results is shown below We have included the radius on this plot (dashed line and right scale): 80 60 40 20 V 2.4 r 1.6 10 Eq (2) can be used to compute the final radius as r 3(20.2969) 1.692182 4 Therefore, the average evaporation rate can be computed as k mm (2.5 1.692182) mm 0.080782 10 min which is approximately equal to the given evaporation rate of 0.08 mm/min PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 14 1.14 The first two steps can be computed as T (1) 70 0.019(70 20) 68 (0.95)2 68.1 T (2) 68.1 0.019(68.1 20) 68.1 (0.9139)2 66.2722 The remaining results are displayed below along with a plot of the results t 10 T 70.00000 68.10000 66.27220 64.51386 62.82233 61.19508 dT/dt -0.95000 -0.91390 -0.87917 -0.84576 -0.81362 -0.78271 t 12.00000 14.00000 16.00000 18.00000 20.00000 T 59.62967 58.12374 56.67504 55.28139 53.94069 dT/dt -0.75296 -0.72435 -0.69683 -0.67035 -0.64487 80 70 60 50 10 15 20 1.15 The pair of differential equations to be solved are di R i q dt L CL dq i dt or substituting the parameters di 40i 2, 000q dt dq i dt The first step can be implemented by first using the differential equations to compute the slopes di 40(0) 2, 000(1) 2, 000 dt dq 0 dt Then, Eulers method can be applied as i (0.01) 2, 000(0.01) 20 q(0.01) 0(0.01) PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 15 For the second step di 40(20) 2, 000(1) 1, 200 dt dq 20 dt i (0.02) 20 1, 200(0.01) 32 q(0.02) 20(0.01) 0.8 The remaining steps are summarized in the following table and plot: t i q di/dt dq/dt 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 -20 -32 -35.2 -30.72 -20.992 -9.0112 2.37568 11.01005 15.71553 16.33681 1 0.8 0.48 0.128 -0.1792 -0.38912 -0.47923 -0.45548 -0.34537 -0.18822 -2000 -1200 -320 448 972.8 1198.08 1138.688 863.4368 470.5485 62.12813 -277.034 -20 -32 -35.2 -30.72 -20.992 -9.0112 2.37568 11.01005 15.71553 16.33681 40 20 0.5 0 0.02 0.04 0.06 0.08 -20 0.1 -0.5 i -40 q -1 1.16 (a) The solution of the differential equation is N N0 et The doubling time can be computed as the time when N = 2N0, 2N N e (20) ln 0.693 0.034657/hr 20 hrs 20 hrs (b) The volume of an individual spherical cell is cell volume d3 (1) PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 16 The total volume is volume d3 N (2) The rate of change of N is defined as dN N dt (3) If N = N0 at t = 0, Eq can be integrated to give N N e t (4) Therefore, substituting (4) into (2) gives an equation for volume volume d3 N e t (5) (c) This equation can be solved for time ln t volume d N0 (6) The volume of a 500 m diameter tumor can be computed with Eq as 65,449,847 Substituting this value along with d = 20 m, N0 = and = 0.034657/hr gives 65,449,847 ln 203 (1) t 278.63 hr 11.6 d 0.034657 (6) 1.17 Continuity at the nodes can be used to determine the flows as follows: Q1 Q2 Q3 0.6 0.4 1.0 m3 s Q10 Q1 1.0 m3 s Q9 Q10 Q2 1.0 0.6 0.4 m3 s Q4 Q9 Q8 0.4 0.3 0.1 m3 s Q5 Q3 Q4 0.4 0.1 0.3 m3 s Q6 Q5 Q7 0.3 0.2 0.1 m3 s Therefore, the final results are PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 0.4 0.6 0.3 0.1 17 0.1 0.4 0.2 0.3 1.18 (a) Substituting Eq (1.10) into Eq (P1.18) gives dx gm (1 e ( c / m )t ) dt c Separation of variables gives x dx gm c t 1 e ( c / m )t dt Integration yields x gm gm t (1 e ( c / m )t ) c c (b) Eulers method can be applied for the first step as dv c 12.5 (0) g v 9.81 9.81 dt m 68.1 dx (0) v dt dv v(2) v(0) (0)t 9.81(2) 19.62 dt dx x(2) x(0) (0)t 0(2) dt For the second step: dv 12.5 (2) 9.81 19.62 6.2087 dt 68.1 dx (0) 19.62 dt v(4) 19.62 6.2087(2) 32.0374 x(4) 19.62(2) 39.24 The remaining steps can be computed in a similar fashion as tabulated below along with the analytical solution: t vnum 0.0000 19.6200 xnum 0.0000 0.0000 dv/dt 9.8100 6.2087 dx/dt 0.0000 19.6200 vanal 0.0000 16.4217 xanal 0.0000 17.4242 PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 10 32.0374 39.8962 44.8700 48.0179 39.2400 103.3147 183.1071 272.8472 18 3.9294 2.4869 1.5739 0.9961 32.0374 39.8962 44.8700 48.0179 27.7976 35.6781 41.1372 44.9189 62.3380 126.2949 203.4435 289.7305 (c) 50 400 vnum vanal xnum xanal 40 30 300 200 20 100 10 0 10 1.19 (a) For the constant temperature case, Newtons law of cooling is written as dT 0.12(T 10) dt The first two steps of Eulers methods are dT (0) t 37 0.12(10 37)(0.5) 37 3.2400 0.50 35.3800 dt T (1) 35.3800 0.12(10 35.3800)(0.5) 35.3800 3.0456 0.50 33.8572 T (0.5) T (0) The remaining calculations are summarized in the following table: t 0:00 0:30 1:00 1:30 2:00 2:30 3:00 3:30 4:00 4:30 5:00 Ta 10 10 10 10 10 10 10 10 10 10 10 T 37.0000 35.3800 33.8572 32.4258 31.0802 29.8154 28.6265 27.5089 26.4584 25.4709 24.5426 dT/dt -3.2400 -3.0456 -2.8629 -2.6911 -2.5296 -2.3778 -2.2352 -2.1011 -1.9750 -1.8565 -1.7451 (b) For this case, the room temperature can be represented as Ta 20 2t where t = time (hrs) Newtons law of cooling is written as dT 0.12(T 20 2t ) dt PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 19 The first two steps of Eulers methods are T (0.5) 37 0.12(20 37)(0.5) 37 2.040 0.50 35.9800 T (1) 35.9800 0.12(19 35.9800)(0.5) 35.9800 2.0376 0.50 34.9612 The remaining calculations are summarized in the following table: t 0:00 0:30 1:00 1:30 2:00 2:30 3:00 3:30 4:00 4:30 5:00 Ta 20 19 18 17 16 15 14 13 12 11 10 dT/dt -2.0400 -2.0376 -2.0353 -2.0332 -2.0312 -2.0294 -2.0276 -2.0259 -2.0244 -2.0229 -2.0215 T 37.0000 35.9800 34.9612 33.9435 32.9269 31.9113 30.8966 29.8828 28.8699 27.8577 26.8462 Comparison with (a) indicates that the effect of the room air temperature has a significant effect on the expected temperature at the end of the 5-hr period (difference = 26.8462 24.5426 = 2.3036oC) (c) The solutions for (a) Constant Ta, and (b) Cooling Ta are plotted below: 40 Constant Ta Cooling Ta 36 32 28 24 0:00 1:00 1.20 (a) dx dy vx vy dt dt 2:00 3:00 4:00 5:00 dvx c vx dt m dv y dt g c vy m (b) The first step, dx t 180(1) 180 dt dy y (1) y (0) t 100 0(1) 100 dt dv 12.5 vx (1) vx (0) x t 180 180(1) 147.8571 dt 70 dv y 12.5 (0) (1) 9.81 t 9.81 v y (1) v y (0) 70 dt x(1) x(0) PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 20 The second step x(2) 180 147.8571(1) 327.8571 y (1) 100 9.81(1) 90.19 12.5 vx (1) 147.8571 147.8571(1) 121.4541 70 12.5 v y (1) 9.81 9.81 (9.81) (1) 17.8682 70 These along with the remaining results can be tabulated as t x y vx vy dx/dt dy/dt dvx/dt dvy/dt 10 0.0000 180.0000 327.8571 449.3112 549.0771 631.0276 698.3441 753.6398 799.0613 836.3718 867.0197 -100.0000 -100.0000 -90.1900 -72.3218 -47.8343 -17.9096 16.4814 54.5411 95.6145 139.1633 184.7456 180.0000 147.8571 121.4541 99.7659 81.9505 67.3165 55.2957 45.4215 37.3105 30.6479 25.1751 0.0000 9.8100 17.8682 24.4875 29.9247 34.3910 38.0598 41.0734 43.5488 45.5823 47.2526 180.0000 147.8571 121.4541 99.7659 81.9505 67.3165 55.2957 45.4215 37.3105 30.6479 25.1751 0.0000 9.8100 17.8682 24.4875 29.9247 34.3910 38.0598 41.0734 43.5488 45.5823 47.2526 -32.1429 -26.4031 -21.6882 -17.8153 -14.6340 -12.0208 -9.8742 -8.1110 -6.6626 -5.4728 -4.4955 9.8100 8.0582 6.6192 5.4372 4.4663 3.6687 3.0136 2.4755 2.0334 1.6703 1.3720 (c) The following plot indicates that the jumper will hit the ground in about t = 5.6 s at about x = 670 m -150 y versus x -100 -50 200 400 600 800 50 100 150 -150 y versus t -100 -50 50 100 150 1.21 (a) The force balance can be written as m dv mg v v ACd dt PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 21 Dividing by mass gives ACd dv g vv dt 2m (1) The mass of the sphere is sV where V = volume (m3) The area and volume of a sphere are d2/4 and d3/6, respectively Substituting these relationships gives Cd dv g vv dt 4d s dx v dt (b) The first step for Eulers method is dv 3(1.3)0.47 9.81 ( 40) 40 10.0363 4(1.2)2700 dt dx 40 dt v 40 10.0363(2) 19.9274 dx 100 40(2) 20 dt The remaining steps are shown in the following table: t 10 12 14 x 100.0000 20.0000 -19.8548 -20.2450 18.6049 96.4813 212.7399 366.3269 v -40.0000 -19.9274 -0.1951 19.4249 38.9382 58.1293 76.7935 94.7453 dx/dt -40.0000 -19.9274 -0.1951 19.4249 38.9382 58.1293 76.7935 94.7453 dv/dt 10.0363 9.8662 9.8100 9.7566 9.5956 9.3321 8.9759 8.5404 (c) The results can be graphed as (notice that we have reversed the axis for the distance, x, so that the negative elevations are upwards 120 v 80 40 0 -40 10 15 v PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ -100 22 x 10 15 100 200 300 x 400 (d) Inspecting the differential equation for velocity (Eq 1) indicates that the bulk drag coefficient is c' ACd Therefore, for this case, because A = (1.2)2/4 = 1.131 m2, the bulk drag coefficient is c' 1.3(1.131)0.47 kg 0.3455 m 1.22 (a) A force balance on a sphere can be written as: m dv Fgravity Fbuoyancy Fdrag dt where Fgravity mg Fbuoyancy Vg Fdrag 3 dv Substituting the individual terms into the force balance yields m dv mg Vg 3 dv dt Divide by m dv Vg 3 dv g dt m m Note that m = sV, so dv g 3 dv g dt s sV The volume can be represented in terms of more fundamental quantities as V = d3/6 Substituting this relationship into the differential equation gives the final differential equation PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ dv g 1 dt s 23 18 v s d (b) At steady-state, the equation is g 1 s 18 v s d which can be solved for the terminal velocity v g s d 18 This equation is sometimes called Stokes Settling Law (c) Before computing the result, it is important to convert all the parameters into consistent units For the present problem, the necessary conversions are d 10 m s 2.65 m 105 m 10 m g 106 cm3 g kg 2650 cm3 m3 10 kg m 1 g 106 cm3 g kg 1000 3 cm m 10 kg m 0.014 g 100 cm kg kg 0.0014 cm s m 1000 g ms The terminal velocity can then computed as v 9.81 2650 1000 m (1 105 ) 6.42321 105 18 0.0014 s (d) The Reynolds number can be computed as Re dv 1000(105 )6.42321 105 0.0004588 0.0014 This is far below 1, so the flow is very laminar (e) Before implementing Eulers method, the parameters can be substituted into the differential equation to give dv 18(0.0014) 1000 9.81 v 6.108113 95,094v 2650 2650(0.00001) dt The first two steps for Eulers method are v(3.8147 106 ) (6.108113 95,094(0)) 3.8147 106 2.33006 105 v(7.6294 106 ) 2.33006 105 (6.108113 95,094(2.33006 105 )) 3.8147 10 6 3.81488 105 The remaining steps can be computed in a similar fashion as tabulated and plotted below: PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 24 t v dv/dt t v dv/dt 3.81106 6 7.6310 5 1.1410 1.53105 1.91105 2.33E-05 3.81E-05 4.76E-05 5.36E-05 5.75E-05 6.108113 3.892358 2.480381 1.580608 1.007233 0.641853 2.29105 2.67105 3.05105 3.43105 3.81105 5.99E-05 6.15E-05 6.25E-05 6.31E-05 6.35E-05 0.409017 0.260643 0.166093 0.105842 0.067447 1.23 (a) A force balance on a sphere can be written as: m dv mg Vg v v ACd dt (b) Dividing by mass gives Vg ACd dv vv g dt m 2m The mass of the sphere is sV where V = volume (m3) The area and volume of a sphere are d2/4 and d3/6, respectively Substituting these relationships gives dv 3 Cd g 1 vv dt s s d (c) At steady state, for a sphere falling downward Cd g 1 v s 4s d which can be solved for v g s d 1 Cd s Substituting the parameters gives v 4(9.81)2700(0.01) 1000 m 1 0.68783 3(1000)0.47 2700 s (d) Before implementing Eulers method, the parameters can be substituted into the differential equation to give dv 1000 3(1000)0.47 9.811 v 6.176667 13.055556v dt 2700 4(2700)(0.01) The first two steps for Eulers method are PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 25 v(0.03125) (6.176667 13.055556(0) )0.03125 0.193021 v(0.0625) 0.193021 (6.176667 13.055556(0.193021) )0.03125 0.370841 The remaining steps can be computed in a similar fashion as tabulated and plotted below: t v dv/dt t v dv/dt 0.03125 0.0625 0.09375 0.125 0.000000 0.193021 0.370841 0.507755 0.595591 6.176667 5.690255 4.381224 2.810753 1.545494 0.15625 0.1875 0.21875 0.25 0.643887 0.667761 0.678859 0.683860 0.763953 0.355136 0.160023 0.071055 0.0625 0.125 0.8 0.6 0.4 0.2 0.0 0.1875 0.25 1.24 Substituting the parameters into the differential equation gives dy 10000 x3 12(4) x 12(4)2 x dx 24(2 1011 )0.000325 2.5641 105 x3 12 x 48 x The first step of Eulers method is dy 2.5641105 (0)3 12(0) 48(0) dx y (0.125) 0(0.125) The second step is dy 2.5641 10 5 (0.125)3 12(0.125) 48(0.125) 0.000149 dx y (0.25) 0.000149(0.125) 1.86361 105 The remainder of the calculations along with the analytical solution are summarized in the following table and plot Note that the results of the numerical and analytical solutions are close x 0.125 0.25 0.375 y-Euler 0 1.86E-05 5.47E-05 dy/dx 0.000149 0.000289 0.00042 y-analytical x y-Euler dy/dx y-analytical 2.125 0.001832 0.001472 0.001925 9.42E-06 2.25 0.002016 0.001504 0.002111 3.69E-05 2.375 0.002204 0.001531 0.002301 8.13E-05 2.5 0.002395 0.001554 0.002494 PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ 0.5 0.625 0.75 0.875 1.125 1.25 1.375 1.5 1.625 1.75 1.875 0.000107 0.000175 0.000257 0.000352 0.000459 0.000578 0.000707 0.000845 0.000992 0.001147 0.00131 0.001478 0.001653 0.000542 0.000655 0.000761 0.000859 0.000949 0.001032 0.001108 0.001177 0.00124 0.001298 0.001349 0.001395 0.001436 26 0.000141 0.000216 0.000305 0.000406 0.000519 0.000643 0.000777 0.00092 0.001071 0.00123 0.001395 0.001567 0.001744 2.625 0.00259 0.001574 2.75 0.002787 0.001591 2.875 0.002985 0.001605 0.003186 0.001615 3.125 0.003388 0.001624 3.25 0.003591 0.00163 3.375 0.003795 0.001635 3.5 0.003999 0.001638 3.625 0.004204 0.00164 3.75 0.004409 0.001641 3.875 0.004614 0.001641 0.004819 0.001641 0.00269 0.002887 0.003087 0.003288 0.003491 0.003694 0.003898 0.004103 0.004308 0.004513 0.004718 0.004923 0.001 0.002 0.003 y-Euler y-analytical 0.004 0.005 0.006 1.25 [Note that students can easily get the underlying equations for this problem off the web] The volume of a sphere can be calculated as Vs r 3 The portion of the sphere above water (the cap) can be computed as Va h2 3r h Therefore, the volume below water is h2 Vs r 3r h 3 Thus, the steady-state force balance can be written as 4 h2 3 s g r f g r 3r h Cancelling common terms gives 4 s r f r 3 h2 3r h Collecting terms yields PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without permission Full file at https://TestbankDirect.eu/ Solution Manual for Numerical Methods for Engineers 7th Edition by Chapra Full file at https://TestbankDirect.eu/ f h3 r f h s f 27 43 r 1.26 [Note that students can easily get the underlying equations for this problem off the web] The total volume of a right circular cone can be calculated as Vt r22 H The volume of the frustum below the earths surface can be computed as Vb H h1 r r22 r1r2 Archimedes principle says that, at steady state, the downward force of the whole cone must be balanced by the upward buoyancy force of the below ground frustum, H h1 2 r2 Hg g r1 r2 r1r2 g b 3 (1) Before proceeding we have too many unknowns: r1 and h1 So before solving, we must eliminate r1 by recognizing that using similar triangles (r1/h1 = r2/H) r2 h1 H r1 which can be substituted into Eq (1) (and cancelling the gs) H h1 r2 2 r22 h1 r2 h1 b r2 H g H 3 H Therefore, the equation now has only unknown: h1, and the steady-state force balance can be written as 4 h2 3 s g r f g r 3r h Cancelling common terms gives 4 s r f r 3 h2 3r h and collecting terms yields f h3 r f h s f 43 r PROPRIETARY MATERIAL The McGraw-Hill Companies, Inc All rights reserved No part of this Manual may be displayed, reproduced or distributed in any form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their individual course preparation If you are a student using this Manual, you are using it without 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