新高考高中物理竞赛专题1力学50题竞赛真题强化训练解析版

《新高考高中物理竞赛专题1力学50题竞赛真题强化训练解析版》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

ὃ
ᱥᳮ⚪150⚪⚪ᓄஹᓫ⌱⚪1.2019•ᐰ•
!"#$%&ᑴ(ᳫḄᢈ,஺᝞/ᡠ1"ᙠ34ᙢ☢7
8Ḅᙢ9":ᐸ<=>ᩭ"@A8B0CD"Eᙢ☢FGHឋJK"ᓽᙠMN9ᔣA8ᜧQRS஺T☢UVWXḄᨵZA.Rὃ⇋]^_`"ᙢ☢ᨵ᥅b"ᑣJKdefg=hijklB.Rὃ⇋]^_`"ᙢ☢ᨵ᥅b"᥅bmᦪB஻"ᑣ(ᳫH>p"A89ᔣEMN9ᔣḄᜳrḄᨬᜧthuBarctan//C.Rὃ⇋]^_`"ᙢ☢ᐝw"ᑣ(ᳫ7MNH>D.ὃ⇋]^_`"(ᳫḄxyzgCDy{|ூ~ᫀ௃Cூ᪆௃ூ௃A.=hᒹ==hE<==h"᥅biᜫ=h"ᓽklḄ==hQḄ<==h"ᦑA⌱⚗┯B.ᙠJKA8ᔣ"tᢝjB2l᥅bjḄᨬᜧu᥅bḄᨬᜧḄ¡A8BZf¢=N£ᙠ"ᓽ⌕¥ᳫ¦§Ḅ<=A8¨©ᜧ"ª«H>¬e"A8MN9ᔣḄᜳrᨬᜧu®Barctan2“
"⌱⚗B┯C.Rὃ⇋]^_`"ᙢ☢ᐝw"ᑣ(ᳫxᙢ¡9ᔣR¯"ᑣ(ᳫ7MNH>"⌱⚗CWXD.ὃ⇋]^_`"(ᳫ°┐²<"ᑣᐸxyzgCDy{³"⌱⚗D┯஺ᦑ⌱C஺2.2020•ᐰ•
ᨵ´µ᪵Ḅ·¸"ᐸ⚔ºᵨ¼⚓¾ᙠ>"ᙠ´·fḄ¿ÀᵨÁÂmÃ"ÄÅᡂ%ÇÈ·஺᝞/ᡠ1"É´µ᪵ḄÇÈ·ᵬஹËDÀ¡ᙢ☢Ì"ᵬ·ᵨḄÂÍÎÏ஺ÐÇᐜஹeÒᙠᵬஹË´·⚔Ó"TÔUVWXḄZ

1A.ᵬ·ᡠ¯ᙢ☢Ḅᢝ7×ᜧB.ᵬஹË´·ᡠ¯ᙢ☢Ḅᢝ7fÙC.¸ÛÜÝ"ᵬ·ᡠ¯ᙢ☢Ḅ᥅b7gË·ḄᜧD.¸ÛÜÝ"ᵬ·ᡠ¯ᙢ☢Ḅ᥅b7gË·ḄQூ~ᫀ௃Bூ᪆௃ூᑖ᪆௃ூ௃à⚪ὃáâãäåḄ¯ᑖ᪆஺ÉÇÈ·EÇæB᦮è"ᵬஹË´·ᡠ¯ᙢ☢ḄᢝÙ´·EÇḄé¬E"ᦑᵬஹË´·ᡠ¯ᙢ☢ḄᢝfÙ"A┯"BWXÁÂêᐰÜÝ"᦮èᑖ᪆t"ÇÅ·¡9ᔣÌR¯ᙢ☢Ḅ᥅bæᵨ"CஹD┯஺ëஹì⌱⚪3.Z2019•ᐰ•
᝞/ᡠ1"!"#$%ᑭᵨᙠóôR
8Ḅ¡"ᙠóõᔿ÷R⚣᳛úû"üýþÿḄᢈ஺ḄᨵAAaA.234,ᑣᔿᩭḄ"#⚣᳛&234B.ᔿᩭ"#⚣᳛)⌕ᵫᙠ-."/0ᡂḄ2/⚣᳛ᩭ34C.-.2/ᙠ☢▬89/⁚;ᙠ<▬89/ῳD.-.?@?;AḄ"#⚣᳛@ூCᫀ௃BCூF᪆௃ூHF௃

2AD.ᵨᘂᔿKL9☠N☢Ḅ-.A";-.@OPQ@R;AḄ"#⚣᳛@;#S@;TUᐵ;ᑣAD┯XYB.ᔿᩭ"#⚣᳛)⌕ᵫᙠ-."/0ᡂḄ2/⚣᳛ᩭ34;2/⚣᳛@;ᑣᔿᩭḄ"#⚣᳛@;⌱⚗BYC.-.2/ᙠ☢▬89/⁚;ᙠ<▬89/ῳ;⌱⚗C஺ᦑ⌱BC஺4.2020•ᐰ_•`abᵬஹefgᙠhijklmnohp30m/shᔣrs;ᵬgᙠt;egᙠu;fgvw100m஺x=0Ly;ᵬஹefgḄzp{L|}ᓄ᝞ᡠ஺Qᔣᔣ;☢Ḅ9A.f=3sLfgvwᨬ8B.f=9sLfgvw100mC.3~9sᑁegᒴpQD.f=9sLegpூCᫀ௃CDூF᪆௃ூHF௃A.a-fḄ☢⊤p}ᓄ;ᙠ3sᵬgḄp}ᓄAv=at=-10x3=-30m/s}LᵬgḄp;ᵬgḄegḄx=1^,=30x3=90m2ᑣLfg|ḄvwAx=100-90+45=55mLegnᵬg;egpᵬgpᜧ;vwi;A┯X;BCD.ᵬg9sḄpv=(i/=5x6=30m/s22

3eg9sḄpv=v-at=30-5x6=Om/s32egᙠ3~9sᒴpQ;¢ᵬefgᙠ3~9s£⌮ᔣQ;ᜧo¥;9sḄvw¦3soh55m,ᦑB┯XCDYᦑ⌱CDo`ஹ§-⚪5.2021•ᐰ_•`abi©஻«¬RḄᙳ©ᳫ☟±ᙠj²☢n;ᳫ¦²☢|ḄQ᥅´ᦪ஻;ᨬᜧ☟᥅´¶¥·¸Q᥅´¶;¹¶zpᜧg஺ᵨi᪷j»ᩚ½ᡭᳫ;½ᡭ¿·ᳫÀᡠᙠḄj☢n;½ᡭᔣÁᳫÀ;½ᡭL|᩽O;ᳫÃÄḄjÅp஺x½ᡭÆÇÈÉÊL|uᳫÈÉËÌQ;ᳫÈÉËÌQLḄp«ÎᳫÏᳫÀḄ7ÐQÑÒ஻2஺ூCᫀ௃"-Ô/pmg1mூF᪆௃ூHF௃পᵫ·½ᡭᔣÁᳫÀ;ᡠᳫÖÃÄjQ×p;ᐸᜧ%='জm᪷ÙÚÛÜÝ4ÞÄᳫjQḄzpᜧa=ঝᵫ·᥅´¶ßḄàᵨ;ᳫÃÄáâzp;ᐸᜧ"R_ᔆMf_"R2Rঞ5ãx½ᡭÆÇÈÉÊL|fᳫÈÉËÌQ;LᳫäåÐQḄæpᜧ¥·jQLḄpᜧ;᪷ÙQçèÞᨵv-at=[itRটQὶêজঝঞটFÄ/=ñঠ[2]ᳫÈÉËÌQLḄpv=at=—(6)Im6.2020•ᐰ_•`abój☢ôõUæᵯ/ᐰ÷ø;÷ø/Tᐭø/|úᙠᵫ·÷ø⌼ᡂḄ¬ü/?Ḅoý}஺i⁂ᙠᐸ☢25mḄ᪽ᩚᨵᜩᔣᜐḄ⚔ᦈ

4ᙠ2~4m"ᑁḄ$ᵯ஺')*+ᦈḄ,-L./2000m,⚔ᦈᡠᦈᑮḄ23.45'6=2000m8ᜫ:$ᵯὶ<஺⚔ᦈ=150m஺ᜩ>Ḅ$ᵯ?ᨵ@AᑖCDEᑮᦈF@AᑖG☢HIDEᑮᦈJᑡḄLMNO—m,P$ᵯḄQ▭—m஺ூUᫀ௃3.743.74ூX᪆௃ூZX௃JᑡḄDEᐵ<᝞]ᡠ^8=J.+Z,+/z
2-^Lr+H-h2=3.74m_ᵫabᜫᑣ23234_Jᑡdef4⌼ᡂ_ijᨵS=nAk_2~4m,_iQ▭3.74m7.2019•ᐰn•opqr]?ḄABCstouvwA8tஹACtḄ?y+ஹC,,zwA4ஹARḄ?y{ஹC……᝞i}~:᪀ᡂ$▲ᑁstouv<ᑡ.ᡠᨵḄ2BCtḄe஺stouv<ᑡḄ<+8ctḄ-ூUᫀ௃424ூX᪆௃ூZX௃⚪stouv<ᑡḄ

5C14=2m+m----=4/w1——2A8ACḄeJὅḄ+BCḄ-L஻sin6¥ro=@a24BCஹB£ஹ32G……ᔜtḄ□ஹ!®ஹ¥ஹ9eᔜtḄ+3ctḄ-0ஹ-asin60'9>asin60°ஹ9MAsin60°2<Ḅ+BCtḄ-³Z஻µᕣ2323஻iasin60°masin60°1---------+---------—++L4m4m஺+©+©2GV33=—aH-------ci+88■"»&ᵨ+>¾ᜧÀ3ᑁᔜ⚗?ḄÂ@⚗eÃ:©6+0+…¾ᜧÀ3ᑁᔜ⚗?Ḅ³⚗eÃ:8¾ᜧÀ3ᑁᔜ⚗?ḄÂo⚗eÃ:"9+Å/=2+++888.2020•ᐰn•opqrÆÇÈÉᵯḄᦔ᳛ᡃnÍÎÏ⌲ÑÒᵨÓ᫔-¥ᓽÖ⁚ÈØᱏ+ÈÚ☢ÛÜḄᜳu'ÈÞß8àØᱏḄáÈ☢âãᜧ'ÈÞäå@æ▲8àØᱏḄáÈ☢âfßµçæᐸè>é᳛rêᑴÈÉᵯìíæ᫔-êᑴÈÉᵯ஺]aᡠ^?ÈÉᵯîᱏØᱏ54m,æ᫔-ÈÓ᫔-ÈḄé᳛+ÈÞḄñjᐵ<᝞]bᡠ^ᡠᜐᙢôᐰᜩÈÞᙳ7.5m/s,÷ø1.29kg/m3,᯼Ḅýþÿ2.9x17j/kg஺ᐭ᫔ᑴᵯḄḄ!"#$%&ᐰ()kg᯼ᡠ,-Ḅ./012᫔ᑴᵯ3$4ᓄᡂᵯ$Ḅᦔ᳛.%»

61oo᫔5oo4oo3oo<᫔2oo1OO0510152025=/(nvs)9a9bூ?ᫀ௃3.1X1O216ூB᪆௃ூDB௃ᙠFᑁHIᐭᵯḄJK/m-pvstᑣHIḄJ#$2=3600x7.5x3.14x542xl.29xlx7.52=8.97xlO9JE=-mv22ᑣMᦔ()Ḅ᯼ḄK/8.97xlO9.,=-----------=3,1xlO-kg°2.9xl07ᑣḄN"O᳛P=.R3=2500KWᵫ9TU1V=ḄW▭O᳛400KW2YZᦔ᳛”\ஹ100%=16%9.2019•ᐰ_•`abc᝞9ᡠe2ᡃghi□k᯿m2ᙢᳫpi□Ḅq#ᕜsT,hᙢᳫk᯿m2ᨴᳫpᙢᳫḄq#ᕜsT,ᑣ0uvwᨴᳫ-ᙢᳫ-i□᣸ᑡᡂ{|ᩩ~Ḅ஺ᙢᳫpi□Ḅ⍝ᙠ2ᨴᳫpᙢᳫḄ⍝6%>>2hi□k᯿m2ᨴᳫq#2=ḄᨬᨬᜧḄᜧூ?ᫀ௃T'-T]T^rM+T2rEூB᪆௃ூDB௃

7পᙢᳫpi□Ḅ=஺/,ᨴᳫpᙢᳫḄ=஺/,/aFᳫ᣸ᡂ{|ᩩ~,ᑣCOj-CD't=2ᐔB_2%_24_TT2]-9-[2]1ᨴᳫq¢ᑮaᳫᙠᩩ~¤ᨴᳫᙠ¥2=ᨬ¦1ᨴᳫq¢ᑮaᳫᙠᩩ~§2¨ᙢᳫᙠ¥2=ᨬᜧ2ᦑᨵ஻-஻஻4/4g)4/2“min-%4ᙢj.2J-24±2(7+%),4±24´=%/=j+"ᦑᨵ¶4=·T«max4/+:24±ᓃ·TY¼½42ᡠhᨵᡠh=Y.=¿À4Á4/+/472-4/74±7¦\+7¦\TT·ᔩÃஹWÄ⚪10.2020•ᐰ_•`abcWÄ⚪ᓫ᤮ÈÉ<Ê=ËÉÌÍᳫᩞᧇḄᵯÐ᳛ூWÄ⚪Ñ௃᪷ÓÔᑡÕ<ḄWÄᘤᩞᑁ×2Øᓫ᤮WÄ2É<1ᙢḄÊ=ËÉÌÍᳫᩞᧇḄᵯÐ᳛஺ூWÄᘤᩞ௃1.ᓫ᤮ÙÚᝅÜᒹÞF90cmḄÉá2/-5.5஺~+5.5஺2ᑖ0.1஺஺2.å᤮ḄæᳫFK/=11.346gஹᵯÐ᳛b=3.767xl0?S/m¦å᤮ḄËÉÌÍᳫFK/m=35.112g஺3.íîÉïᘤðஹᔁòF2óô⍝Øõ⊤F÷ᵨùÈDú”õ⊤÷ᵨûüý”஺4.þÿ
ᙽ஺᧕ᱥᵨᣵᙢ☢஺5.⊤!ஹ#$%&ᙽ'ᡫ)*+ᵨ,-.஺6.0ឋ23!஺ூ567⚗௃

8(1).᤮ᳫḄ@ABCDEFGHIᵨJKL᤮A஺(2).᤮ᳫN@AᵨOPᔠᵨFGHIRKLSTSURVWXYḄᳫAᑖ[HI\ᣚ᤮ᳫ஺(3).H_ᙠ᤮Aabᘤdefg᪗i஺(4).ᵨk
lmnSUopqrstuv56DE஺(5).56wxyz{bᘤ|ᜓ᦮ᳮ᝱஺(6).56FGᐰG.⚣fgូqr56bᘤaH{0ᡷ15ᑖ஺(7).DEFGᡚ23ḄDEwᨵst஺ூẠ௃(1).Aឋ!¡¢mᳫ£ᙠ᪷C¥ḄAdCA¦E§m,mᳫ¦EmᳫḄ¨©§m,CAḄ¥ªl«¬+o®¯°ᓫ᤮஺ᶍ³Ḅ´Joµ᤮AḄ¶¥E·᤮¸Bml(m,a,5஺)+o¹ᓫ᤮Ḅº°»¼஺B¥l½¾¿ᓫ᤮ḄºÀÁÂÃᓫ᤮Ḅ᤮ÄÅḼl½⊦ÈÉ°Jᙠʯᵨ஺mᳫ᤮Ḅ˪Ìml.JÍÎN᤮˪ᡂAឋᐵÑmᳫḄºÒAឋÓḄºÔG஺+2/8+ᡂ஺=0,·ᨵÛÜ஺=6Ýᵨ8Þ&+9)ᐸ0᤮¸᜛Ñᦪg廼Ḅæᨵ¸⚣᳛஺AឋḄ¸⚣᳛஺N»¼Ḅ¸⚣᳛è½éêজ஺(2).º¡¢ᳫᙠëªìíᑮḄJëªìᢣḄ°½ðᓄ᳛(ëª)HòḄì஺¡¢ᳫᙠÉ᪵ḄìºlÁᙠᐸᑁõö÷øùᵯû«Áíᑮ᜜ìḄ¯ᵨ஺É!¯ᵨý°N¡¢ᳫḄºÔᔣÿ
஺ᳫᙠᑮḄᳫḄᵯ᳛ᨵᐵ஺᝞ᳫᙠ!G(%ᦪ)Ḅ
()⊤+ᡂ-F=^G2r5v,ᐸᔆ0ᳫḄ12
vᳫḄ4
஺ᳫᩞᧇḄᵯ᳛஺ூ89ᑁ;<⌕>௃89ᑁ;-জ.BᵨDᳫEᓫ᤮᤮ᳫ
HIJKLMḄNO4g஺(1)⌱Sᔠ〉ḄJKVᐹ
XYJKDᳫḄZ2dஹᓫ᤮᤮]ḄL4
ᑡ`89ᦪa
>`bᙳd
efgᔜᱥᳮKḄkIl஺(2)nfᔠᳮḄ89oᫀ
qJDᳫᙠ]ឋstuᵨv
᤮wxyḄzᓄ
|}89ᦪa
fgᕜT;᪷a]ឋoḄ
ᔠfgstᦪᑖ
ᑖgὅḄkIl஺(3)᪷aJK
ᑭᵨᕜḄfgNO4g,egᐸkIl஺ঝ.JlDᳫᙠuᵨvEᓫ᤮Ḅᦪ஺(1)ᙠ᤮ᳫ☟
ᙠ᤮ᳫḄvo2.5cm-3.0cmᜐ
qJDᳫᙠuᵨv
᤮wxyḄzᓄ
|}89ᦪa஺

9(2)᪷a89ᦪaᔠfg`§ᩩ©vᓫ᤮Ḅᦪ
egᐸkIl஺ঞ.JK«JᳫᩞᧇḄᵯ᳛(1)⌱Sᔠ〉Ḅ᤮L
ᑖᙠᨵஹ¬ᩩ©v
qJ«Jᳫᓫ᤮᤮wxyḄzᓄ
e|}89ᦪa஺(2)᪷a®JKᑖfg`¯°ᳫᙠᨵஹ¬Ḅᦪ±²᜛4
eg´!ᦪḄkIl஺(3)᪷a®89JK)<-F=^G2r5v,¹`«Jᳫᩞᧇᵯ᳛Ḅfg
᪷a89ᦪa>`«JᳫᩞᧇḄᵯ᳛஺
egᐸkIl஺89⌕>-(1).º»¼±½¾᦮JÀÁ(1290cm)ᑮᔠ〉ḄÃĽ89ᦪaḄJK஺(2).ᑏ`89ÆᳮஹÇu⌕È
ᑡ`89ᦪa
᪷a89ᑁ;ÉᶇË⌕ḄᦪaᜐᳮÌ஺ூÍᫀ௃Î᪆ூ᪆௃ூÐ௃Ñᑖ᪗H1.BᵨDᳫEᓫ᤮᤮ᳫ
HIJKÓᙢḄNO4gপ8ᑖ89Çu⌕È-1ᑖজ×DᳫEØÀ(ØÙ5஺)᤮
Ó᤮ᳫ᤮ᑮᨬÛÈ
BᵨXÜ⍝fᘤ|}᤮ᳫ᤮30YḄᡠᨵḄy30T஺ঝDᳫàá᤮ÀᜧÙ5°ä
Ó᤮ᳫÀ+ᑮ5°åæ|}89ᦪa஺89ᦪa|}çèJéᘤêÈëì-d=0.002mm0Yᦪ123456bᙳ30Ty(S)59.0359.159.0759.0659.0859.0359.06᤮]4(mm)950.1950.2950.0949.9949.8950.0950.0DᳫZ2420.00220.00019.99920.00419.99819.99820.000(mm)89ᦪaᜐᳮ᪷agðbᙳdḄkIl8=ñ:"ô2>ᔜJKᱥᳮKḄkIlö:yn(n-l)

10÷=0.014søSr=0.1mm.A
Sj=0.001mmøI2ùú5ûü+þÿ0
mm/=/+-=96.00cm12ᑣ᤮/=96.00±0.01
cmᑖ1⌕1ᑖᔜᓰ0.5ᑖ2
ᦪ6ᑖᕜஹ᤮ஹᳫᔜᓰ2ᑖ஺6"#$ᦪ6ᑖ3-5"%3ᑖ&'3"%1.5ᑖ(ᨵ*+,-ᘤḄ012ᡷ1ᑖ஺ᦪᡈ567ᓫ9ᡷ1ᑖ:ᨵᜐᨵᦔᦪ=>?@ᡷ1ᑖ:ABCᜐᨵᦔᦪ=┯1ᑣᦪEᑖ%0ᑖ3
>@FGḄ%H1ᑖ%H567ᓫ9ᡷ1ᑖ஺Iᨵ56:7JKḄᦪᡈὅᦪM56>NᐵḄ%0ᑖ஺2
8ᑖᦪPᜐᳮRᳫᙠTUVWᵨY:᤮Z[\]Ḅ^ᓄᦪᕜᦪ\]`S
aG`°aG`°aG`°aG`°aG`°00.005.005.005.005.005.001019.674.664.674.664.684.672039.344.344.354.334.364.333059.034.034.054.044.054.034078.713.783.793.793.793.785098.413.573.563.553.563.5760118.133.333.333.343.353.3370137.793.143.153.143.163.1480157.422.982.992.992.992.9890177.202.782.812.792.822.78100196.842.662.672.652.682.66110216.572.492.512.502.512.49

11120236.232.382.392.392.42.38130255.952.242.252.252.252.24140275.652.142.132.132.132.14150295.312.002.012.012.012.00160314.971.931.931.921.931.93170334.691.821.831.821.821.8218()354.301.741.731.741.741.74190374.031.661.651.651.651.66200393.801.591.581.591.591.59210413.411.501.501.511.501.50VWqᦪrs2ᑖtuv"ᦪwᔠyᵨz{஺=8d}~wᔠᑮVWqᦪᱏ᝞Y:Rᳫ12345ᙳwᔠ(S-')0.0041160.0040240.0040880.0040010.0041230.004070>@FGX==2.46x10-5s-iY5(5-1)=(4.07±0.03)x105tuᓫ"ᦪwᔠyᵨz{ln6=ln%-"wᔠ#ᑮVWqᦪ=0.002878-1!"#$“&'=4ஹ10*/?,=(2.87±0.04)x1(s-ᑖ1)ᦪ6ᑖ"#$ᦪᓫ"ᦪᜧ''11ᦪ%6ᑖ:&'3"ᦪᡈὅᓫ"Iᨵ8-10ᦪ%3ᑖ:ᓫ"ᦪ&'8ᦪ%0ᑖ஺ᦪᡈ567ᓫ9ᡷ1ᑖ:ᨵᜐᨵᦔᦪ=>?@ᡷ1ᑖ:ABCᜐᨵᦔᦪ=┯1ᑣᦪEᑖ%஺ᑖ(v"ᦪឋwᔠᑖ᪗¢£)

12ᡈὅᓫ"ᦪ,¤aG⊦¦¨ᜧ'3Gᓫ"ᦪᜧ''11ᦪ%6ᑖ:ᓫ"ᦪ,¤aG⊦¦aG¨ᙠ2-3Gᡈὅᓫ"Iᨵ8-10ᦪ%3ᑖ:ᓫ"ᦪ&'8ᦪ%0ᑖ஺ᦪᡈ567ᓫ9ᡷ1ᑖ:ᨵᜐᨵᦔᦪ=>?@ᡷ1ᑖ:ABCᜐᨵᦔᦪ=┯1ᑣᦪEᑖ%஺ᑖ2wᔠ©VWqᦪ4wᔠ©"#$VWqᦪ4ஹr©ᙳª%H©>@FG%2ᑖ:&'"wᔠ56Ḅ¦«%ᑖᡈὅ¬ᓫ"ᦪ,¤⌕rwᔠ©VWqᦪ®%H©ᐸ>@FG%2ᑖ:%H567ᓫ9ᡷ1ᑖ஺Iᨵ56:7JKḄᦪᡈὅᦪM56>NᐵḄ%0ᑖ஺
3r°®±²G᪷஺=´=ᔣ¶·=¸g0=
¹+᜛᪷,¤P%H56:¼ᦪª½ᐭz{=9.7782m/sᵫ>@FGÀ⌴z{,=ÂÃ+`ÄÅ+Æ=0.001`ᡈὅ%=g0x*=0.01m/s2g=
9.78±O.Olm/s2oᑖ1°®±²GḄz{1ᑖ2562ᑖ°®®Ç²G9.78m/s-9.80m/s`È>@FGḄ562ᑖ9.69m/s-9.77m/sᡈὅ9.81m/s-9.89m/s`È>@FGḄ561ᑖ;567ᓫ9ᡷ1ᑖ%HBÊ7>@FGḄrsz{ᡷ1ᑖ஺Iᨵ56:7JKḄᦪᡈὅᦪM56>NᐵḄ%0ᑖ஺2.,FRᳫᙠËVWᵨYÌᓫ᤮ÍÎḄVWqᦪ஺
17ᑖ⌕1ᑖজ>ᦋ^ÑÒRᳫÌᓫ᤮ÍÎḄᩩÔ:ÕRᳫ☟×\:¼ØÙÚtÛËÙÜÝ'RᳫÞß?Yt2.5cm-3.0cmᜐ஺ঝ¼Rᳫáâ᤮aᜧ'5஺\ãÜ:y᤮ᳫ?äåËÙḄ?æß᤮B:ç᤮ᳫaGèᑮ5஺\éêᦪ஺ᦪ6ᑖRᳫᙠTUVWPËVWḄᵨY:᤮Z[\]Ḅ^ᓄᦪ

13ᕜᦪ\]`SaG`°:ëaG`°aG`°aG`°aG`°00.005.0()5.005.005.005.0059.834.584.604.584.584.601019.684.184.194.194.184.181529.523.793.823.813.823.812039.363.493.483.493.483.492549.163.113.143.103.123.103058.972.792.812.802.812.803568.882.492.512.492.52.494078.712.112.122.112.122.114588.481.951.981.961.981.955098.351,701.721.701.721.7055108.231.491.501.501.501.49ᑖ1⌕1ᑖ2ᦪ6ᑖ"#$ᦪᓫ"ᦪᜧ''11ᦪ%6ᑖ:&'3"ᦪᡈὅᓫ"Iᨵ8-10ᦪ%3ᑖ:ᓫ"ᦪ&'8ᦪ%0ᑖ஺ᦪᡈ567ᓫ9ᡷ1ᑖ:ᨵᜐᨵᦔᦪ=>?@ᡷ1ᑖ:ABCᜐᨵᦔᦪ=┯1ᑣᦪEᑖ%0ᑖᡈὅᓫ"ᦪ,¤aG⊦¦¨ᜧ'3Gᓫ"ᦪᜧ''11ᦪ%6ᑖ:ᓫ"ᦪ,¤aG⊦¦aG¨ᙠ2-3Gᡈὅᓫ"Iᨵ8-10ᦪ%3ᑖ:ᓫ"ᦪ&'8ᦪ%0ᑖ஺ᦪᡈ567ᓫ9ᡷIᑖ:ᨵᜐᨵᦔᦪ=>?@ᡷ1ᑖ:ABCᜐᨵᦔᦪ=┯1ᑣᦪEᑖ%0ᑖ஺`2VWqᦪrs2ᑖtuv"ᦪwᔠíᳮyᵨz{"}~wᔠ:RᳫᙠËîæ᤮ÎḄËVVWqᦪমRᳫ12345ᙳwᔠMð"0.0062070.006()480.0062240.0061450.0062020.006165

14>@FGs=JZkl`ôPL=3xl`r'sT%\5`5-1A=
6.165±0.03X10-3S-1tuᓫ"ᦪwᔠyᵨz{In஺=In4-"wᔠ#ᑮVWqᦪ^,=0.01118-'>@FGû,=ᨴ=3:1஺ý2Vn-2/?,=`1.11+0.03x10-2s-1ᑖwᔠ©"#$VWqᦪÿ
ᙳ
Ḅ
Ḅ2ᑖᔠᡈὅ
!ᑖ"ᡈὅ#$ᓫ&'ᦪ)*+⌕ᔠ
-./ᦪ0
Ḅ
Ḅ2ᑖ1ᓫ2ᡷ1ᑖ56ᨵ&'18Ḅ&'ᦪ)ᡈὅ&'ᦪ)9ᐵḄ;ᑖ஺ᔠ
ᩭḄ>-?ᵨAḄ-./ᦪ⌕ᜧC-?ᵨAḄ-./ᦪDE8ᑣᔠG;ᑖ஺3.*K*LMᳫᩞᧇḄᵯR᳛஺T1U12ᑖV?⌕W"2.0ᑖজZA[ᳫ\ᢝ>^2_`஺ঝbK*LMᳫᢞde᦮᤮hḄijk᤮hḄi9l[ᳫ᤮himnTᳫoᑮ>^qr9[ᳫmnU஺ঞbK*LMᳫtu᤮vᜧ5஺xyzjk᤮ᳫ{|}>^Ḅ{~oḄ☢᤮᤮ᳫvᑮ5°xG&'ᦪ)TGK*LMᳫᙠ>~᤮x᤮vxḄ⊦U஺টK*LMᳫᙠ>~᤮Ḅᦪ)Gb>^ZA᪵bK*LMᳫtu᤮vᜧ5஺xyz᤮ᳫvᑮ5஺xG&'ᦪ)TGK*LMᳫᙠC~᤮x᤮vxḄ⊦U஺&'ᦪ)"10ᑖK*LMᳫᙠ>-.C-.?ᵨA᤮xḄ`ᓄᦪ)ᕜᦪxTSUvT°UvT°UvT°UvT°UvT°U00.005.005.005.005.005.002039.384.634.634.634.634.634078.774.304.294.294.284.2860118.133.983.983.983.973.96

1580157.513.663.653.653.673.67100196.943.383.393.393.383.38120236.233.103.113.103.093.10140275.662.872.862.872.892.89160315.062.622.612.622.592.59180354.452.402.392.382.392.40200393.842.192.192.192.192.19220433.231.991.991.991.991.99K*LMᳫᙠC-.?ᵨA᤮xḄ`ᓄᦪ)ᕜᦪx(S)v(°)00.005.003059.104.6560118.274.3190177.314.02120236.423.76150295.553.51180354.663.30210413.703.10240472.812.93270531.882.79300591.032.61330650.142.48360709.302.32390768.372.20420827.452.09450886.511.98

16K*LMᳫ¥&'ᦪ)G¦§*¨ᘤ;Wª«"4U=0.002mm®ᦪ123456ᙳK*LMᳫ¥20.00220.00119.99920.00319.99819.99820.000¯ᑖ"1UV?⌕W2ᑖ"2UK*LMᳫᙠ>-.C-.ᐳ?ᵨAḄ&'ᦪ)6ᑖ"±²d&'ᦪ)³ᓫ&'ᦪ)ᜧ´11µᦪ)W6ᑖ3ᦪ)ᡈὅᓫ6ᨵ8-10µᦪ)W3ᑖᓫᦪ)8µᦪ)W஺ᑖ஺&'ᦪ)ᡈ1ᓫ2ᡷ1ᑖᨵmᜐᨵᦔᦪ¹{ᡷ1ᑖº»ᜐᨵᦔᦪ¹┯ªᑣᦪ)½ᑖ0ᑖ5Thឋᔠ¿ᦪ)¯ᑖ᪗ÁmnUᡈὅᓫ&'ᦪ)*+v⊦Ãᜧ3³ᓫ&'ᦪ)ᜧ´11µᦪ)W6ᑖᓫ±&'ᦪ)*+v⊦vÃᙠ2-3ᡈὅᓫ6ᨵ8-10µᦪ)W3ᑖᓫᦪ)8µᦪ)W0ᑖ஺&'ᦪ)ᡈ1ᓫ2ᡷ1ᑖᨵmᜐᨵᦔᦪ¹{ᡷIᑖº»ᜐᨵᦔᦪ¹┯ªᑣᦪ)½ᑖ0ᑖ53UK*LMᳫᙠC-.?ᵨAḄ&'ᦪ)3ᑖ"ᓫ&'ᦪ)*+v⊦ÃᜧÅ3³ᓫ&'ᦪ)ᜧ´11µᦪ)W3ᑖᓫ±&'ᦪ)*+v⊦vÃᙠ2-3ᡈὅᓫ6ᨵ8-10µᦪ)W1.5ᑖᓫᦪ)8µᦪ)W0ᑖ஺&'ᦪ)ᡈ1ᓫ2ᡷ1ᑖᨵmᜐᨵᦔᦪ¹{ᡷ1ᑖº»ᜐᨵᦔᦪ¹┯ªᑣᦪ)½ᑖ0ᑖ"ᡈὅÆÇᙠ᤮iஹᳫḄ¥ஹ᤮ḄÉÊA»ᳫḄC-.-./ᦪmnyᐸlÌ&'ᦪ)½ᑖ3ᑖ54UK*LMᳫ¥ᦪ)1ᑖ"6²dᦪ)1ᑖ560.5ᑖ5Íᨵ¦§*¨ᘤḄ;Wª«ᡷ0.5ᑖ஺&'ᦪ)ᡈ1ᓫ2ᡷ1ᑖᨵmᜐᨵᦔᦪ¹{ᡷ1ᑖº»ᜐᨵᦔᦪ¹┯ªᑣᦪ)½ᑖ0ᑖ5ফ2ᑖK*LMᳫᙠC-.>--.?ᵨAḄ-./ᦪ"1.5ᑖÏÐm"¿&'ᦪ)ᔠjᵨ6=஺ÑᑠᔠÓk
K*LMᳫᙠ>--./ᦪÔÕÖLMᳫ12345ᙳᔠᵨk'U0.0015570.0015550.0015510.0015620.0015610.001557"6=ZU")=1.9x103/Ú5(5-1)

17/?=(1.557±0.019)x1()3-'3SÏÐÞ"ᓫ&'ᦪ)ᔠjᵨln=In4-"ᔠÓ²kᑮ-./ᦪ"/7,=0.00212s-1*4^=2x103æ=(2.12±0.02)xl0m3s-K*LMᳫC-./ᦪ0.5ᑖÏÐm"ᢣᦪᔠkè=0001506ST:S=1.3xl0^s-'Pi᜛4=(L506±().()()13)x1(ìs-ÏÐÞ"hឋᔠkᵨ=().()()l()3sT!"#$0%_4x10^s-1=1V஻m2ম=(1.03±0.014)x10+¯ᑖ"2ᑖ1)ᔠ
K*LMᳫḄ>--./ᦪ᜛3ᑭᵨ
L5ᑖ5ᔠ
ᦪ)±²dḄ-./ᦪ
ᙳᑭᵨ
1.5ᑖ3ᡈὅ11ᑖ5ᡈὅ#$ᓫ&'ᦪ)*+⌕Ḅᔠ
-./ᦪᱏᑭᵨ
1.5ᑖ51ᡷ1ᑖ52)ᔠ
K*LMᳫḄC-./ᦪᵨ0.5ᑖ1ᡷ15ᡠᨵḄ1ᓫ2ᡷ1ᑖ6ᨵ&'18Ḅ&'ᦪ)ᡈὅ&'ᦪ)9ᐵḄ;ᑖ஺ᔠ
ᩭḄ>-?ᵨAḄ-./ᦪ⌕ᜧC-?ᵨAḄ-./ᦪ[ᳫḄ-.ᜧᩩ÷AḄøᳫḄ-.DE8ᑣᔠG;ᑖ஺(3)R
ᵯR᳛Ḅ&'ᜐᳮᵯR᳛ḄúRÌ0-û"ì=9+"5F=K9=Kl*Kvdtdtᡠ²“=ì_9=(K_KC"þÌ0%=G2"5=2m/3K:.=%(=K2ᓃ=3'⁐42ẚ4K[—K—P\,n2

185=46᜛2-m24-ᐸ6ஹ%!"#$ᳫ&'ᳫḄᵯ*᳛,ಗஹᔩ!"#$ᳫ&'ᳫḄ/0,ஹ!"#$ᳫ&'ᳫḄ12஺4567ᜐᳮ:;<0=ᐭ?@A!"#$ᳫḄᵯ*᳛BCD=2.86x10%/mKLMNCO+ᵨ=6x10+4/)=S+T=7xl0P%ᓉYZ[70.05=5⇟]-AJ(⁐-6J`IbCc=().()5xd=0.14X106S/mᦑ5=(2.86±0.14)x10<,S/mkᑖCI)ᵯ*᳛?m*10ᑖCF=K*Kl*Kvஹnop=(K—K)rK=2m0ᔜ2ᑖ8=^2)!"#$ᳫᵯ*᳛676ᑖ:2xl06~2xl07S/m65),:IxlO6~2xl()6s/mᡈὅ2x107~3xl()7s/m3ᑖᐸy67z0ᑖ4567{ᓫ}ᡷ2ᑖᨵ4567,{Ḅ45ᦪᡈὅ45ᦪp67KᐵḄzᑖ஺3)4567ḄKLMNᑖ᪆2ᑖ஺{KLMNz?ᡷ1ᑖ஺ஹA⚪11.(2019ᐰ)᝞ᡠ,ᙠஹḄᢙ¡¢£,¤¥ᙠ¦¤§,¤§N¨=500.0஻?,«¬A®¯᪗.Aᑮ¤¥²¤§³2(´µMN)ᙠ¸¹☢¦Ḅᢗ¼(´µMN')Ḅ¾¿4=4000//7,A«¬ÀÁNv=2000,"/s(1)⌕ÄAŬᙳÇᙠ¤¥Ḅ²¤§³2MN¦,ÈÉAḄʵp¹☢MNMATḄÌÍÎÏÐÑ᪵ḄÓµ,M0@Ô(2)᝞7¤¥ᙠ¾AᨬÖḄ8ᜐ®YA,×Mᙠ¨=500.0,”Ḅ¹☢ᐜÚᙊᕜÝÞßàáâ&¤¥ÁNãḄäÀåÇA.%|=2OO.O஻7/S.ç@¤¥èᙊᕜÝÞ12ᜧê

19

20Rarcsinë᦮íîê4=vcos/?-/=L'5ï¬À,ᨵðvsin?.“g1=/?2-gh+^gh-v2)2-g2+h2)vᵫ¦òóôBᓃ=õöêḄg÷øzB4=16.61s,r=15.145,r=1.03545ᵫ4p+஻,«¬ùᙠ¤¥úäÀûᡭᤥ12.2019ᐰýêᳫAஹBஹ9ᙠᐝÿḄ
☢☟AஹBBஹB'B8ᨵᜐᵫ!"#᝱%A&'Bᒴ)*+ឋ-./Ḽ1234ᑮAஹ86ᳫ89:⍗-<=>?A8Ḅ@A/.DEF3GᨵᦔᦪAJABB'OvWWWM©/////Zzzz//zz/zzzzz/z/z/oூLᫀ௃7=4.60ூO᪆௃ூQO௃R3ஹ3'ḄSTUAVW7XYRAḄZ)"ST%,4ஹ8-/AḄ)"^_8Ḅ)"%2ᵫ`☢Ḅabcdefy/nv=ymv+mv,0AH12121o/-I2/OgkR%/Rhy—1y—1ᢥklGḄ“n-.opᱏ஺s/AḄ*+2⊤uTᓃwA%1V-/3ஹஹ"yz{஺R|ᒴ)*+)"T}=%=—■%.2y+18ᐭnaᔣ&஺ḄZ)"TYv=v-v=-vBfic0Ḅ"yᦪT&8ᑮcḄ"yᦪVW&'=-2%,8&C|+ᨵ

21&
☢XnaᔣḄ*+VWopஹB⍗s-Ḅᩩ=WD=/&J^&J=%&J⚗/6a6◀᦮ᳮ/gᐭঝgtan77wi=77=,7T

22T஻Ḅᳫê.
ஹᯠë!#᝱ì᝞kᵬᡠÑ.ðñᑮòGoḄ!"WóôõDäöᕡḼmg?kL,øùᑁûḄüýþÿ
ᐸூ௃ᵫ
ᳫ▭ᵫ.Ḅ!"#$Ḅᦪ&'$ᙠ)*+,-.ᶍ01.ᙠ2᪵Ḅ456ᳫᙠ789:;<=>ᔣᙳABC.ᵫ
DᳫEEFGH#0,IᑮKLᢞNO6>78CEPQR5ᕜT.U:;>ᔣḄVWXᙢZᡂ!ᕜTᑮKLᢞNO6>Ḅ8⊝^_`abbᜧ
Ḅ$#d.4kDᳫḄV,-ᵨ>fᩭhijᙠ᝞lmᡠoḄᙶ᪗r+DᳫᙠNx,y
ᜐḄ>f#t=-k'w+y2_J2+mgᙠDᳫḄTḄy$LWDḄz,.ᶍ01.{|>☢~yjx2+y2?LḄ$,-.ᶍDᳫḄ>f,-Aᓄ#ma=-kx9ma=-ky+mg.xx2<=>fijḄᕜTWUḄABC8⊝^_ᑖ#X>ᔣḄ$N9y>ᔣᙶ᪗##=Ḅ^k_.ὃ⇋CḄᩩᨵ

23x
t=Lcosry'0-1-cosDᳫ^
LᢞNO6>M=0,y=%=y☢Ḅ|Ḅ.K~ᯠDᳫᨬ,-ᑮKு=Ḅ^_.KூN௃2|=8☢CrḄ¡¢£I¤Ḅ8⊝^_┯^Ḅ¦I¤§¨ᙠ©ªᙢ«¬Ḅᔠᡂ®CḄ¯°ᵨḄ±Ạ³´.µ{|>☢¶·⚪¹ᯠº»¼½|=±·Ḅ¡¾⚪¿Zᐰ,-ᙠÁ¡Ḅ±ẠÂÃ|Ä▬ÃḄ᪀-ÂÃdz¢KᑮὃÈÉzḄÊḄ.14.2019•ᐰÌ•ÍÎÏÐ᝞lᡠoᨵ|ÑÒÓÔÕḄᐝ×DØÙ#M,Gᙠᐝ×78☢0ὃ⇋ÚÛÙ஺ÝzÃH#g஺ß|=ÙNà=᝞lG_᝱ÙN9DØâ☟äᯠ)ᵫFG஺Dᳫ6åræ)³ᐭèé#rḄᙊëQRᙊìí#஺=î)ïð|ñ`a/)ាPWÔDØôᑗö³ᐭÓ÷ᙊëᨬᓣᑮÓ÷y᝱WUÍḄN஺'1¦¼ÙNEùïðDØḄHᜧD'2#½ûüÙNាP³ᐭÓ÷ᙊë/X~#ýþ஺mூÿᫀ௃1,2-lgrফ/=20+lrூ᪆௃ூ௃1Ꮇᳫᙠᙢ☢ᨵ"#$%V,'($%V,)ᨵ"#$%Uᵫ"#+ᔣ)ᳫ-./0ឤ2mv+Mu—0xᑡ4ᙠῃ678Ḅ:/0ឤ12121^2—mvH--mv+—Mir=mgr\1H■--xy$%=>ᩩ@ᓃB“=b⚪FG4H=IᙠJBKLJMKNOPQR◀M,TḄUK+VWXUK$%YZ[2/\]

24♦=J(0_l)gr஻=J2(&7)gr%=J(0+l)gr(2)ᙠ)\ᳫaW=.=J(0+l)grḄbc$%\ᙠῃ6defgh.\ᐸjVᓽZ/\ᑡ4+Vglᐭ]/=2(+l)r15.(2019•ᐰp•qUrs)Bt/Zu\vwZ஺Ḅf☢yzᙠᐝ|"#☢}\~Bt/ZHஹZRḄᙳᒴᙊf☢|.\᝞ᡠ(1)f☢LᙊḄ.+V\ᢣ4ᙊY.Ḅh.ᩩ@(2)-Ḅ0ᓋ/\G4ᐹḄ⊤N(3)f☢Ḅ$%\aᙊt¡¢£f☢Ḅ$%ூ¤ᫀ௃পᓽ;஻Ma=FR,ᙊY.Ḅᩩ@Zq=Ra(2)Ma+m(a-acos0)=O(3)rsin2஺2(M+Msin஺]f☢$%LᙊtCḄ¡¢$%ᑖ¨Za=a"ag,%=©'«¬20\g3A/+(l+2sm0)m3M+(l+2sm0)mூ᪆௃ூ௃⌱®ᙢ☢Z¯ὃ\.¯ὃx'O'y'ᙠf☢}\᝞ᡠ.f☢ᨵᔣQḄ$%஺\ᙊtCᨵ¡¢£f☢Ḅ$%Z(ᐸ+ᔣf☢ᔣ)\aᙊtCZ.²\f☢Z.\ᵫ$%ᔠᡂᳮ%=%+"\¸¹=%<+%\ᦑᨵ£¼\]ᑮ¹;L/cosO-a,a=asin9.Cyr

25¢f☢¾ᵨth.ᳮ\ᨵMa=y^F=Fsing0-Fcos0.জxN¢ᙊt²\ᐸh.Àᑖ+VZm[~acx)=£ᓃ=Fcos0-FsinO,N+(-%.)=>,=-mg+FCOS+Fsin.Nὃ⇋ᑮ=MC0s6-a,a=asin/9.£¼\ᨵCyrFNsin8-Fcos6=m(%,cos8-a),ঝFcos0+FsinO-mg=-masin0.(3)NrᙊÃ.Ḅw$%Za(஺Z⌮Å┐Ã\᪷È./Éᳮ\ᨵJa=Y,M(F),ᓽg஻?R%=FR.টccᙊY.Ḅᩩ@Zq=.ঠ(2)f☢ᨵᔣQḄ$%v,ᙊtC¡¢£f☢ᨵᔣËḄ$%5\᝞ᡠ\᪷È$%ᔠᡂᳮ\ᨵ¹=Ì+»\¸¹=%*+%>\ᦑᨵ%<+%=5+y.£¼\]ᑮ%=qcos6>-v,V,=vsin9.oraf☢LᙊÎᡂ-\Ï-"#+ᔣ}ÐÑ᜜\ᵫ-"#+ᔣ}./0ឤ\I]Mv-m(vcos^-v)=0.rÓÔ¢Å8fÕ\ὃ⇋ᑮ=”,=%\ᓽ]dtdrMa+tn^a-acos^)=0.ডr(3)ὶNজÚড\]f☢$%LᙊtCḄ¡¢$%ᑖ¨Z77?sin202(M+m)sin஺a=-----------------------—oa=---------------L----------n3A/+(l+2sin2^)z?7'r3A/+(l+2sin216.(2019•ᐰp•qUrs)Ó¡ÛÜᔠÝÞ\ßÕàḄáâãäåæAஹ8ᙳIç"#è᥅êÃ.\¸ᵫ~BKëARèìí|æC}ᨵîï\ᢞBñᱥ\t/ZM,AஹBஹCḄᑖ¨Zó,RBR,t/ᑖ¨Z\ô\HB\\&\ßÓè஺1ஹ48öᨵᵯø\ᜧZR.ᐸúᵯøᙳÐû\ü8CᑖýᨵᒴþÿB,ᜧB,ᔣᚖ:

26

272MR0+("7+m)R+mR1Hcᨬᨵt\+4°H+!2MgMgR0_%(4+%)2MR*+(%+/)/?*+-8n0!ḄᳫᙠᜋSᜐḄyz☢%3-ᔣ|yzᳫeyz☢᥅ᦪ஻?eᜋḄ¡ឋḄ.:XXXXXBX\XXXXXx:☢X**XXXXX1!⌕ᳫ¥¦ᑮz☢%?ᨬ¨%ᚖᜋ☢Ḅ3eᜋ©%ᦪª«¬Ḅᩩ¯.2!ᳫ°%ᑮz☢%±?S1!xᡠ¬ᩩ¯Ḅ²³_?ᵫᳫᑮ☟¶ᵨ6.ᳫᨬ¸ᙠ¹ᜐº3!»ᳫ¼½yz☢?ᨬ☟¶¾8¿Àᑣ^8¿ᑮ☟¶ὑ6ÃĺK%V஻Kgz஺2ᐔmg(3)Ò=4+2=ூÆᫀ௃1!ÉE᪆2!5'=----------+஺B2q-"gூE᪆௃ூÓE௃1!»⌕ᳫ°%ᑮz☢%ᑣ✌ᐜᨵÖ4ᩭᡃÙÚ%ᑖEᡂᓃ-ᐸx%=[ᑣ\=%-ᓃ=%-Ý.ÞᳫḄᑖEᡂyzᔣ|Ḅ34Ḅßl3᳛ᓃḄ⌮6┐ᔣḄᒴ3ᙊᕜḄᔠᡂ?᧕[ᙊᕜxᨵBqç27mco=—,1mBq

28

29ᦑᵫ⚪ë¨íîᡠᵨ6w/=/஺-/=ïV=-._ðñ6wᑁᨵòᢝôN,?¬N=mg+3qv.^_f=஻N=஻ùg+v,ᑮᳫ¸¶6/Òú1=£f_1=+Z"ḄḄ="mgt'+pBqS'.f1ᐸxS'ᓽᳫ¨ᡠᨵüᵫýᳮᑣ-=".ᦑ_F=s=ÿῶ+./jBqB-q1èᳮ/¬1ᩩ2*es=gg+h.pBqB-q-3!ᵫ⚪ë,Bqvn

30(1)᝞RᡠSḄᙶ᪗s_ᙠTU☢ᑁ£q⍝¤¥k᥅|¦.§ᵨk☟¨ᑣs_ªᨵ«o¬ឋF,,,®¯°¬ឋF…s_zkq±nᙊᕜ³´ᵨµᯠᙶ᪗s_zk·ᑖ¸nMA<=ZE=3ὡ<º=mঞ»=",=&-஽-½v2,m—=R,-mco~R-2mcovটRNᵫÀট&ÂF=Ã(+2CDVR+O)2R2)=-(v+(y/?)2ঠNR'RÇÀঠÈᐭÀঞ&Â⁐=_஻ÍÎÏᔆডrRdv//.ÇÀডᑖ«Ót&ÂÔÕÖ=3×ØR(%+GR)ÚÛÜᑖᓄÞÂu=——1--CORঢ(2)ÇÀঢÈᐭÀঠÂá1â᜜=,”/?[(""R)]ণR+æI+3/?)ᓽnq⍝s_Ḅvw.ব᪷êVìÂ%/í”Ḅ¸3তdtdtR+"(%+GR)ÀতÚÛÜᑖ`ὃ⇋ñᩩf=0ᨵ5=0.òᨵ19.(2019•ᐰL•MNOP)ᨵ3móbᐝWôõöeᙠstM=10%Ḅøᜧùúû.3ü&ýþḄô

31ÿ
ᙠᩚ⚔ᙠᝅᙠᩚḄᩚᵫᩚᶍᜧZJ.ᙠ!"#$%ᐝ'Ḅ(")!*⊝᝱-(☠ᙠ.012(34*☢ᜳ45஺ᔣḄ9:;=ᡈ?.ᙠ᦮ABCDEᜐ4*☢ᑁHIJK.LM(ᓣABC!ODE4*Hᙢ☢QDEḄ☟᥅TUᦪWXY!ZX[ூ]ᫀ௃=0.103ூ`᪆௃ூb`௃ᵫ3ᩚc᥅TdᵫefḄgᵨ3(ijkl3ᩚᚖn.᝞pᡠrsᩚ!xt#!u#ᚖnvᔣ!ytwᙶ᪗U(z{Y|}~஻----------A2yjx2+y2+y=L^BPy=———ᦑ(z{!ᱥj⚔#!0,4!#᳛ws-MᳫsVᵫ6ᜐ*x=vtWᙢ☢,.12y=h--gty=஻-;22஻=.ᨵ"ᨴᓃ=ᑣ#x,yᨵt=±,v=-g-gVV9:vᔣA:=—=-4rX=--vvL

322τdᵫ=£,$¡=g£/•=/1+¨©ᨵ=ª«+
1**ᜐᨵ=-Hp—LL®¯k°=£p=x/2L,vḄvᔣ¶·z⍝ᑗjX=77,JTjᔠF=mgi_7j_-ᨵ=r2«+y■7^7¿ὃ⇋Âᙶ᪗x,y©kᨵg/w?=Å/wM+mgL-x©X2஻XT2/ὃ⇋DEḄÈfN=Mg+K7=Mg+ᔩy/73+3yg2
321+£2©1+/

33.fব"+3᜛’N(43+3ᵨ᜛+Ô0+᜛2)2!ᨬᜧØ/'(4)=0,ᨵg(6)=11Û+76஻+39Ý2—30=0ßàáᜧâØ!0.64g(£“Jᵨᑗjãᨵä=å.æg'(ᨴ1)èᜧᶍp.ᵫpéê£=஺6438ᜐ஻Ý©!᩽ᜧØᡠs4"ভð=0103mhi20.2019•ᐰò•óôõ©ᙠö÷øù□ḄûᙊCýa-r=oecosE,\—dt=T,ᐸᕜ஺e᳛.ᙠᜩᦻE!"#$%&'T=E-esinE.()*+ᜐ-./07=0,ᓽf=056'789ᙊḄ<=>ᚖ@A9ᙊB᜜DᙊḄᑮFḄ@GHᡠᡂᜳ.ᙠ9ᙊḄLᦪ%&x=acos5=bsin6Lᦪ6ᓽூUᫀ௃!XYZ᪆ூZ᪆௃ூ\Z௃...,,,j,-1/n\GMmGMm%]1'ᵫ`arᐵef(ᡝ2+l᜛5———=>——e,2"2GMGMᑣr+r0-=----------জraᵫA|■᝞df=T,ᑣx=y(17\Jr2ᐔᵫAr=,1஻ᐸᑣᔆ=ᜐ£).1+ecosO1+ecos஺ᵫAa—/*=aecosE,ijr=^(l-ecosE),ঝncosE-ecos8=--------l-ecos£

34i.md஺Td£T[l-e?dEnᑣk)=—=--------=------------dt2ndEdT2ᐔecosEdT_dr_rdrdE'"dr_2KdEdT•YGMT21+ecosEᐭঝf(/siYE+l-e?'\dT,)4ᐔ2a3jecosEr24ᐔ2ᑣdE-1ᵫ"#$f=aGM'dr1-ecosEᑖ^T=E-esinE+C.ᵫAᜐA/T=0,/21MaU-cosEQf=0,ᑣC=0,1+e'07ᓽ:¢£¤¥%]2'¦§᝞¨ᡠ©Ḅᙶ᪗eᑣ¬⍝%&®/,b=\l\-e2a»OC=c=ea.¯A<=>P(x,y5,ᨵr=CP=a-ex,Tfija-r=aecosE,ᑣx=acosE.²³஺ᙊ³஺´Ḅᙊ%&µ2+5/=".8¶²·*GBᙊAPᑣNPOC=E,T={—dt=~t.s¹º.ᑮ<=pḄ/¼ᐸ¼½8¾஻ᙌᑣ%%☢ÃÄVS=—,ᐵÅ7ÆÇ6ÈᵫA¯A®᪵ḄX,9ᙊஹᙊ¯ÏḄÐᙶ᪗Ñஹ)᧕ÓMÌᑣÍ=Jydx='J%dx=-S,ᑣS=-Sy"/.2PDAQPaJaJaa

35Ô0P=S஻DA0×-5^P"DAQ'P=3.-5஻c°sE♦asinE,SPDAQP=^PCAQP+S"oc=SPCAQP+](e"-"cosE)."sinE.1ᑣ2ÛtreesEasinEJ=SPCAO/,+y(e-cosE)aZ>sinE,22ᑣSPCAQP=gE-esinE),ᑣl=஻r+S"c3r="r+y(f-sinE)nab2ᐔ'ᑣT-E+2m-esinE.☢àáEâ0¾[0,2ᐔ5Ḅ>äåᦑâ◤èélEḄêëᓽᓄ7=E-esinE.21.2019•ᐰî•ïðñ5(15òaMḄᜩó(ô᝞õ□5÷øùòaúḄò(ô᝞£*+5³ÃÄ%ஹṨüý6ºµþÿᜐ
ᙠMḄᨵᵨ⍝☠"
ᨬ஻.!"1ᡠ%Ḅᦣ'(஺*ᓽ,ᔣḄ./(஺0.*20ᵯ3஺40Ḅ6ᵯ78*9᝞;<=᪶0?@
73ABஹᵯ3A44஺Ḅ6ᵯ78*9᝞᝞aF=0GHIJஹṨLMNOPQᜐ*ᡈSTᜐ0☠஺
ᙠUVḄᵨ஺,!"2ᡠ%Ḅᦣ'(0.ூY᪆௃ூ\Y௃*10᝞"ᡠ%
Ḅ]3^A஺ஹbஹc,a78Mbcᑁᯖ8
Ḅ⚔8஺gᙶ᪗<8jM஺
78஻ᙠ஺ᜐḄHIᜧl^Am.ᵫo3pឤᨵᵯr=:jᱏ,2c-a2ᵫ(3pឤᨵᑭ%*c-40=mvb,a

36ᡠG
6=2arccot——.GMᵫo3pឤᨵBz{|}ᵫ(3pឤᨵ஻%>(c+a)=mvp[Y°=k⌳ᵫᐵᨵcot^=tan<^=-=-^^-.2akqQᡠG
0=2arccot------kqQ22.2019•ᐰ•0᝞"ᡠ%
⍩Ḅᨵz
AR,73A஻
ᑖᙳᒴ.ᨵzᙠMᳫ”Ḅᙊ⍝¢£P¤¥.¦ὃ⇋Oᔣ©'¤
◤⌕®¤ḄḼ▮±⚪

37H*10³´µ¶·¸¹Ḽ▮,ᫀ
,ᫀz»¤j¼©'½HIᢣᔣᳫ
ᜧlAW.,ᫀÀ»¤©'½j¼HIᢣᔣḄÁ,ᔣ
ᜧlAᓃ
ÃᑖÄ!¶ᓃgᓃḄᜧl*20Åᑮ"%bǽ©'¤
AȤoÉÊḼ▮ᙠ"ḄA8
!¤©'½Ḅj¼ḄHI.*G¢±⚪ᙳ@ὃ⇋ḄÁÌᵨ
a¤ÍÎᑗ,ᔣḼ▮
¤ÍÎÐÑ⁚ḕÔᧇḄ©',Ö0ூ×ᫀ௃*10ᡠG
ᓃ=['■-.,2=\-J*20j¼HI”Ḅ,ᔣᢣᔣᳫ஺
VRHVn\HWᓝhᜧlAÝz10ᵨூY᪆௃ூ\Y௃*10Þ73Aß0
¤¥HIAJ.ᵫàáâÀãäåæ=ç
ᡠG
.H2H°VH¼c,ᫀz
ᵫ(3pឤ¤Ḽ▮èéḄHIw'=ëJ.A^4-n-L^AP^i-zH1,2GMm1212GMmᵫßóoôឤõ“ᱏ----=-7nv+-fnv-,0}2A22HᡠG
7ù-1k+269/£|ᗎ-1៫.ᫀᵫE—ஹ-/-=-┛2aZnn+K2᝞ᡠ஺1᩽!"#᩽ᙶ᪗.

38'(Ḅ+,-0=p.nI+ecosd.᜛=90஺0ᨵ0=᜛="..9=0஺0ᨵ;?=±-.1+eHHRHo----------------------=-----------------------ᡠ,e=Lᡠ1cos^R+H-R"+dp_HRH-Rsin0ᡠd[/?+//-/?
cos61]27zxl®8R+//—Rcos᜛]Rᡠ,஺=90஺0.tana=^=p-------\——L=—dpHRH-Rsin9H-RtanaRᡠJ*an%:;"জ1H-Rcosa=.—=]Vl+tan2aJ4-W+R2-'(=>0?@ABC@A஻Ḽ▮0@AGᵫHIJKឤᨵinvsinaH=mv'R.ঝ-CM.23.2019•ᐰP•QRST᪷VWXᜧᰦ[\]^_᦮a\]bcdḄ.ᙠfaᱯhḄ0i\]jCk•ḄlmḄC⌨o@Ap=Hr.qrb℉tḄuvhwᐸj”z0{Ḅ|ᦪᙠ~Ḅ0{ᑁHឤJ1\]Ḅcdᵫᵨ:@ḼMḄ\]ᙳA\]bḄᓽ▲c

39dbᔠḄᓽᙠf~0iᦈ¡ql¢£¤\]ᙳAḄᑖ¦mP,ᵨ”§¨©ᱥᳮ¬J⊤2'®¯\]Ḅuv¬J஻஺ᙳA>஻±²\]³ᜧᰦ[ᑮᦈḄ0{ᵨµ%,4¸¨©ᱥᳮ¬JḄ¹º⊤3H2+T4>/37i2Gp0ூÂᫀ௃প஺;:ফ'ÇÈwூÊ᪆௃ூÌÊ௃1ᙠÍ{jÎ~ÏmA\]jÑAÒὃÔᑣ§AkÖ×ᜐḄÏᐗÚ*ᐸÜÝÞßlGMAm1oæτ-4E=------+—AAm/T/FV2,ᐸjM=~ᐔ/3஺r23é᜛=2.0ᵫ⚪ëᨵ£=0,ᦑ~4Ḅ•3.+142r2=03r2ᡠ'2ᵫᦑÏᐗÚÝᙠ³A=¡ᑮï1ᜐðÜÝÞñGM'Am1.__oôE=-------+-2<0r2°³:éöᑮA,¹jAjÑ÷×ḄᳫᡠᒹµḄÏJJ'ᑭᵨüýþRhwᡃ
᩽Ḅᙊᙊ஻:GMAnGM'Am1------=--------+—bAmrHr2஺22ar2ᙠᓽ"#qḄ%&'Am)AḄ*+.-.ὃ⇋123ᙠ4567894ᐔG&>?@Dᦑ2rO7lCr/9—3/700T24TT2ᵫMNOPQRSJ=74nWXᕜḄ%Z',a3GM'.\]8/ᐔ2GA8ᐔG_3"aᡝTT/%/஺cᵫd⚪8ᡠg5,ᑣ,]ᔆ83kl24.2019•ᐰo•pQqr'stᙠu8vw#஻=200m/syz{sX|}~⚣᳛%=2000HzḄ|AsBᜐ%ᵨ14s,ᙢ☢-ὅᜐὅEstᙠAᑮB678⚣᳛ᵫᓃ=2400Hz%=1600Hz.wv=330m/s,gstsXp#.

40ூᫀ௃/?=1.034xl03mூ¡᪆௃ூ£¡௃¤stᙠAᜐ%¥ᑮḄ¦4ᜐ}~Ḅstᙠ8ᜐ%¥ᑮḄ¦3'ᜐ}~Ḅ§ᜐstsXḄ¨ᔣ)ὅZḄᜳ«ᑖaஹ4᝞°ᡠ±.ᵫ²NOᦔ´µvVᓃ=77^¶’¸ᐭᦪ»¡cosa=0.2750,cos/=0.4125.ᡠvsine=0.9614,sin/?=0.9109,cota=0.2860,cot/?=0.4528¦A¼ᑮEᵨ%½¾½=-----.vsina¦&¼ᑮEᵨ%½vsinpᵫ°8ḄÀÁᐵÃ(AF-A'A)+Ä+HB)=AB,(h\(hB|Jhcota-u--------+hcot/3-u----------=utIvsinaJ(vsin/?)¸ᐭᦪ»/2=1.034X1()3m.ூÆÇ௃ÈdÉᡈὅ'ḄWË)Ḅ¼ÌᙠÍ-Ḅ²NOᦔ´ᡃÏÐᨵᐵÒÓ)¥ÔZḄÕÉᡈὅ'ḄWË)Ḅ¼Ì>ᙠÍ-%ὅ¥ᑮ¦%ÓᑮÉḄ¨ÖÏ×%¥ᑮḄ¦¼ÌḄ¨ÖØÔZḄÕÙ᩽᧕ÛÜᶍÞß~┯25.2019•ᐰo•pQqr'᝞°ᵬᡠ±ᙠz{ᐝãä☢Ḅ8åᨵᐝãæç0,᪷é#ÃᦪkḄêëḄìឋîï6æç஺îḄñRdæçòó¨ḄAÆôÃõöᵬ"Ḅæᳫìឋî_ᵫ#ød¨.ùæᳫúä☢ûü3ᜐ¤ý=/,Ïùæᳫúᚖd08Ḅ¨ᔣvÿ
%☢

41

42
2ᳫᑮCxᔣḄyᔣḄ
.ᵫxyᔣ!"#ᔜ%&ឤ()CḄ
*&ஹᙶ᪗”ᑖ128Ḅᙶ᪗3=/ஹ
%‘=%ὶ89ᩭᨵ<=k=>?@AᳫXஹyᔣḄBᑖ14='5=/,XஹyᔣḄCx=A,cos@f,y=Asincot.yᳫDḄE⍝Gᙊ:26.2019•ᐰL•MNOPQ@RᳫSTURVWḄ%ᯠYZḄ[\]ឋ_]ឋ_Ḅ`abcd9ᩭefU᪷]ឋ_bh@ᩩjklm᝞oᡠqQ.rᙠtᳫᙠᚖjh]ឋ_vwjkᔣᔣlxy1cm,ᯠz{|z}ᳫḄᕜ2s.xy2cmᳫḄᕜm]ឋ_%ᯠZ
/஺1cm,Qூᫀ௃4=ூ<᪆௃ூ<௃ᳫᚖjh]ᡠᜐḄvwjkm=4Q])ᵫ4YZ/ᑣ______I7y/2\2/==ᵨ1+ᜩ஺+¢2]ḄYZ£/-/mQ=♦.x2¥᪷]ᵫ¦§Ḅ]k=k—.“0ᑣᳫᡠ¨ᑮḄᔠª=-2ᨴ5¬஽2-®/=-¯1Qkᳫ¨ᑮḄᔠᓽᳫḄ±²³´ᯠµkឋḄ.ᳫD¶·Ḅ¸C஻º=-^^=%'C½¾kឋC¿ÀᨵᦪÂ<Ãᨵ<᪆<ĵ¶hÅ⚪ᡃÈÉ◤<.

43Ë@£Ìᑖ᪆✌ᐜᡃÈᩭÏd@ÐᵫlѸCÒdḄᳫḄDᐸᕜᵫÔÕÖ×Òdi2CḄÙ'ᨵᐵÛii2ᳫḄBᨵᐵ.Ü[஻]=[N.mTâã?.m"],[A]=[m].ÖToeA'%,ᡠãs=(s7•m2)”•rap=s-2a.m_2

44yḄez{|}Ḅgh~⚪ᙠ☢ᨵ.fḄ⚪ᢈᑣᙠḄ☠ᢵNᑮHḄḄNeZḄ⊤{.27.2021•ᐰ•¡¢gh£6¥¦§ᙠ¨©ª«⌲®஺¯°6¥¦§dd±²³´᪀ᡂ·¸¹º஺ᯠ»¥¦§ᙳ¼½¾Ḅ
᳛v«Á☢Ḅ¦§Âᓽ¦§1«2ஹ2«3ஹ3«4ஹ4«5ஹ5«6ஹ6«1£,ᙠÇÈÉÊ¥¦§ḄËVᔣÍNᢣᔣᐸḄ¦§஺ÏÐÑᵨ0,³Ód¥¦§Ḅ±²/,᝞ÕᡠÖ஺~×ØÂ1£Ù3ѯ°ÚÈ#»☢Ḅ¦§«ᑮ☢Ḅ¦§AÂ2£Ùѯ°ÛÜ«©☢Ḅ¦§¥¦§ÚÝÞßàÉAÂ3£ᙠSÑ¥¦§Ḅâ
ᜧNß஺v2/ூ᪆௃ூᑖ᪆௃ூä௃ᵫåæឋ¥¦§ËVçèN᪵Ḅ¼¦§1êÂ1£ᙠÙ¦§1ᑮ¦§Ḅ2ëìᔣ©¦§1³å¦§2Ḅ
ᑖ$Vᓃ=v-vcos60°=—r2¦§1«©2Ḅ/21t=—=—ᓃvÂ2£Ùѯ°ÛÜ«©☢Ḅ¦§¥¦§ᡠÝḄàÉs=vt=21Â3£ó¦§IḄËVõö÷ᯠᙶ᪗úᐸᑗᔣâ
dvüa=—=0rrdt᝞⚪ÕᡠÖýᵫ¦§1ËVᑮ1'E¦§2ËVᑮþE¦§1Ḅ
ᔣ¾Ùÿᢣᔣ7Ḅd

45ᵫᳮJ=J-+(M/)2—24J஻COS120஺=^l-vdt^+(vt/r)2-2(/-v^r)vJzcosl20°={(J-ydfj+(ydf)2+(///0)rdஹ=J/2-2/y0+2(V0)+50/"0)2=y/l2-lvdt+(vdt)2,1,«/—vat2ᵫᳮJ_vdf_vdtsin120°sin(d஺)dO;<"A22'

46

47Ḅ⁚ᳮn¡¢Ḅ£ᦻᓄᱯ⁐.ea©ªnᐸ¬ᑖᜋ☢®ᵨḄ¯°£±²⛲Ḅ´¬µᜧ᯿ᱏ¸²⛲Z¹ºn»¼Ḅᐳ¾ᔾᦈ.£±Áᨵ/ÂᑡZ☢ÄஹᕜÆឋ᣸ᑡḄpuɯ°»¼Êᐭ¯°ÌÍί°<ḄÏÐÑÒÓÔ¾K.ᓫÖ¯°×£±ÌḄÏÐØÙÓᓄᡂ/ÖÛÜÝᐻᐳ¾ᘤ᝞ebᡠg.Ꮇ⯰ãᙳ1ஹᓫÖ¯°ÌḄÏÐῚÄᙳåஹ¯°æç☢ÄèS.»¼ᙠÏÐØ<éêÙëìíéêLᓃBÏÐð஺ñÄòឋóKḄᐵÂᓃ=ஹõᐸ<ö÷ÐøḄùOúBᐸÄVûüᓄDý”=-ÿ7=஽᪗7PAV/VAV7᝱(273K,lalm=L01xl()5pa)(!"#ᳮ%&)Ḅ᥅)*+Mn*29.0g/mol,345/67&8〉:+R=8.31J/(Kmol).ISL>a.?@ABᜋ᯿ᱏ(FG)>h?@ABHIJᓄ>LMNḄOPQᐻᐳTᘤVW(1)X᪗᝱ḄYZ[\]ᙠ_Ḅ`abZᓃ;(2)XefOPgᐻᐳTᘤᔾᦈ\]Ḅ⚣᳛(ᵨᓃஹSஹIஹVo⊤q);(3)#rᔾᦈ⚣᳛ᑖt#120Hz[200HzḄ\]wNḄxy?@z{☢}~5N#?ᓃூᫀ௃(1)331m/s(2)(3)0.362MMூ᪆௃ூ௃(1)ᵫᳮ%&᝱ᨵpV=-^—RT(1)_PஹV[Tᑖt#Ḅஹ&}[(M)ZM[“ᑖt#*+[᥅)*+.ᵫ(1)YZ#ᙠ᪗᝱(᪗“᪗”⊤q)ᨵc__29.0xl0-3kg/molxl.01xl05Pa_?஺᪗—£¤஺.£”“."2"——“Kg/mফRT᪗8.31J/(AT-mol)x273Kᳮ%&Ḅ3¦§¨2©=:+

48_ª«345.Mex¬?ᑖ\pVr+ypVr'\V=0(3)ᵫ(3)!Ḅ&}ឋV+#K=-V-^-=yp(4)AV\]ᙠ_Ḅ`abZ#ᙠ᪗᝱ᨵ3¯=331m/s3ম1.29kg/m(2)°±ᑁḄ³Ḅ*+#m=pSl(6)°±_Ḅ³Ḅ´µ«ᵫ᜜·¸¹4ᘤᑁḄ¸~ºᡠ¼½Ḅ.¾¿Gᑖ³´µḄÀÁ#Â(ᔣ᜜#Ä)4ᘤᑁḄ&}ḄᦋÆ#AV=Sc4ᘤᑁ&¸ḄÆᓄ§¨3¦ᵫ(3)ᨵ᝞=_Ö(8)VwNᙢMÈ°±ᑁ´µḼḄ³ḄÊᵨ¸#ypS2xF=5Ap=--------(9)VËÌ°±ᑁ³Ḅ´µ!ᑏ#…x=pSlx(10)(10)!ᑏᡂ2(11)X=-GJTX¿«JÏTµḄ஺«JÏTµḄᙊ⚣᳛(12)Ñᐭ(10)ᡠfOPgᐻᐳTᘤᔾᦈ\]Ḅ⚣᳛#2=Ó‘°2Ô2"(13)eᨬØ£Ùᑭᵨ/ᓫÜ?@ØḄῚ&&}#/=ᓃ.

49Þ3ßᢥ⚪¾xy◤⌕ä¦ᡠfOPgᐻᐳTᘤᔾᦈ\]Ḅ⚣᳛f[å~5#0l4=120Hz=0.60(14)ç£200HzᵫÞ13ß!_Si[S2«wNḄefOPgᐻᐳTᘤḄ?@Ḅz{☢}.ᵫÞ15ßᨵᓽ*ê36Þë30.2019•ᐰî•ïðñòßóᵨôBõḄJᓄVW᝞>஻ᡠqxõ÷Ḅøùᙳ#!ûᶍᑁ᜜øùºß*+ᙳ#ýõ÷þᩩḄ
ᶍ2mᐸḄᐝmḄ
ᶍ/ஹ
2mḄ
ា#$%Ḅ&'(ᩚḄᙳ2/ஹ
ᙳ஻?-./012ஹ345ᡂ78᦮:ஹ3ᔜ<Ḅ
ᑖ>?@ᙳᒴḄ.CDEFGᜧIg.1LḄM7NOPQRSᓱUVWX.YZ[\.]^_`$Oᵫ☟cdefghᙠ0`ᙢ☢lm.ḄnoḄpFG.2ᙠ0`ᙢ☢lm.ḄnoqᓽstᓱUḄNOuv]3┝xᙠlYḄnoqᓽy┝Ꮇ{lmvo|}[W~lY/ᙠ(ᔣW.0ᙢ☢ஹ0ᙢ☢oḄ᥅ᦪᙳ஻ᨬᜧ☟᥅D%᥅D.hᙠde(_☟cḄZḄ.ூᫀ௃15716(1+6j9¦-4/)(27஻Ḅ§-4/)2,(2)------F/78408980119/2-4,ூy᪆௃ூªy௃1M7NOᓱUVWX.YZ[\.Ḅ«

5021ফ)2=2(4=27m=E121246Ḅ«J,=-2mI2=—ml2-1260᦮:Ḅ«...4.2J=J+J——mlপi2⚪3᦮:Ḅ
$OᑮḄ(¯y⚪P”)2m—ফ2_rc=4{0ᙢ☢lm.ḄnoḄpFG஺ᵫ´µX¶ឤᨵy⚪PbJar=4mgh(3)ºh@3᦮:Ḅ
¼½Ḅ(¯y⚪Pb)hr2](2)º¿ᐭ&ºÁ,2rIrh----------—3/46ᵫ&º3(1)(3)ºÁভ(2)ᙠ0ᙢ☢lm.Ḅno3Ḅ
ḄFGᜧIᔊlÃ%=Å+•ᔆÈ

51ᵫÉÊᐵᨵ2ᩩc°s”জl.no3
FGḄ`0(ᑖ/Ñᔣ./ÒᑖÓ-Ã2r_rÃvv&-%,smÕ--6/ম43/9/2—4/yjgr(944ᡝ%“=%,cos®=7(6)3/12/Ûlmvoo◞Ý1,ᵫ⚪{ஹ0ÞᡂḄßᙠlm'78ᱥ:.álvᵫ%/0ᙢ☢oᨵâ1FG/0ᙢ☢oᙠlm`ᔣḄâãäᵨD@᥅D.{lmᙢ☢1ßᙠ(ᔣ&æḄçᢝDV,ᙠlmYḄnoßḄ`FG%%é.ᙠ`3(ᔣ&ᑖÓ1êßᵨëᳮᨵAr=0-(-4wv)clyíoAzJD=6mv-4mv0clx(8)oîÁïðḄ@8ºñ/ḄòWX%~óVíºñ/ḄòÅWX%~.ᵫíôºÁ6mv=4/7?v-jj^mv=4/nvsin<9-//477?vcos00CIxCXyclclᓽ22v=—(sin0-//cos^)v=—(sin0-//cos=(sin஺-4cos0CI2rý஻2tan®=☟ᦑ5=0972u?3NQ,@N஺,;CD@EFG(H=M-.ᑖIᙠKELᔣ@N$LᔣḄOᵨ3ᙢ☢=-.Ḅ0᥅R3SCD@EFOTUV᦮XḄ235⚪7dᡠ97:N;ᙢ☢=CDYZḄ>?3.

52

53஻\/=2mr/3(16)ᵫ(15)_`cx,1016N஺=2mg+N=2mg+—mg=—mg0V33aᵫ(16)_`2mr~2mr33rb-.cᔊeff◞t#h1ᵫh1ᩩjᨵ(or=ptr=v=v+at(17)0cmᓽ(᜛-r»=%ᵫm`%(sin஺-஻cos஺)IT>g-a0-.uh1eḄvwTv(=%+q/=(sin6>U஻cosU஻g(‘y';Ẇ=(sin0-//cos(18)ᙠ᦮V/0/1▤-HzḄ{|஺TᱏU~=2r;ᨵ2__-|2^^(sine-HCOs஺)-(sine_஻cos6)22»=-----=-------------------------------------------24-2஻g(▬U஻cos=^^(2U஻)▤n.-.h1▤-.Ḅ23᝞5⚪7eᡠ97:Ng;ᙢ☢=-.Ḅ>?3%2@%O2ᑖI;CD@EFG(H=-.ᙠKELᔣ@N$LᔣḄOᵨ3;ᙢ☢=-.ḄOᵨ3(☟᥅R3).CD@EFOTUUV᦮XḄ235⚪7/ᡠ97:M;ᙢ☢=CDYZḄ>?3.

545⚪7f=-.ᵨᳮᨵF2-NO2=2maC2(20)X=-.ᵨᳮᨵ-fr=2mr/i(21)22ᵫh1ᩩjᨵ%2=᜛2r(22)ᵫ(20)(21)(22)_`No*?=4maC2=CD@EFᙠKELᔣᵨᳮᨵN-/N?=4maOX2C2ὶ_ᨵ=CD@EFᙠN$LᔣᵨᳮᨵN=4mg-NOy22=CD@EFᵨ=(CḄKEHḄᳮᨵsind+M,cos0+N,sin6-N:cos஺=0Ox2Oy2ὶ_N@”,`OX2juN^-sin0+N^cos0+-2-^sin0-(4mg-N^COS6=022<25`;

5524(ll//tan0+lO)/n^OylߟߟIl஻tan6+12ߟa=஻g(23)8"ll^tan/9+12ᙠ᦮Vh1▤-HzḄ{|§¨©0-Vj2=2஻C2$2;-Vj2_(ll஻lan6+12)®$2(sin8-஻cos஺)2஻g33(sine-஻cose)2(ll஻tan6>+12)j13+6ᱥ-4/q)ᙠ-.¶$%☟Ḅ᦮V():-HzḄ{|TS=S]+s2·”஻^7¸+16g/6"9801஻g16"+6Ḅ/2-4/H2r-//V9Z2-4r2Jr5778408+-980179/2-4/~ফ31.2019•ᐰÁ•ÂÃÄ᝞7a,Å-ᨵUVÆÇTRḄÈᙊÊËÌTÍឋÏ᪀VÑÊÈḄZÒÓÔᙳKE᪀ᡂ×ØT஻ḄÙ×ÚÛÊÜÝᐸHḄGÒ.ÆÇT/•ḄUᙊßÛↈáₐãäᙠÊ☢ãå:ÝÊ☢:஺ÒᜐₐãçTᑴéêÊÜçᐸ:ãåçTᨬãá@ãåᔜíḄçᑖîï;ᙳᒴḄãÂT”§ãÂñãåòwËóᶍ.ã:õᨵₐKₐKöwTP.÷3øvwᜧêTg.

561TúûₐKãᡠõₐKüËýþÿᢝₐḄᨬ?2ₐḄ☢᠒!"ᑮ$ᙊ&Ḅᑁᑗ)஺+,☟.&☢ᨵ012■.ᱥ5!67&☢8&☢Ḅ1ᔜ:Ḅ;<ᑖ>?ᙳᒴḄBOOLACGHIJK,LMNᑁOPᔜ&QḄRᢝSTP)!"UₐV)&☢WᜐḄᦋZ.m'1+4££rW_1ফ'41prHy/3R-r14mpHூ]ᫀ௃11+--——mg1+--——mgpjir~5m3a5m3ajmூn᪆௃ூpn௃1q&☢W஺rᙶ᪗u+qv஺+ᔣxḄyz{ry}.ₐᒹₐᙠᑁḄ;WV,“r4mH(y=পCMI+?(m//?)"ₐḄ./mᡝ,পᓽ4mH,h2522~~-T7—tn+Ahᓃὃ⇋ᙠₐₐḄ☢⌲᠒xᓣḄvₐ᦮5Ḅ;Wᐜ⌲ᯠ⌲xᓣ.r¡¢ₐ£¤2¥Ḅₐ¦ᢝₐ᦮5Ḅ;W§¤2¥¨©&☢,ᜐ)ᨬ+ḄV.k%=%".ᦑᨵ%=0dh-ফᵫপফ³,m7”%x=1(3)5tn´µ¶·¸ᔠ⚪»ₐḄᨬr

57(4)ூ¼½¾n¿Àxὃ⇋ᙠₐₐḄ☢⌲᠒xᓣḄvₐ᦮5Ḅ;Wᐜ⌲ᯠ⌲xᓣ.r¡¢ₐ£¤2¥Ḅₐ¦ᢝₐ᦮5Ḅ;W§¤2¥¨©&☢ᜐ)ᨬ+ḄVy”S=ᖐJ=”.•1ᓽ2mHm2_____τ___=52/11I+S7I,CM-m+Ah2AAÇÈÉᦪ¸ËÌ஻È2mHm252Am+Ahm+2/1ᓽtn(4)pTir12*,ÎËÏДᓽₐḄᨬ.௃2Ñ&Ò;

58>=@tan30=:(6)226ÕQᙊ&ᜐ)S⊝å᝱yzçᔣᔠSrèN+N+N-Q-P=OABCN,=N(8)c஺=é+êT8,p=Mg.ᵫëì³qx}ríî}Sï⊝Q(R-r)+NffB-(N+N>)OlO"^0(9)BAcÑ*=R—ᔆᵫ(5)(6)(9)ᨵQR'+N,ஹ=0ூ௃qACríî}ᵫSï⊝ᩩóᨵQ(R'-OV;')+N(O;R-OVii)-POV0i=0(9)B஺(ôõö÷+õöøõ=oὶúqxᔜ³="2û’,+஻1.26ýøþÿ3"+M]+&(10)3aIaJ\5m3zz(a+eH')Q+aP(R-ryf_4/rprHgஹNA=*='---------J---------=1+J3——L1+--—m+M+£(H)3aya5m3ᢣḄ(10)N>>0,ᓽA4ஹ26(R_r)_af47rpHஹM>-------------------Jl+——------m(12)aV5mᵫ⚪ᩩ.ᵫ(7)(10)(11)ᑁ!"#ᔜ%&Ḅ'ᢝ)*#+ₐ-./01Ḅᦋ34(”-25)஺+஺8P+Q2y/3R-r:τ49pᡝHmg(13)33aN5nl(a+6R)O+aPP+Qy/3R-rL4:pr2HAJV4=A7VC1+-----------mg(14)33a5m32.(2019•ᐰ=•>?@A)BCDE44FGHI4G°=200N,JKLAMNḄ/OPQBCRSᙠ

59ᜋVJMNḄWXA3'ᥛᐸ]=3,a=30஺᝞cᡠe.fgᙠ/OhDEᱏḄLjVkKBᙌfgmnᵨH)G=500Nst/Ouᜋvwxy/OufvwḄ᥅{|ᦪ*~☟᥅{|ᦪ4஻,=0.3,N᥅{|ᦪ4஻=0.2.1᝞⌕HᱥGfXᙠ᜛=0Ḅ⌕sᜧ)82᝞⌕HᱥG᠒ᓣfXᙠ8=0◤ᵨᜧ483ᙠ¡¢ᓣHᱥᡠ◤Ḅ£)ᨬ¥ᐸ4ᜧூ§ᫀ௃পF=29.6N28=3293N3|ᙠ/O®¯MN1ᡠ◤Ḅᨬ£)4=583.8N¥ᙠ/O±ᐭ/Nv³ᨬ£)4´0=568.8Nூ᪆௃ூ¶௃1✌ᐜᑖ᪆/OKḼLAMN»ᜐ+½┝¿᝱.᝞/Oᜐ+½┝¿᝱ᑣBCÂÃᜧḄ᜜)Åᵨᙠ/OVᙠfXÆ/NḄÇÈ/OᢝÉ⊝.½┝/OÆÈË┐MNcÍ/OḄÎ)ᑖ᪆᪷ÐÉ⊝ᩩO*Zg=0,Fcosa-F=0জANZÔ=0,Fsma-F-G-G+F=0AosZM/F)=O,4ÖߟG)+M=Oট

60DGBG+G0
ὶÙজÚটJ7——r-------------0
ণឤᡂ.⌕G4F!"⌮┐%&'ᑮ)*.+⌕,-.:ᱥ123☠56ᙠ!"8Ḅ!&᪷;56Ḅ᥅=>?ᙠ5@A!&BCDEF=Ge""=500xea3x3,t=84517VFত56!&HᑣEb==500x002x3"=3293N
থ3
EK,ᓣ.ᱥ1ᨵF>G.+ᙠNOḄPQR᪷;S⊝ᩩVᨵு2ὡ=0ᐭcosa-[-Fsin#=0
Z\=0,^sina-FcosR-G0-G-6=0]=0,4R-@-*=0.ᙠ!"_ᨵ%&Ḅ`abᓽ/\rftanaJ.„ὶ
f
tana/g+sin஻-1-cos/?F)I”,r4஻J2
ஹEKᑖ᪆>klg᜛F=tana—+sin/?-cos/?rz

61PQEnopqr!"Ḅs┝᩽▲ᵫ+ᨵgᵨF=tana/g+sinᔣ-'-cos/7°=0I",r2ᵫ+

=44.5஺ᙠ஻ுᱏ`ab!"
{%&o,-.ᱥ|+◤⌕~!"%&ḄP⁐.+oὶথP⁐ᓽ£tan«'GIA.+1+GF=Gexp[஻,37T-F]tan஺+sinP-cosJ3GGMJ1஻ு!"%&o,-ᱥEK56CDFḄᨬ᪷;
g᜛F=8ᔳ@gg8s
…ὃ⇋ᑮ04᜛4ᐔa+᜛=ᐔgᑗᑮᨬᜧ.ᨵn=150஺|+ᙠ!"@A%&BE!"ᜋḄ☟᥅=Dᡠ◤ḄᨬCDE£=ggU-----------=583.8NFদtana———+sinp--L-cospmm44r2ᙠ!"¤ᐭ!&HE!&᥅=Dᡠ◤ḄᨬCDE¥☢
§¨©!"%&ª!"s┝,.ᱥᡠ◤ḄCD⌕!"s┝,ᓣ.ᱥ{3☠56ᙠ!"«¬8Ḅ!&ᩭ®¯.!"s┝56!&B56ḄCD᪷;থᨵF=Ge""=500xexp0.3+2=3853NF>583.8NF.!"s┝56!&H56CD᪷;
ᨵF=G*=500xexp0.2+2஺°=1950N
>568.8NF±ᯠদধ³ᡠ⌕ḄᨬCD33.2019•ᐰ¶•·¸¹ºFᙳ¼ᩚA8¾E2/,¿ÀᙢÂᙠÃ☢ÄÅ8BÆÃ☢ḄÄÅÇÈ.ÉgÊ᡾&ᩚÌÍ8Æᔣ᜜%&.ᩚ'ᑮÃÏḄÐDEÑᩚÌÒ@ÃÏÓÔ1
ᩚÒ@ÃÏᩚ%ÕḄPQo+ᩚḄPÖQ×2
᝞ÙᩚᚖÀᙢᡭÜᙢ☢ᑣÃÏḄ·QEÝÞ×

62ூàᫀ௃1
3=COஹ=\21ூ᪆௃ூã௃ᩚḄ'Dᑖ᪆᝞äᡠå.1
ᩚEẆçèéᙠᩚpÒ@ÃÏ
§ÌᩚḄê&ëìÍBḄ%&᪷;&{ᳮᨵ-0=/n^/l-cos0
.জᵫÍBÆ%&ᨵ4=ï"JÌᐸñᐭজò
?g"cose
JV2/¼£CḄóᔣôÖQEõ=BCᶭ=1a2.᪷;¼£ê&ᳮᨵmd'=^F=mgcos0-F,,mgcos0-F=mlco1,2
cltNN53ö=jmgcos6-jmg.533ᩚÒ@Ã☢ᨵn=0,ᓽ÷=øïgeos஺—øúg=0,B|Jcos^=j.3ᦑᩚÒ@ÃÏᩚ%ÕḄPQE஺=a=arccosg.+ᩚ%&ḄPÖQE2/2
ᩚῃÒÃÏý'.DìᵨᩚìS☢ê&᝞äᡠå.

63%BU᪷;ᩚè¼£Ḅ&þÿᳮᓽJCA=ZMC=0a=0,ᩚḄ.ᩚḄ==/஺|,"#ᨵ⌕&ᩚ'(ᙢᡭ+ᙢ☢ᐸ.Ḅ/01஺=஻ᐔ-4஻=1,2,3,....ᩚᙠ:;<=ᑮᡭ+ᙢ☢ᡠḄ@ABCgN3gᩚᙠEFGᔣḄIJ%=3+MN=3“+265"#<=ḄR/01஻=yc+/-/cos6]=j25/+24e+ফ34.2019•ᐰ]•R^_`ᡭ᫕bḄcᛞR“=40.0”?┴Ḅhi=L0xl04mnopqrs᫕Ḅhᔩ=2.0x10"᝖᫕Ḅwx☢yGzᐸ{|a=O.5஻7.᫕ᙠᡭᐭᙢḄ.ᐸ⌕ᩭ᫕☢sᐸḄᵨᦪ=2.5x10,N/᫕ᡭᐭᙢ=1஺.஺@┴ᓣR=ᯠᵫᡭ+᫕.Ꮇ¢£¤.#¥ᐰ¦§ឋ£¤©ª«ᑡ⚪¯1°±┴²᫕ᡭ³´µ2ᡭ᫕Ḅᦔ᳛ᵨ"¸¹᫕Ḅ²hM┴ᡭ+᫕Ḅ²hº»³¼µ

64(3)᝞À£¤.#§ឋ£¤ᐸឮÂᦪe=0.8,ÄÅᑖ᪆⚪(1)È(2).ூ«ᫀ௃প1=0.155Íফ7=33.3%(3)4=0228""=12%ூÎ᪆௃ூÏÎ௃(1)┴/?R@᪷ÑbÒ²ÓឤÕᐸv=y]2ghজ0ᵫ"#¦§ឋ£¤"᫕È┴ÖᡂḄØ᪷ÑhÓឤÕᨵÙ%=(i+⁐)Uঝὶ(ÞজMÞঝ£¤᫕È┴Ḅᐳáâ"4+%3¢°±┴²᫕ᡭᐭḄ´d,äåFᔣXçyᔣ᫕è@éᑮḄF=-kx4axট"᫕ஹ┴ØëᜫḄ²hᵨ"íîïðᨵñÞটóᐭÞঠᓄö4kad2+[8ka%—2GH+m)g~^d+/n,)v2=0i2óᐭᦪÿ5/+41.2d-6.5=04=0.155m(2),┴Ḅ"=ᱏ="|g஻#᫕ஹ┴&'ᵨ)*+,-./Ḅ7j=—(«?,+//J2)v2=—(«?1+m)gh.ণ229ᦑᡭ᫕ᦔ᳛7=J='1%<=33.3%.T09ml(3)?┴@᫕ABC┴ஹ᫕ḄDEᑖGᓃIᓃ᪷KLMឤOPᨵR%=ᓃ+Sy2ত2᪷KឮWXᦪḄOZᨵὶ\]ত@]থ_=%`("')bcd(e)f

65ᓽW=-O.2v,v=0.6%.
o2hᯠ#┴jkl.@]ঠnoᨵJpFdx=0-qᔩvq-mgd2.2ὶ\]টஹ]
I]tuᐭᦪw2.5x+30.46?,-7.056=0,a=O-228/nyz{`┴ᡭ|Ḅ}E0.228S~Cᡭ᫕Ḅᦔ᳛"@1=2x0.62=72%/2yᨵJ'lឋ#ᡭ᫕Ḅᦔ᳛{ᵫ)XIḄLᜫᦔ᳛.35.(2019ᐰ)ᡈᐝᳫ`Eᐭᑮ¡⊤☢¤¥¦Ḅk§¨©ᕈ«“k)ᐭ”Ḅ«¯.°±)`²³´Ḅ¡µ¶ᳫ·ᐸ@¡⊤☢¹º»MឤC¼ᙠk§¾¿Àᓾ⊤«ÂÃÄ᜻ÆḄ«¯{²³´ḄlឋÇ⌼¡µ¶ᳫÉÊËlឋᳫÌÉÊᳫ.{²Êᳫᙠ¡⊤☢¤Ḅk§ÍÎÏᐰlឋḄᵨ¼yÐÑᙢÓÔ³´ᱥḄlឋ«¯.Ö×ØÙÚIJÛ⚪pifMU`(al)(a2)(a3)(a4)Ý1)(b2)(b3)(b4)Þ1Þ2(I)ßà`áÊᳫâᙠ`áᜧÊᳫḄ⚔¤å{æáÊᳫ`çèᵫÙétêᙢ☢ë쥫Êᳫí§×ᑮîÀ᝞ðᜧÊᳫ@ÊᳫḄñòóô⌱ö〉·øùÊᳫàk§ḄEᜧúûᐜÙéEḄ9ý᝞Þ1ᡠÔ.ßàᜧÊᳫஹÊᳫIÿᳫᙠᵫ᝞2ᡠ᝞ᳫḄ⌱ាᙠᙢ☢"#ᳫ$%&Ḅ'()*+,ᐜ'(Ḅ49..0123456789:(2)᝞;ᳫ<=Ḅ>(?@ABCDEḄF>(GHᙢ☢DEḄ;ᳫᙠAஹBJKLMᩭO%&᝞3ᡠ.09:PQRSTḄᩩVூXᫀ௃(1)9:]^᪆(2)9:]^᪆ூ^᪆௃ூ`^௃(1)ᙠᜧ;ᳫᙢ☢LbJ;ᳫᙳᵫLMdPQᜧ;ᳫᐜGᙢ☢ef"

662ᓽGi;ᳫPQᎷkᜧ;ᳫGᙢ☢(ᵫwxyzឤ|}%=ᜧ;ᳫGᙢ☢pឋ">(ᜧiᔣᔣ.kᜧ;ᳫGi;ᳫpឋ"Ḅ>(ᜧiᑖV?ᔣᔣ.ᵫzឤ?wxyzឤ|}mv+MV=Mv-mv(){}^/nv24-^-MV2஻ᱏঝMᜧ;ᳫḄwi;ᳫḄᵫজGঝ|^}=,v=^~-vঞ¡M+mM+m"i;ᳫ<£>(v¤¥ᔣ¦ᵫwxyzឤ|}i;ᳫ%&Ḅ'(:u1ஹtngH=—tnv~টv2(3M-m}2ᓽ}~ᔁhঠ2g©⌱ᜧ;ᳫª«i;ᳫª«Ḅ10.ᓽR=10r,ᑣM=l¡3஻7.´+ᵫঠ}ᑮH=8.976h*9h·´⚪2ᡠḄ¹ºḄᳫkᵫ»¹ºᳫḄᑖ¼ஹ”?஻i¾¿᪷Áb☢Ḅᑖ᪆ᜧᳫÂGᙢ☢"2ᓽGᳫᔩPQᵫঞ|Äᳫᔩ(%&tiᳫ¼Å<>(%Æ⚪2-bl.ᙠe·ᳫᔩÈt☟ÊḄËឋÌÍiᳫ¼e·´ᳫÎ2<>(4%GᳫÏ2e⚪2-b2¡.ᵫ´Ð"ᳫ¼e·´ᳫᔩ<>(4%%&⚪23¡,ᓽiᳫÑe·´ᙢ☢<>(7%%&⚪2-b4¡.ÒÓiᳫ¼%&Ḅ'(”'H=Z2^L=49Ù=49/?ড2g2g2¡✌ᐜÝÞDE;ᳫᙠHᙢ☢Ḅß⚪.Ꮇk+nᐰpឋḄÈM;ᳫGᙢ☢àáKᜐãᨵe·äåæᑮ᥅è3Ḅéᵨëtìᶍî3Ḅïð.ÝÞñbḄ¦ò᝱ᵨ᪗“0”⊤÷ø"ᵨ“1”ஹ÷ùø"ᵨ“2”⊤úÓûü.

67ý;ᳫ¦ḄB☢xOyB☢᝞ᡠk;ᳫḄiª«R,ᙠ÷øb;ᳫþḄ>(%<ᓃ,஺V,.஺⊤Ḅᑖ▂ᳫḄzḄḄᑖ%!"#$%&'(ᜐḄ᥅+,£,.ᔣ,0ᵨ234.᪷7(Ḅ89ᳮ$ᙠX<ᔣᨵ”“ᓃ.0=-BCDঢ᪷78G9ᳮ$ḄzᨵHI-஺0=-J"Lণ2ᐸO$4ᳫḄZḄ8P$ᙳRᳫ$ᨵJc=W஻T2U᜜$Wឋ$Y᥅+,Z[\$ᵫ^_`aឤ9cdegm
fe+¥.o+Jcᡂ=^ᓃτ+তὃ⇋ᑮnᐰWឋ$dp᜜஺=-%஺থᵫrঢrণ$de“Rᓃj+k=H3-0°
sᵫrত$tᑭᵨrথvr
$eᑮᓃw+xR=-%>+yRzᙠ$⌕RzᙠAஹB(}3ᩭ$⌕TAஹBᜐḄ8᝱$YUᳫḄvᓃ=-%஺$=-0஺JC?rᐭr
O$eᑮᓃ஺=஺஺=24,mR52d$ᳫ$2஺=0஺Ḅᑖvᙢ☢$ᑣᳫ2ᓃj=ḄᑖI=-0஺svᙢ☢$¡᪵ᳫ£ᩭ36.2019•ᐰ¥•¦§¨©᝞«ᡠ$®☢ᑁᨵ°(஺8,O±ᨵ"²³0ḄWឋ´µ$WឋµḄ¶·ᦪ!,°஺($¹"ºᢞ"^ḄᳫB,☟½Bᜐ$¹ᨵ"᪵ḄWឋµ°஺($8ᳫ"᪵ḄᳫA·ᙠµḄ¹"º.zAᳫ¾¿$À஺4=/,஺(Áᜐᨵ"®Ḅ2WឋᜋM.ÃÄ2dÅAᐹᨵ®<ᔣḄ±ÀA`ÇOB,TV.µvµ}3ZÈÉÊ,Aᳫ°µZÈv8“”

68MAIBூÌ᪆௃ூÏÌ௃✌ᐜÒÓ᝞«ᡠḄᙶ᪗·.Ö⚪Ø$(AḄ⊝ÚÛᙠ3(.ZÜÝÞ$(Aᙠx<ᔣv><ᔣ±Ḅ8àáâãä8$Àᕜæ.%AḄ4$ᑣ⚣᳛ᨵx=cos(0f+%,)y=A,cos("+%J(1)ᵫ⚪Ødp$éf=0,v=02$ᨵXo=Ar=/,(p=0,y-A.-----y-,(p=7tOxaOyK&|Jx/cos",y=—"^cos(/f+ᐔ)êᯠ$éf2$ᨵx=0,y=0,ᓽAB($íᔠ⚪Ø4(2)1=0,uwO(<ᔣᔣð)2$ᐜòóAᙠx<ᔣ±Ḅ8ᙠôᜋ2Ḅ8õᯠáx=lcosa)t.öᜋḄ8õᯠáâãä8$2$ᐸ8v÷øÄ¿x=0ᜐ◤2=÷/=0¿ᜋúT)ᜐ◤2üý"þ=ÿ

69ᵫᩩAx=0ᜐḄ4=G4=42=%+2T*2=1+2G஺=4+2r=3r+4r212=2஺-1)(4+72)+஺=-^NZ(=1,2,3,L)%=(2/-l)(r+r)+r=ng(i=1,2,3,L)l22OVKᡠ/f=&+%±lᐔ2j=]2,3,L)567Aᙠy:ᔣḄ<=.ᵫy=A’cos(a)t+ᵨJv,.=coAsin(of+%)yvFf=0%=-G%>=vIᐭK-L=A,.cos%,v=0A,sin%.kk37.2019•ᐰO•PQRST᝞VᡠWXYZ[1,\]ᐰ^_ḄᙳaᐝcᙊᳫFfg᤮ijk\lm^ᑗikQYᳫAஹ8ஹCarᙳstuᙠᐝcvw☢kᳫ஺ḄariyQYᳫarz2.{ᑖ᪆~

70

71

72mkᳫḄaত<=ikᳫᑮ☟ikᳫᡂḄyQḄ=2cos®=g.থkᳫᑮ☢Ḅ஻=2sin(9=gjg.
ᵫণ
ῃkᳫ☢ᡠ◤Ḅ”2
.9£ᵫতikᳫᙠᑁ<=16(7146-5/38)52=V20=¡ᵫথ¢kᳫ£¤¥☢ikQYᳫḄaᡠ¦ᡂḄyQḄy§¨©]6ªᔊ+38¬ª…”^~-——L38.2019•ᐰO•PQRSTᨵ³´ᵫᐝcḄᩚ᪀ᡂ·t:᝞VᡠW¸u¹ᐝcḄộ»ᐸqC6஺,Ḅ½¾c6cḄ½A&ÀḄ½ᡝA4Ḅ½ᩚḄÂÃÄÅÆᙠǽtarMḄÈᱥ{ÊC1¥cËᜐ³ᢝÍḄᜧÏ.ª:Ð⊤Wᵨᔜ½ÓÔ⊤WmᜐḄ^ÕÖᵨÍTூØᫀ௃C=ÛÜ642ூÝ᪆௃ூÞÝ௃ᐜẆáAAஹ¸¥ஹ4ᕒQᩚḄãÍäå.ᨵম+¥+ᕒ=Ç.çA4,xl-Px^-A2x—=0,Aj=P+A.2

73ç4B?,4x1—4x—=0,^2+B?=A3.?ªéA383,ax1—Ax—=o,&+ë=A.ᔜὃ⇋îᔜ½zḄ§ïðᐵò.211ÝKA="/BfP,A,=—P,B.=—P,'14'14A,=-P,B.=-P.37-75Ẇá2õᩚḄãÍäåö¤ᨵCl-Cxl=O,C,+D,=C.|X2231Cxl-Bx--Cx-=O,C+D=B+C.2|322}3Cxl-Cx-=0,C+D=C.3433431-Cxl-Bx--Cx—=0,C4+N=û+C5.425Cxl-Cx-=0,C+D=C.5655631C+D=B+C.66}tᔜýὃ⇋îᔜ½zḄ§ïðᐵò.ÝKG=~p,6=rO4239.2019•ᐰO•PQRSTÿ
Ḅᳫᢥᵬᡠᚮᨵᳫᨵᳫ…஻ᨵWᳫ.Ḅᳫᢥᡠᑏᙶ᪗$",஻,P($ᐸ*”,஺ᑖ/⊤ᳫᙠ*Ḅ᣸ᦪ,4567ᦪᙠ8᣸Ḅ9ᦪ(.:;<=>$ᑭ,஻,஺(Ḅᳫ@A☢ᳫ$m+l,஻,p(ஹ$m+l,஻+l,p(ஹe/+L"+l,p+l(LMḄNOᳫPQ>Af(m.!.1)/<.(m.2Jyஹ/w.2.2)3.3)(U4/ᔳ2)(ᔩ44(2)B.ᵬ/

74Mo(¤஻P)=(¥P+1)=MgoN(“(m,n,p)=p^Mgூ_ᫀ௃oN()o([,p)=(஻+1ூb᪆௃ூdb௃Ẇfᳫ(஻7,஻,p)hA☢ᳫḄNOiᵨᑖ/k>(ᡂ«,/?)oᳫ(4+1,஻,p)@ᳫ(%”,p)MḄNOrN(m,n,p)oᳫ(%+l,zi+l,p)@ᳫ(zn,w,p)MḄNO;MN{m,n,p)oᳫ(a+I,஻+l,p+l)@ᳫMḄNO.m=>p)Ḅᳫz{hOᑖ᪆ᨵ[N(}஻,p)-G"T஻P)[+[](஻?,஻,p)-A%(ᑭ-1,1,p-1)]0nᔣᑖOhOᑖ᪆᝞Aᡠ.ᵫᔠO>0oNg(”,p)-N([1,n,p)=N(m,n,p)-p-i)0GOI=N(m,n,p)-N(m-],n-},p).ঝMl0ঝᐭজN(m,n,p)-p)m=N^m,n,p)-N{rn-\,n-\,p-\)mm=N(m,n,p)-N(m-\,n-l,p)=Mg=^-Mg.l0l03cosd6☢Ḅe=arcsinஹ5,ᳫ(p)Ḅᙶ᪗ᡠ•Ḅᳫ☢ᙠ¡N(M஻,p)=0,£᜜¥¦ᩩ¨>জ[=1¡N()o(l,஻,p)=◀Mg,

75ঝP=1¡=§Mg,6ঞP=஻¡Ngm,஻஻
=—Mg,6টM=஻z¡N¨,©p=Mg.0G6ᔠ®¥¦ᩩ¨⌴°Nm,n,p^n-p+\^—Mgl0o•N”m,n,p=p,Mg$U஻,p
=$m-஻+1
£ᔾ40.2019•ᐰ³•´µ¶(ᡠ·ᨩᱥPºᢣ¼½*¾¿ÀÁÂᐝÄÁÅᐝÆÇÈÉᑮḄᱥPÁËᨩᱥP@ÌÍᱥPÎ⍳ÐÑᨵÒOÓÔᜩᦻ×ØᨵÙÚ⊤ÛᨩᱥPḄPQÜᓰ¼½ÞPQḄ90%ß99%.᝞àÜᵨáâãäØᑮᨩᱥP4ÇzåØ<¼½*ᱥPḄÞᙳçè0,¾éᡃëìÜ᪷îA☢ï®Ḅðᳮ⚜ó¼½ôõḄö÷.¼½ḄôõÚºᙠ20øù30úᵫûüýþÿ
ḄᢣὅᙠḄ᝞O
ᔣᔣᑮᡠᨵᐸ"Ḅ᝞#$%ᙠ&'()ᐸ*+v,-'Rᡂ/0ᓽ2=HR,᝞56ᡠ60ᦪ஻9:;<=ᓫ?@ᓟB/DᐝF$.জ᝞IJ@ᙳᒴḄᔜᔣNឋḄᐸᱥQR+@஺TUQ=@VḄPᙠ&'ὅ஺WᡠXᑮḄᡠᨵᐸ"ᱥQᒹZ5bᳫ☢ᑁஹ᜜`aᑖ$cḄdefghiঝ᝞IQ=@஻ḄPkcl஺mḄefnop=-rᐸM@5ᳫ☢ᑁᱥQḄQ=$PḄdo=Eslᐸto,efnouvwxyា{E=0ḄᱥQR+᜛,=~.8/rGঞy0ᙠḄᱥQR+஺,R+஽Ḅᜧᓽ⚜ᡈ&ᡈᙠᩭḄW@ᦈ.ூᫀ௃@^RpGmঝxy£¤᪆ঞy£¤᪆ூ¤᪆௃ூ¦¤௃

764ஹA///174জ§¨@RḄᳫ☢ᑁᡠᨵᱥQḄQ=@M,c஺Ḅ©ᨵefª=G«=-7tRpGm.ᳫ᜜ḄᡠᨵᱥQw¬ᦪg®¯ᱥQ°Ḅdᔠ²R+ᙳᒴḄ®¯ᳫ°cᐸᑁḄQmḄef@³ᦑµᳫ☢᜜ᡠᨵᱥQcPḄeff¶=0.·ᔠw`aᑖ¸ᡠᨵᱥQcPḄdef4f=f^+f^=^RPGm-A4ঝ¹஻=º7*0,Ep=-]7»pG஻?w½PḄ¾@¿ᙢᳫ⊤☢ÂᱥÃḄ¾@ÄÅÆÇt14aA/2oÈᐰᓄ@efnoWdo=E=0,ᓽËÌÍR20Gm=0,Î=ᓺ?Ðᐭ¤Ò°="238©GঞÆA,஺WVÎ2-?©Õ2/V0,ᑣ%.ஹ©R20G=W£,¹MឤÙyPÚÛRÜᜧᙠÝ233R14*Þß-'RḄÜᜧà▲ᓽ&.Æ஺>2.W^m2-^R2pGm<0,ᑣVᨵ/?<ã=/?.c@ᐝ*$ᵫå¸.ß-æçᨬᜧéêᵨWìí@ᦈC.41.
2019•ᐰï•æºðñ$ᩚBCஹBDஹCDஹCEஹCGஹ£>Gᵫᐝóôõö?l/ÃḄ÷vcøùᔜᩚḄQ=úû᝞5ᡠ6.üô5ஹEýGþÙḄᙠÿ஺ᜐᨵ஺ᔣḄᵨP,ᙠCᜐᨵCGᔣḄᵨQ.ᙠ⊝᝱ᔜᩚḄᑁூᫀ௃SCE=RPScB=YiP0S=-y[2PS=-Q-^PCDcaூ᪆௃ூ௃!Ḅ"#஺$%☢'Ḅ()*"ᙳ#,!()*CE"#6a.ECᔣḄᓫ>ᔣ?1tcE=-*@+j+k-᪵Ḅஹ=*2"/5,7=]£2,—5•ᎷᔜᩚḄᑁᙳ#ABᵨ£⊤DEFḄᑁ.ᙠHCᜐ᝞JᡠDᨵ

77

78

79L=-A0|COS®/+?)ᑣ,#0v=-B(OCOS(ª«᩽ᙶ᪗0#᩽5'#᩽®c¯Ḅᑣ᝞JᡠD.஽p=asina|ae0,—,l)lij^p=acosaAO,x±?=aAsina=acosaAa,ᡠ±=±0

80³R%=%=0,ᡠa=e,ᓽ᜛=asin஻2¹᩽ᙶ᪗rᙊḄº5»xᙠx'Oy'FḄXYº#¼+y"=ᦑᙠX஺5FḄXYº#ᐔ»x᧕Á/==¯~a~2\k43.2019•ᐰÄ•ÅÆÇ5[%ᜧÉᘤFËᨵÌÍÎḄÏÐÑ!Ò`ḄÓtᑖÔ#8ÖA2Pi4
ᙠ?@AB
ᩈCᔣ8ḄEF:H8+qKLSgNᔣOḄPF.ᵫRSTUVWXY
ᐸ8ZḄ[\]>4=2Uᒹ.2Pi+0311ᵨf⊤-ᡠ◤Ḅij
ᑣ=l
ᵫm%n'p2.ᩈ895qᐭ8☢s
ᵨU⊤-ᩈᙠO☢BḄu]
?iᩈᡠCEFvw
x>gS+.KLSg,zPFw>ᨴZ/Sg+P2HL-
KSg,~=i
PFEFf~L'=0i
PFᜧEF
Xᨵ•ᔠF>Ḅ⊝.ᵨ"⊤-ᙠm⊝i
ᩈᙠO☢BḄu]
ᑣmiᨵ+P2KLSg=p&Sg+02HL—KSg,ᵫmXn"=L/2.ᓽᩈḄBᜐ;<=ᜐi
ᩈᜐ⊝᝱
ᙶ᪗
ᐸ<=☢O
ᔣ>z¢
ᔣO>£
ᑣ~ᩈBḄᙶ᪗z=Oi
ᩈᡠCᔠF>
~Bᙶ᪗>zi
ᡠCᔠF>

811¥®+PLSg+"l+Z§§g=PP\Sgz=_kz2¨B©=H22"JSg.?iᩈḄA>-%z=¥(p1+p^LSa>®ZᔣḄ[\]>CHᨴ282-27-------------gz=-CDZᡠ°"=2*ᵫmXY>²³´
ᐸᕜ¶>7=2=27CO2(0-¸,>¹ºᩈ»i.ᙠ;¼BḄij
ᐜº´Ḅ´¾A.ᩈ89Àqᐭ8☢i
ᐸ\]>V="lᵫÁÂÃÄឤXYg1(Z?,+P)ASV2+|ZZ2=1M2,2¨Bz=2L>miᩈBÆÇᙶ᪗ḄÇÈ.2ᵫOÉᔜ¨Xn4=ÆᵫmXY
2ᩈ895qᐭ8☢ᑮBÆᑮ:ᙶ᪗ᡠËḄÇÈÌ´¾ḄÍ
2Îὃᙊ(᝞Òᡠ-)OXY
ÔÕḄe>30஺
ÔÕḄij>U
Ømᩈ2895qᐭ8☢ᑮO9q12ᐭ8☢ᡠᵨḄij
ᓽBÆ2z=¥Lᑮz=-gLᡠᵨḄij>L஺JÙÚ|3.2ᩈᐰÝᐭ8☢5
CFÞßḄᑖ᪆N1Báâ
ãÌPFᜧEF
ᡠ°äᒴæ\
[\]Ḅᦪè©᪵
ᐸ@AN1BÞßêᙢÔì
ᡠᵨij4=4.Mr-ஹ16V6+yj27V4.îij>
=.++=----------6ூï௃ð⚪Ìò@AḄóô
ᐸBᒹõ¹vö᦮Ḅ³´@A.øvö᦮Ḅ³´@Aùᐭ

82ò@AḄúᩖB
?¼óôᙠᱥᳮþÿ
ᯠḄᔜᨵ᦮ḄᑖḄẆ!"#$%&'Ḅᓽ)*Ḅ+,-./ᩭ12ᐸ4+)*5ὃᙊᡈᐸ9:;ᩭ12Ḅ<=.44.2019•ᐰA•BCDEFGH4ḄIJKᵫM/NᦪPḄQRSᩭTᢝRS$81V-A4WXV-ᙢ☢4Wᱥᙽ8ḄIJ]%^_ᵫᙢ`ᙠGHbcᵨefᔣXḄhi=klmnRSoXpqᙠRឋ▲/ᑁF᝞vᡠxyᙠNz☟|<}~᜜hAஹ8Ḅὅᔜ_ᑮḄᨬᜧB/.pAஹ8=ᑣᐸRឋFூ᪆௃ூ௃}~᜜hAB&fᑮRS<AஹBḄ+X"F+21ng²2ᐔ2+4+2XAB=&7-=---7----mgKK*Aஹ8ḄG⊝+,¢£Ḅ5ὃ¤p

83+MÂÃ+2+4៣K1³JKᱥᙽ8Æᑮ-Aᑖ·ᜐᡠᵨḄ<=ᮞ=&]=2%Ê.gஹkᙠ4ஹBᑖ·ᜐRSËÌ/Ø2+1—1
Ð=12-2+4+5Ø2+1+1
ÐAஹ8ᑖ·AḄ¶·ᕜ¹T=24º=fBᦑAஹBᙠᑖ·ᜐÙ&Ú4⍗Rឋ./Üᣚp<ὅḄ./ᜧÞ4ÐFAᔣXBef$¸Aஹ3ÙßÚᙠᑖ·¤4⍗ᐹᨵᐳᔣXḄ./á¥â&㶥ä$å*.ூ¤æ௃¶ç⚪-RSḄéᵨὶNãᩭë%ᔜìíîḄï¤ᑁð]%ñ¤ᑁð.ìç⚪ò%óôḄç⚪õõ]%ó*Ḅç⚪᢬᣾ᐸ◚ùᙠ*Ḅúûü᝱%þìç⚪Ḅ᪶.᜜⚪ᙠḄᨵ“''Ḅᦪ^ᦪ!"#$⚪%&'()⚪*+,-ᩖḄ/012/03456ᐭḄ8Ḅ9:;<#᝞>ᑭᵨᦪAB5Cᜧ/0EFG)⚪ὅIJKLMNOPḄQ)*+.45.2020•ᐰT•UVWXYZᐝ\]6^ᜩᦻ;a஻G஺Y2015d✌fghᑮᓝkᐝd᜜lmnoᔠqrḄ6^s᰿uvᚆᳮyᐵ{|ᙠ6^}mnḄ⚜஺mnoᔠ*+ᑖ&V▤▤a▤Ymnᙠ☢ᑁᙊᕜḄ/aYᜫḄᓄ&6ὅ¡⌲£☠¥¦▤aoᔠ▤Ylmnoᔠ&mn¥ᨬ¨▤a⊦₩▤YoᔠḄmn«¬⊝¯᝱ᡂ&²³Ḅmn஺ᙠ▤´µᶍmnḄO}ᜧ·ᑣlmnᙳºN&Eᑖ»ឤ&M½஻Ḅ஺8¾¿ÀÁÂ/஺ÄÅÀ5⌲£'·஺Ꮇ³◀6^᜜Èᐸ8EὑᦣÌὃ⇋6ḄBÏᵨºᵨÐÑ6ᳮyÒÓᜐᳮ஺1
6^Õ᳛◀½6×EGᡂØÙ¿᜜Úº½mnḄEM½஻?ஹmn¿ÀḄÁÂL,ÝÞḄßE/ஹàá4஺}6^Ḅâãá4aᐸᜧ·ä{åæ,Ḅᐝác
ᨵᐵç⌱éêëìḄVᱥᳮE½Gîïð6^Õ᳛Ḅ⊤ò¡aᎷóᐸ,ºô³ḄÈEõÙö×ᦪ&஺Y¥2
´ᙠ÷øÅù/=0Åmn¿ÀḄÁÂ&ú6^Õ᳛⊤ò¡,ḄÈEõÙö×ᦪa#ûü

84Ḅþmnÿz=0
360஺ᡠ◤⌕Ḅ(3)ᱏ0
Ḅា!ᐸ#Ḅ$%?c5I^]11UG2M"madM+mூ(ᫀ௃(l)P=aGீQC8aG3M+(ᵨ+/)c5I^21=e—6஺5aG5!2Mm>jM+mnூ1᪆௃ூ31௃(1)456789᳛Ḅ⊤<=P=aGIAcoica=>a!?@AḄBCᦪ+§!FGHIᑣ3[P]=MI3T~="N"’37-ᵫQ=R2-1=1{24+5+3=2g+cr+2=3ᵫSTU1R2=2,J=6,5=-5ὶW1RXaGI2(o62c5(2)YZ[ᙊᕜ^_c@dMemḄfL,ᑮḄᑖid/?eᵫ`a45GbR2Mm=2rMmlG£=Meo2RᵫQ=ὶWRG(M+tn)3~z/ᑣmn@lGMmG"3Mm,,,E=----------=----------------rva)-132L2(M+m)”3ᑣ456789᳛opq

85„dEG"3Mmdo)P=-------=---------------r-r4=஺஺=0)t=0
$ᙌ஺=4+2ᐭQ=R_c^G5l2Mm7raylM+mSaG^MmiM+m)[c51^2(3)ᵫQ|ὶWR1/4■_8aG513Mmt8/3LT»—-GV"y/11V/1/-4F-H஻lX)"3“c5(M+/$L=g4N15c5cl128aG3Mm(M+m)vḄᦪd

86Q21805aG52Mm-]M+mn46.2020ᐰᡃᜧ¡¢ᦣ¤>¥¦§2018¨©ᡂ«ᢗᐭᵨᙠ¯⚞±ᨵx³Ḅᵨ஺ᔊµQ¶·¸¹ᙠ1932¨✌I¼½¾>¥Ḅ¿ᙠ«ÀÁ¾Ḅ@Â឵ÄÅᙠ1939¨ÆÇᵨ>¥ÈÉÊË¥᪶Íᐸᑖ¤ÎÏÁ>¥4ÆÐ=Ñ஺d¾Ð=ÑnÒᢝÔÍÕᙢ×ØÍÙÚÛឋÝÞÊ᪶ÏÁḄ>¥᠒ᓄ஺áὃ⇋fväᦔ஺æ1¶·¸¹ᵨ>¥æ@dçÈÉ@dಗḄ☟ê☰᪶æì᪶Hᡈï᪶"N,@d%ᡈ14m3஺óôḄ^_஺c☰᪶ḄÁ8_@õᐭ8>¥Ḅ#_@öḄᜳøda,úûÁü☰᪶ḄÁ8ý᳛ᓃe>¥Ḅÿ᳛vᑖ᳛%Ḅᐵ஺᪶Ḅᨬᜧ᳛3.30xIO,m/s,&᪶Ḅᨬᜧ᳛4.70x10"m/s,,-./Ḅ0஺123ᙠ5678&᪶9:;<ᑮ7>Ḅ?@AB.ᎷD&᪶EFGH☟JḄKLMNOḄḄ᳛PH/,OAPQ&᪶᳛ḄRSᨬᜧ஺TUVWXYZMOA[&᪶Ḅ\;Ḅ\;]^N_`133DWXYMOAabḄᜐdef⊝h᝱Kᐸ᳛klmnopᑖqrsHtuᐻwxSK7yḄz{|}஺TUVᙠef⊝GKḄᨬᭆᯠ᳛ᡠ{Ḅ\;.ᨬᭆᯠ\;஺ூᫀ”13+ᗔᓃ2-2/ᓃ10§£=஻ᐭ2,1.1஻%,3.07xl07m/s1232বT,ூ᪆௃ூ௃113}☟JḄ☰᪶OAKOA¡¢}£ᔣ¥ᳫᳫ§?¨Ḅᜳªa஺ᙠ¥ᳫ§?¨.}£ᔣᡠ¬Ḅf☢5K¯x°±¥ᳫ§?¨K}ᚖ³d?¨Ḅ£ᔣy°஺DOA[Ḅ᳛v,±Ḽx°£ᔣḄ}ᑖSᓃK3K°£ᔣḄ}ᑖSᓃKOA[☰᪶᳛ᓃK¶173OA¡[±ḼX°.3K°£ᔣ\Sᑖ¸ឤmvcosa-mv+mV3nxymvsina=mv0Yrs1+2¶1¿3

87mv.O[À᪶Ḅ\SÁᵨ᪀ᡂ7ÅᔠḄট

88(2)}ᓃḄ&14᪶Ç@}/ḄÈi8OAKᙠLMOA[Éᨬᜧ᳛RSᩩËÌK&14᪶Ḅ}ÍḄÎ}KK\S¸ឤ.;S¸ឤᑖmv+my=mv^+my0titM|+gÏᓃ2=1mv0+ÁᓃᵫঢÒ—=l-a+«^-@%%Ò%%rsKᵨÓ⚪ÕᩩËᓃ=0ᡠ,ḄMᦪ஻klᓽH14w„(1-a")2vj=1x1.16/?7
HᵫতÙKkl£ÚḄᨬÛ]Ḅ0H71=2O(3)᪷Ýmnop᳛ᑖqntv2/(p)=4n(-^-)-e-^v22TVKT᳛Þ᩽ᜧ0ḄᩩËHàdv”0,:áᨬᭆᯠ᳛%=J^~Vmᨬᭆᯠ᳛{Ḅ\;

89£P=^mvv=knTDâãᦪN,ᵫ\;ᑖqäᦪå:á5»ᵫ᳛ᑖqäᦪḄå:á/(v)=—NdvᡠdN_1[2E,/13==■IfG——NdEyj2mEVmkkæᔠ56ç8ÒKᓄéᑮ2ê—\;Þ᩽ᜧ0ḄᩩËìR=°dEkᵫí:áᨬᭆᯠ\;=দKp2b2Poîᑖ᪗ðñ⚪ᐳ40ᑖKᐸজঢÒᔜ5ᑖKঝঞটঠডণতথü2ᑖ஺47.2020•ᐰ•ÿ
ᨬᵫḄᳮᡠ⚜஺1932Ẇ!"ᵯḄ——%ᵯ஺&'()*▮,!"-.஺ᵨᓫ1236.8GeVḄ41-567☟9Ḅ-☰;<=-ᐸ?@3p+p-----------------p+p+p+1JT+…-A-BC;<=7rDE&ᙠ-5GHIJKᨵᜧ2ᐔOD஺PQRST-ḄUVWXYᳮQ஺-MAᐔODGZ[\]^_`ᦪᘤcஹS?AS”S1eS஺fg/=12m,ᙠS?AS3klmXᨵᑗopq`ᦪᘤC,ACz஺ᑗopq`ᦪᘤ\]STᑗopqrstᵯᙠD-HḄuvwxy]D-Hᐝwᡠ{Ḅᵯ|r}~tᵯḄuvwx஺GwxḄᐔODCwx᠒Ḅ-஺UVHS,ḄᵨRV☢Ḅ`ᦪRᔲU஺21
ᙠ?HᎷ᝱-A-wxf-cuvᑮᡠ◤Ḅl஺De-v1fᐔ-DuvᑮS2ᡠ◤Ḅl஺஺

90(2)uvw᳛3v(v>c/஻)Ḅtᵯ\]ᢚ᳛3஻ḄD-ᡠ<=Ḅᑗopqr¡¢£ᔣetᵯ"•Ḅuv£ᔣḄᜳ§(3)¨ᑖ@ᑗopq`ᦪᘤ;ªw᳛ᙠ«O¬lḄᦪ஺PQRᐸᐵ¯°(QH²)³´µ¶ḄYᳮᒈ☢Q஺ᐝᦈ¹º»ᒹ½¾¿3RḄᳫ☢ÁA¾¿;ÂḄÃÄᐝ▋஺Æᑗopqr¡¢£ᔣetᵯuv£ᔣḄᜳ§஺ÇÈᳫ☢ÁÉtᵯ{ḄᑗopqrÊËᙠᐸᯖÍ☢Îᡂ¾¿3•ḄrᐝÃ஺ᢗᙠ`ᦪᘤ஺µ¯w᳛3vḄtᵯ{ḄrᐝÃḄ¾¿஺(4)-e-f⍗Ê=BC?p+p-3ᐔ°஺?᝱ḄÓv1e?Ô᝱ḄÓv1kÕᓽ3?1Q஺3×ᓫØÙᎷ-A-Ḅv1;Úᶍ஺᝱¬ᐔ஺DḄÓv1RO¬Ü2;ᵨDalitzQ⊤ÞÓv1ᙠ¬ᐔ஺DklḄᑖß஺᝞PQᡠÞDalitzQRO¬431Ḅ.á§ÎPâᑮáḄgã.¯¬ᐔ஺DḄv1ᓰ?1Ḅå᳛ᓽ4=%/Q,4,.⊤Þèj¬஺DḄv7t1i=l,2,3஺ªëá3X°ëáHâ3YâëáḄHᚖ3í°îïᙶ᪗º஺òâ;1ḄᑖóõáöḄ⊤÷@ᵨ?1Qஹᐔ஺D-2AøHḄᐝwc⊤Þ஺ùúᑭ..=0PâḄᑖóõáöḄ⊤÷@஺üýþøHḄᐝwc=2.998xlOXm/s,--2=938.272()MeV/,Hឋᐔ
M„=\34.9766MeV/c2,ᵯ/
M.=139.5702MeV/c271Jt-oூᫀ௃(l)45.8ns,40ns(2)ᙊ┵ᒹ☢Ḅᔣarccos-^2T

91ூ᪆௃ூ௃(1)ᐭ$%&Ḅ'(P=ᔩ-)2=6.735GeV/cজ67Ḅ8Ḅ'PR=—=1.684GeV/cঝP4ᡈὅὡ+@/=4AজBCᖃEᱏ7ঝ8ḄG'HIP-c2,p=0.873cঞM+N48OஹG'ᑮ⎃ḄSTᓃ=1=45.8ns஺টV-ᐔ
Ḅ&4=£*“+C=5-%+/ঠᐔ
ḄG'HI(ᓃ=7=©0¾=0992cডnitᐔ
O"G'ᑮ⎃ḄST4=J=40ns஺ঢ(2)gḄHI(¥,ijḄᐝH(C/"஺mv>c//gO1G'ᑮ2SgᙠᐸG'ḄrstḄᔜvᡠxyḄijḄᵯz{|ᡂ~ᙊ┵|ᒹ☢᝞ᡠ஺$ᔣᙊ┵ᒹ☢Ḅᔣcos0——0ণnvᡠ஺=arccos^—nV

92

93y/d+2dஹK

94Q/RḄᒴ7ᳫ9:ᐸ7;ḄḄ/<=>ᐔ᜛RsB23/RஹC./LḄᒴ7ᙊF9:ᐸ7;GHIᙊFJ☢ḄḄ/L=%""3"+"4M.O3MQᘤᵫᢞRSTUVᘤᑁX᠒Z[R\ᘤᑁ[☢ᑮJ^Ḅ_`/?/cdᘤefghO4Mjk“mᑣ⌚”Ḅqrᩩt஺ூvᫀ௃(1)40.5333°;(2)12.306p,7t/?5,0.122624O3M1.23526/?O4M7;Iᢞ;ᡈXCH=~XQZCH=ZQூ᪆௃ூ௃O1MᎷ᦮ᘤ;Rᑖ/CᙊF^ᑖOD2ᳫ^ᑖOIIM஺ᙠᙶ᪗XOZRᙊF^ᑖ7;Ḅ"#/JCI=0,z0=J=RC2ᳫ^ᑖ7;Ḅ"#/¢Oᵯ—2”¥_|6=_ª/?=_0.6495/?জx=
,z=----------------rnruO¦M&᦮;9Ḅ7;ᙶ᪗/O=°ZcMRᑣ2ஹ/2᜛ᐔ®+°±²³=᜛±/´᜛µ¶23I_Q_®¸-º)_5(3-6)Xc'Zc=4(3/+26)=-i^R=°3962Rঝ¿ÀᙢR᦮ᘤ;^ᑖḄ7;ᙶ᪗/3(2Z2-7?j2)21%=f=0.3R,z”R==......==—R=0.6563RঞcR4(3/+2/?,)32ᔩ;ÅᑖÆ᦮ᘤ;ᘤḄ7᦮ᘤ;^ᑖÇᡠ◤Ḅ7RᨵÀ=pÁOÊ+/M,%=ᨴᐔÌBOÍ+/M᦮ÎÏḄ7;ᙶ᪗/,Ð+OᔩMRMO3/+2RJÑ+OfM~~-3/O8-ÕM+2OÖ_ᵨM3
5-36R=-09:77Rট5

95᜜Zc+Ù
Zc3&+R|
O2Ú*R0
+ÑM--43/>+4
+2Oᵨ+7?k+ᵨMÛ=-3^-5
7?=0.2942/?2ᢞḄ"#/O-BÖÜR,ᘤᑁÝÞ[ᢞᘤßàḄ./4.ZC-ZQ2556-3
á=arccot--------=arccot---------------04â1211QA°=0.707439x-=40.5333°ড(2)ᵫᳫ3Ḅ,R2ᳫᐸJ☢ᙊ3Ḅ/ᵫHäᳮ,R2ᳫæ:ᐸ7;GHᐸJ☢ḄḄ/4=/“§”ᑁèé=—^5=0.1729^/?5ঢë/;ᘤᢞìíḄ/7t01+îïð+ñ&+zj+I+pnRl4+ò-2஺)ণ2l43UJ\o))=79588+7591663283/RR6050xô;^ᑖᢞìíḄ/=R2+஺1ᐔõ/(4+஺+(g-zj+/1<+,01*(%+/)+ðR|+zjতJ24953-385஺a3.஺223ᡠᑁ60501,ᘤᢞìíḄ,,,(54635+11441V3)Ð,øᔣI97n/=//´------ù6---------8ᐔR=12,306^(71/?7;ᑮᢞíḄ_`RO3/+2RJY3O&+6
O2/_8ÕM_ஹ3/ORB-RB
+2Oᵨ/?B
+"
+43/&+Rj+2ORB+&N+R
%=’ᔩI%&430848-175416ᓺ/?'=0.02722஺ᐔNª+/)-R(ª+þ(5+3ÿ/?üý´ᨴᐔÂᘤᢞ᤮Ḅ⚣᳛

963
ᘤ☢ḄḄ!஺#ஹᘤ%&᦮()*+Ḅ,ᙶ᪗&sஹ/0%ᑖ3Xc=3(5/&)R=-o.l177Rᦑᨵx(m+n)=mx+mxQsscsqc;—£ᐔs2ᦑḄ)GᜧFIJKᳫḄMᘤNᓽ஻ுR஺RSᨵ2m=-p^itR3+pnR2(h-7?)=0.9018pitR3@s22;1=(23-967=]23526Rধ6#᦮()*+ḄXᙶ᪗_Z[+ẑ2Z03^R-R_2`_>_Rb+᜛▬_2"-4ṹ+Rfg""h2-4ij3/ᵨ-6
+2_ᵨḄf+᜜ὡ_3n஽g3(2஻2-4/?R+25R2)=0.271326/?<4[3/?+(29+18V3)/?]ᦑZz=1.23526Rᘤpq஺_Zrs4ᘤuvNᐭ4NḄ+uv

97x=t=0.37?cs-(/?-/»)■!@(Rஹ2)ᜐߟ`^|}+~qߟ1^ஹ-RᘤḄm0#ᘤḄ+ᑖ3m=Pஹ(|*+-(#b+2bM3/(*/?<)+2gM)]=bᐔ(6-Rj[3/(&+RJ+2(Rb+RR+R<)]᦮(vḄ+C,,Ḅuvᙶ᪗x_mx+wbx_[p,/?|2(3/+2/?()+ph2(/?-3/?,)]r[ஹccs2+ẑ-p,[3/(/?,2-/?b)+2(/?,5-/?b)]+p/z2-3/?,)23/?(24/?3-3n/?+10[(/?-3/?)/z2-6(5+3«)R1ᘤpqNᢞ*+Ḅᨵ%=%=-஺//7N;/i=-0.8394/?,/?=1.2389/?,஻=2.5996R,ᙳ0<஻R…/Nঞஹট(ঞஹট/=/?-)N;Ḅ+uvx=t=0.37?cs஺᜛2ᐔ(<-z2)zdz+J<*pÃRzdz3ফ2—4/?R+R2)Zcs=J

98_3_3஻-257?´10j3/z+_29+18^7?f,¶+43^_·-R¸2ᐭRbRb+_2஻-4Ẇ+Rf±+/24{.j3f_ᵯ—Rb+2_R<—ᕜf+0ᓾ_3஻½}3_2"4¿+25/413n+_29+18ÀRfᘤpqNᢞ*+Ḅᨵx=x=-OAhCl2QÁுNᵫNᨵh=-K+ÃN/+2«—g/+2<f=_23-9^3j235267?@R=3jÈᵨ_"j6SᵫZg?@ABCᐸDEḄF(Gᙊᑁ/HIJKLᜐNOKP᝱RS!"L,ᳫᒑT9ᙊḄU@VWXYZ,ᳫ[Ḽᙊ]^JKLᜐN_`P᝱ᳫẆbᵨdeT9ᙊḄU@fNghijk01,ᳫGᙊᑁ/gᓣm%nABῃ_ᙊKJLᜐNpKP᝱qrsḄ!"tRS!"Lq஺Fuv@ᜧ-g,x:1{|ᳫ}~bḄᙊU@Ḅ;2{|,ᳫ!"ḄqrbᵨᨬᜧSḄᙊU@,ᳫ!"Ḅᨬᜧqr஺ᑭᵨ^`…4ᙳ}ᦪᑣF…n4=%=…=4Sᡂo

99ூ¡ᫀ௃প0inarR®ᵫR¯ᳫ}~bSᙊḄU@(2)|,ᳫ!"Ḅqrbᵨᨬᜧ,ᳫ°ᙠᙊ±²☢gᜐNpKP᝱஺Ꮇ,ᳫLµᓣm஺nS-ᳫ¶·ῃ_/bp¸¹஺RS/,ᳫḄ}ºu»ᵫ¼½¾¿>Àᨵ2mgcosa=m—@saÁ0nÂNÃᡠᙠ±²☢s`CḄÅ.ÆÇÈᔣḄᜳUVÁ,ᳫᙠ0npKSḄ@(̦⚪14a)஺A¦⚪14aᵫঞ¯v=[gRcosa©ᳫῃ_/bp¸¹ᙠOÎnᙶ᪗4sᨵaY2Y2Y=Xtana------3-----—=Xtana-----------—ঠ2v"cosa27?cosa,ᳫᡠᙠḄᙊ²☢ḄᙊᕜÈÒ(X-Rsina)2+(/+/?cosa)2=R2ডÈÒÓঠডᨵi&¦ᐸ%(0,0),ÖÁp×n஺Ḅᙶ᪗Tᐸ¿ÁᳫḄKnAḄᙶ᪗X.=4/?sinacos2a2ঢᓃ=-4Rcosasin~a

100,ᳫᙠAnḄ@ᓃ.=vcosa,I—ণv=©2gH=3vsinays”Á,ᳫÛp¸¹Ḅᨬ?nÂNAnḄ?@H=''Ý஺஻=-/?cosasin2a(9)2gA2JAnÂNCnḄÅ.ÈᔣḄᜳUÞᑣᵫßàᐵ4ᨵsinp="=(4si/a-1)cosaথRãᳮᨵcosp=—jsina._a-1)sinaᵫণথ¯,ᳫᙠAnᚖÇN/Ḅ@(ᡭr▬ᙠ/gḄ!tḄ@)v„=vcos0+vஹ.sin0=8vsin3ezcosa
tᵫট
¯v„=8/^[sin4a(l-sin2(z)J4A9=16x3<7^
sḄs'&=(1-sin2a)SᡂNÁᨵa=arcsinÖSᵫ-ᳫḄᔣ@ᨬᜧᓽ-ᳫ!"Ḅqrbᵨᨬᜧ஺Iᡈ⌕|-ᳫ!"Ḅqrbᵨᨬᜧîï|-ᳫḄᔣ@ᨬᜧᓽð•=6jRgsin2ayJcosa(1+3cos2a)=0da¦¯a=arcsin—RSᙊḄU@

101=0.7598ᔁ,ᳫ!"ḄqrW=5஻ó=32mV2sin6acos2a=32wg/?sin6«cos3aôõᐭ¯,ᳫ!"Ḅᨬᜧqr%=2j%f'"gR=l-8247/gR50.2021•ᐰø•?ùúû᝞%&üḄᙳ'VᳫᔣgஹJi&ý>Ḅþÿ
3ᜐXᔣyᔣZᔣᢥ!"#$஺&'(ᳫ*+,Ḅᑖ/0%XZ2ᔣḄᑖ/0o,ᳫ34ᳫ*Ḅ567Z8Ḅ9+,ᜧ;0538=<%.1r஺<ὃ⇋?@஺518ABᳫC1ᳫ*+,Ḅᑖ/*DᳫEFḄ9+,GH52ABᳫC2ᳫ*+,Ḅᑖ/IDᳫEFḄ9+,ᱝK;
3ABᳫC3ᳫ*+,Ḅᑖ/ᓃ,DᳫEFḄ9+,஺g஺PQKRSTU/0“ஹXY0ZḄᙳUᳫ\34ᳫ*ḄḄEF]/0J=2஻//5;Bᳫ_T`aUbcᳫ\dᙠa☢gḄhijk0_lᐰnឋḄᣚq
ᙠrstuFdᙠrsvᑮ☟᥅z@{@(|}ḄᑗᔣDᔣjk0_nឋḄ0ᓄᎷ`_tᐵḄ5Ḅn@ᔜᙳ0@8஺……3410%.3-3124ூᔠᫀ௃51v=-v+-rco

102©ªm_BᳫḄU/@_«ᳫḄ᥅z@/,_«ᳫḄ{@d¬«ᳫᵨ(¯=4-%᩽±²_ᳫ34ᳫ*Ḅ567z8ḄEF]/஺ᑭᵨজঞ©´µ¶஻·%-%»8=T¹5Tᳫ8টrᵫfy»ḄnឋYᔣḄឋUᨵI1,2/2mvb'=2M%-ᳫḄ+,½$ᙠ4Ḅᵨhᔣᵫ²»ḄnឋᑗᔣḄឋU5¾ᓽtuF8ᨵ1.2121»212/5À:+2mv\x=2+2mv°xjÂ/ÃᙠᳫḄÄF"EÄF
Å6ÆᣚÄFḄÂ/ᢝ<È+,ᙠÉ2ᔣh஺g©ᓽ+=-45ÊTÀJ
ᙠ+À:8ডটঠড©_BᳫhiÄFḄF@Í2Î஺dḄ_%=%*ÀH=/Dᓃஹ+%.,=஻54+Ð8ঢÉὅ«7£=0,Èᐝuᳫᐵὅ〉ᔠ7BᳫḄhiÄF஺ঢ©ᓽ5%T"H8=T5%Ö×Ð8ণÙ”,TᔆÛ8ᓽ0ᳫgrḄsᙠÉḄ+,஺ᵫটণ©D,22J.=—mÄZ5¶34KHত10v3ÅOx7r72
Ýὃ⇋ᳫÞᔣgßg5C28ÉᵫF/$ᳮD9F/$ᳮS঩5%-"8=-4²@y2ᔣḄF/$ᳮ⊤á©ঝ©ãä5å⊤ß8஺

103èéKᵫ7☟᥅z@Ḅ@êhë충íঞ©îïðTñò51
஺ãäóᳮ¶34^%=ᓝ%=TôõTöH7r7ὶ©তথতথ©¶-3124%=%+øù஺:60%r31C-49r49Lú_ᢣßḄ_üᨵ%,=Tᓃ=%853
ᨬὃ⇋ᳫÞgᔣß5C38ãä7তথ©ᨵ34…ᓃᔞ+ÿ஻ᵯ©10v32x%=7-%ধ7r7y2ᔣḄF/$ᳮ⊤á©ঝ©ãä5å⊤ß8஺ὶýদধ©¶33352ᓃ,=-%ন%=343+343঩ᢣḄᨵ%=1%,