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H {èa ü (′1 ( ) 3 30cos1 17.1)(dsin2 3 2 1 0 2P )6( 2d α ωω π π απ ++ == ∫ + UttUU P ? 0 6 5 d == U π α b ?[ ?M?o V e? @è ^  e??¥MMS?1 6 5 ~0 π b {è @¥ ü (′1 RUI dd = a?C5íq¥è @ ü (′1 3/ d I b =a ?M B T ? e? @è ^ ?o?C5¥|¤B ¥? @è ^? |F? @è ^b ?m 8.20 ?M?o V e ? @è ^?¥è ^b ?o?C5¥¤B ¥? @è ^?T F? @è ^b ?m 8.22 ? U¥è ^b m 8.22 F? @è ^ ü |F? F V e? @è ^1 ó  ?ü?  ?M B T ? e? @è ^ ? m 8.23 ? Ub m 8.23 ?M B T ? e? @è ^ ? VS1aVS3aVS5?C5F? |F VS2aVS4aVS6?C5F? Fb ?M B T ? e? @è ^B?Dè? ?¤ H9 ^1 óB?¥è? [hlè @¥ ??? £ è @ ??? Hμ¥?é V[ AT ^è??¥bè??μ¥ f ?/ ?T |F # F?C5] Hé? e? e??1 α * 1?? ?M ? e B T? @è ^ü ^ F ?M?o V e? @è ^¥1 óyN? @èa d U ?1?o? @vB' αcos34.2 2Pd UU = m 8.24 ? U ^m 8.23 ? Uè ^¥èaaè @o?[#(? ? ¨?mb m 8.24 B T ? e? @è ^è aaè @o?[#(? ? ¨?m m??? 0=α ¥yT ?'(? ? 1 ?DM??b  |F¥?C57y BMèa ?  e M1?] H?μ(? ? ?M ¥?C5ü(??Yb  F¥?C57y BMèa ?  e M1μ] H?μ(? ? ?M ¥?C5ü(??Yb  1tω H AMèa?? BMèa1μ ?Tó VS1aVS6 (? ? 5 VS1aVS6 ?Y ?[ 2~1 tt ωω = VS1aVS6?Y è @V AMü VS1aμ? VS6í? BM AMè @1? BMè @1μ è @1μV U è @¥? LZ_Dm  ? U?Z_MQ b  2tω H A Mèa? ^1?? C M èa 7 S1 B Mèa÷μ  ?T 2tω H ó VS1aVS2(? ? 5| VS1???Y O VS2?Y VS2?Y P VS6y? sQ_è a71è @V A Mü VS1aμ? VS2 í? C M ?[ 3~2 tt ωω = VS1aVS2 ?Y AMè @1? CMè @1μb  3tω H CMèa ˉ?μ BMèa 7 S1 A Mèa1? ? 3tω H Yó VS2a VS3 (? ? 5 VS2 ???Y O VS3 ? Y VS3?Y P VS1y? sQ_èa71 ?[ 4~3 tt ωω = VS2aVS3 ?Yè @ V BMü VS3aμa VS2í? CM BMè @1? CMè @1μb GQ ?w 5~4 tt ωω = VS3aVS4 ?Y 6~5 tt ωω = VS4aVS5 ?Y 7~6 tt ωω = VS5aVS6?Y 8~7 tt ωω =? ^ VS1? VS6?Yb òMè @ ?m 8.24(b) ? Ub? H? @ {èaKú |F7y  {èao ? ^èao????¥ ?L F7y  {èao? ^èao? ^èao?μ ??¥ ?L ?M B T ? e? @è ^ {èa ?′ ?? |FD F {èa- ?bm 8.24(d) U ? H¥ {èao?b ? e?? αMM H {èa¥o?? ü (′|?"? 3M?b - ??) ? +?μ}V?¥ V e? @è ^b?tè ^¥+?? a?S? ?/V ? U è ^ ? +? a?S? ?M?oè ^ è ^Ke? ò[·S??μ o a¨?l? q? {èao?1 p?ú¥?? ?M B Tè ^ ò[? ??z èa ?? ? q ?v K a??l? q¥è ^ ° @짥?M B Tè ^ o¨Bo?C5¤Le? ò[? ??z B?¨?l? q¥Qè ]μ ?M?o V e? @ è ^ ò[·S?B? ¨¤? ?M B T V e? @ è ^ ò[·S?z íq? s¥? ′èaK? K a??v? qúaè ^ 9-B?l? qè ^?a5ê¨?M B Tè ^?v? qè ^5?a5 I n ?M B Tè ^oμ ?+ y f ?/?ê¨  eL ^b è ?μ1 p? q?lò[·S 1 p?ú5 V?¨?M?oè ^b ? B Tè ^ ^ê¨? e B? ^ ? e B1? è ^¥1 p %?b ?T??1 pè ^ ? yT?? @ ?] H? ?yT? IM ?5ê¨ ? e B?° @è?μB?9 ?¨ ? e BB?1 p?ú¥μ V?¨? e Bb [ 4¥? ^ꨥBte5 8ê¨ H?? μ?éa ? vlaè÷ f ?a íq¥! f ??é? 8s1?a ? ?? a ??b  IM  ?¨?C5è ^ü° @èM?? @è????? @¥ I_V??-1 IMü° @èM?? @è¥ ??S IM b ; V LC? @? V LC IM¥?C5è ^Yè?1M @ b μ÷ IMii ?Tü IM ¥? @§¤?? @è÷  ü° @è IM1] ? q¥? @è Q ??è?¥è ^bμ÷ IM ?¨?° @è?¥ V I? ?aL ? Ts?è?¥1)? ??Z ?b í÷ IMii ?T IM ? @§¤?μ ü° @è IM1 B ? q VM ? q¥? @ èóμ¥è ^bí÷ IM Yè¨?M ? a? @è?¥M ?? ??Z ?b í÷ IMè ^ Baí÷ IMè ^¥yTe ? 1.í÷ IM ¥e?yTe ? í÷ IM  ?ü° @èM?? @è¥e ? V[¨m 8.25 ? U¥ 71è ^ ? a üb m 8.25 í÷ IM ¥e?yTe ? ? 71 S1aS4>?7 71 S2aS3 7 Hè @Vè÷?ü S1aμa S4í? è÷μμè @Z_ ?m? LLph ? Ub üVB? HWW?| 71 S1aS4>?i] H| 71 S2aS3u 75è @Vè @? üV S3aμa S2í?è÷μμè @Z_ ?m?′Lph ? Ub ?T[M?¥ HWW??91>?? 7 71 S1aS4? S2aS35μ ¤m 8.32(b) ? U¥? @èb? @è¥ ? q | %? F 71 ? e =>?? 7¥Q ?'?M  F 71 ? e =>?? 7¥Q ?ü V?M {èa¥ ? q?ü ^ ?¥M ?T¨b ? üA1¤??ú ? q¥? @è ?¨μ(? 71 ^? V ?S?¥A??¨?? 8 71? ? LCb 2.?M?C5 B T IM  m 8.26(a) ? U1?M B T IM 'è ^mb m 8.26 ?M B T IM 'è ^m μ V ?1èE?è???μ1BèE? Hμè @¥o?Dμèao?? ?M ?b ?T1??μè @o?|ìa IM  {èao?B??b è ^?¥=5μ ?T¨ B ^ Q ?T¨ 'üμ?¥í? ? Q ?í° @è÷ = ^]? IM ¥ {?′Vs1?V° @è÷èa[?? {èa1??′b =a?Mí÷ IM ¥èa e? ? @M ?? ?1 p ? f U ?M 's?è?¥ { ? èaDèa ? q¥1 è 1"? ?V??? ?M b'?M ? q HA??M èa¥vlyN1 p IM A ?é?èa e?b  e?ZEμ 1. e? IM ¥ { ?° @èa ?Tè÷1? @5 V[YV V e? @è ^ü? @M? V?¥° @ { ?? IM V 7 e? IM ¥ {? @èab?? -° -?M ? ?è¨b ?1° @è÷ 5 V ?¨° @M?? @ e? IM Wo ?M° @ { ?èa¥vlb ?tZE¥ ?? ^ IM  {? @èao?¥~o?s ?" {èa¥h 79Fb 2. ? z?? PWM ?T P VS1D VS4 VS2D VS3YVú ??? e? ???? ù =×ˉ?Y?1 N Q5  {èao?1B" $??¥ ? ?  ?o  ?m 8.27(b) ? U ? H N=5b m 8.27 ? z?? IM ¥ {o? 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FB?|1μ¥èa   4(? ? ¥ -1÷?5|?y?aè a?y í¥M?7/??C5¥(? HW -a?Báb m 8.32 ? -?÷ (? HWμ êμ è ?m 8.32? ?T??ìa?¥?M P¤?C 5 ?1 p¥(?èaV g1 u 4ú? g2 u ?C5 7 S(?¥ HWü 1t VM? 2t  Vn(? HWwt   5?C5? @?MM e?¥(?è ^?(? ?  ????è ^]? ? ?¥ HW?? ? ü×1 - aM? MM MM¥S?1@ zb =a?2?85(?è ^ ??2?85F?¥(?è ^ μL ^e?a V La -÷a F? ? ? <a ?  ? {la??ê? ?z?a?b ?[ 50A [/?C5¥?M ?M? e B T"d?¤ ?<W¥?¨b 1?2?85¥2D+? 12 ?2?85 ^B?+ y¥??8 q ?μ ??è ?B?? ? ?# ?? ?=5b ?¥??D ?Y ?M5M ??+?D?8 ?5?] 2 ?m 8.33(a) ? Ub  a2  bm??|  c?rè ^ m 8.33 ?2?82  N?A??8 ?¥B§? ? b11?B b21?=A ?¥ 6B§¨?á ?v ?E 1 ? P?é??  eby1?  eD b1? b2-W ^ B? PN2 ?[M??Bo=5b ?2?85¥m??|??rè ^ ?m 8.33(b)? (c) ? Ub ?-W ^A ?' &¥ m 8.34 ?2?85¥+? wL èE?BèE?b?rè ^?¥ 1b r 1?BD? -W¥èE b2 r 1?=D? -W¥èEb ?T ?WF ?B?èa bb U  b1¤μa b2¤? 5 A?èa1 bb b2b1 1b A U rr r U + = T? 2b1 b1 b rr r + =η ?1?2?85¥sa" ? sa1  ? ^B??×1¥? ?  ?′D50¥2μ1B? 0.3j0.9-Wb 2+? ?2?85μ ?+?èa P U ii?′èa V U ii!?èab +? wL ?m 8.34 ? Ub ??  e ?F?_èal??′è a H b1 r ?C?v¥E′? 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