CHAPTER TWO MULTIPLE INTEGRAL
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1 CHAPTE TWO MULTIPLE INTEGAL Aft complting ths tutoils, stunts shoul b bl to: vlut th oubl intgl ov th givn ctngul gion fin th volum of th soli boun b th plns fin th of th gion boun b th cuvs ug oubl intgl fin th volum of th soli boun b th gphs ug oubl intgl fin th of th gion b ug oubl intgl in pol cooints chng th intgn fom Ct to pol cooints ov th givn gion G clcult f (,, V G fin th volum of th soli boun b th plns ug tipl intgl fin th volum of th soli boun b th givn sufcs ug tipl intgls in clinicl cooint fin th volum of th soli boun b th plns givn ug tipl intgls in sphicl cooint fin th mss of th lmin gion fin th mss n th cnt of mss of lmin gion boun b th givn gph n its nsit fin th cntoi fo th givn gion
2 Qustion Evlut th oubl intgl A ov th ctngul gion, :,. A u u u. Substitution Mtho: u u u Qustion Fin th volum of th soli boun b th pln,, n cooint pln. Solution Figu. ( Figu. (b
3 Volum of soli is givn b, V f (, A wh f (, : Thfo, V f (, A unit.
4 7 Qustion Evlut u u u Substitution Mtho: u u u
5 Qustion Lt b gion in th -pln n boun b,, Solution. Evlut A. Figu. A Qustion B ug th oubl intgl, fin th of th gion boun b th cuvs blow: 9,, Solution 9 Figu.
6 9 A, A A unit Qustion B ug th oubl intgl, fin th volum of th soli boun b ths gphs:,,, Solution Figu. ( Figu. (b
7 Volum, V f (, A A u u - simplif u u u - substitu u ( unit Substitution Mtho: u u u
8 Qustion 7 Sktch th gion boun b th gphs blow n fin th of th gion b ug oubl intgl in pol cooints :,,, Solution : A, A A = unit Qustion B chnging th intgn fom Ct to pol cooints, vlut : ( Solution :. - Substitution Mtho; u, u u u u
9 = (b Solution : Whn Whn ln ln ln tn ln sc tn ln sc tn ln sc sc
10 Qustion 9 Evlut th itt intgl blow : Solution : =
11 Qustion Clcult G V givn tht th gion G is, G, :,, : Solution : = Qustion Ug tipl intgl, fin th volum of th soli boun b th plns givn blow : ( Clin n plns =, + =. Ellips t th -pln, -intcpt t n -intcpt t. -limit : = - = -limit : -limit : = =. V= V G
12 - - B A A= with ius cicl of A O ug th substitution of A=
13 u B = Substitution mtho: u u u u Thfo, V V A B unit G (b =, =, =, + + =. Solution : Whn =, =.,, Whn =, = Whn =, =.,,.,, V V G + =
14 7 unit (c,, Solution : G V V
15 ( ( B A A= with ius cicl of A B = Substitution mtho: u u u u u
16 9 Thfo, unit B A V V G (,,, Solution : G V V unit - + =
17 A of cicl with ius A= B = u Substitution mtho: u u u u Thfo, V V A B unit G Qustion Evlut th itt intgl blow: (
18 (b ( (c ( ( (
19 Qustion Evlut th itt intgl blow: ( ( ( ( (b 7 ( ( ( 7 7
20 Qustion Clcult V G givn tht th gion G is fin s:,, :,, G (
21 Qustion Ug tipl intgl, fin th volum of th soli boun b th plns givn blow: (,,, Volum, V G A V unit ( ( ( ( ( ( (b Clin + = n plns =, + = =
22 Volum, V G A V ( ( ( ( ( ( Hlf of of cicl (smicicl with ius i.. Lt wh - - => cicl with ius
23 Thus, of th sh gion (i. smicicl is unit Altntiv mtho: Fo ( ( - - =
24 7 Thus, volum, unit V
25 Qustion Evlut th clinicl cooint intgls blow: ( 9 (b Fo A: Us substitution u u u u u A u u B u
26 9 Fo B: Thus, = A B Qustion 7 Fin th volum of th soli boun b th sufcs blow ug tipl intgls in clinicl cooint. (,, Volum, V - -
27 unit (b,, Volum, V ( ( - -
28 unit Qustion Evlut th sphicl cooint intgls blow: ( sc sc sc sc tn sc tn sc tn A B Fo A: Fo B: Substitut u tn u sc u sc u tn sc tn uu
29 tn Thus, sc = A B Qustion 9 Fin th volum of th soli boun b th plns givn blow: ( Sph =, con = /, n con = / Volum, V
30 Qustion Fin th mss of th lmin gion boun b th gph,,, n th nsit (,. = = Mss of th lmin gion (, A Qustion Fin th mss n th cnt of mss of lmin gion boun b th givn gph n nsit: (,, -is; (,
31 Mss of th lmin, m ( Cnt of mss = m M m M,, A M, ( 9 (
32 M (, A M ; m M m Thus, cnt of th mss is 9, 7. (b, cooints; (, Mss of th lmin, m = A Us oubl intgl in pol cooints; Thus, m
33 ( A M Us substitution u u ( u u u
34 7 A M Us substitution u u ( u u u Thus, cnt of mss = m M m M,,,,, Qustion Fin th cntoi fo th givn gions: ( Th tingl gion nclos b =, = n is.
35 Cntoi, A A A of, A of, A of = (( A A Thus, th cntoi is,,, =
36 9 (b Th gion boun b = n = A of gion 9 ( ( A A 9 ( - ( ( ( = (; ( ( = -, =
37 A 9 ( ( ( Thus, th cntoi is, 9 9, , 9 9,
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