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>RJB~>j>R•R~)• :X~•1~)•,]  )  ‡ D h h D = ],‚ K ‡  ~ • <K h cm= = i]"H$J1‚A BAˆRB3ˆ B)3~"• <)3 <)3 <)3 <)3 )~<3• : ‰ ~• ‰ = Š !4 ‹ I ‰  ‰ $ f >B2>RB2 " )  UŒ ‰ "JH6=;'1$J*1]'E"‚:5' JL'q<JH…],"† ) 1JH6=;'†N$ IV'4‚ †B† ) jqB N  >RJ• N ) >RJ †B ~N  •N ) •>RJB)>RJB <[ U1$4"$P∆iB>R +=I'4""D$]‚ )‡)‡ x S V SS V y = ∆ = − ∆ = :$ f I ‰ Œ ‰ " e !IŽ ‰ 'J ‰ ‚   B>R JN ) # N  >RBc" qI ‰ Q e J ‰ ) jcB[" i] Š =]4""D$‚ˆ cmx xx 2 K [ ) 2 ) =⇒==  i1=$]4 e Q ‹ '4 ‰ 4JH6=;' Ž'@X 7†B <[4Q'HL‚ JxFA 2)  22<3  2 K [<  )   )  −− === <3 <)3 <)3 <3 2~)•  ‹ 8 f =I'J4 f '$ e $ f "Q ‹ J8 ‹ '8 f  ‹ Q' Ž ‹  ‰ 8 f  f  s e , e 8 f  ‹ Q'Ž ‹  ‰ 8 f  f $ ‰ $ ‰ Œ ‰ 4 ‰  $J ‰   $ f   BN  >#N ) >B))<)~"• iI ‹ ]" ‹ 8 f =I'J4J ‰ ))<)j) B)<)~"•• <2~"•4 8 f !Q'Q'Ž ‹ $ ‰ $ ‰ <$'QŠ8 ‹ Q ‰  ‹  e  8 f  ‰ 8 f  f <4 ‹ Q ‹ IŽ ‰ ' e 4 ‹ J ‰   s$ ‹ J ‰ 4 ‰ $ e J8 ‹ '8 f  ‹ Q'Ž ‹ <Œ ‰ ,! Q'Ž ‹ $ f $ f 4 ‰ $J ‰ ˆ h∆ '!Q f J8 ‹ '!Q' ]Q e ‚ >N  B>~ˆ h∆ •N ) :$ f ‚ )  ) )<„~ • D h x cm D D ∆ = = − N$Œ ‰  f 4 ‹ <$ f 8'Œ ‰ IŽ ‰ '4 ‹ ,‚     ) ) )     ) ) ) ~ • ~ • 23<[ c ShD t xD Sh c SD h t c ShD t xD Sh t C c SD h λ λ − + = − + = − = − <„3 <3 <„3 [~<)3• N$'Q ‰ , f 'J8 f Ž ‹ 8 f I ‹ Ž f , f '4, Š  ‹ $ Œ f ,"Q ‹  ‰ 'Q f  ‰ "Q ‹  ‰ ' e Q f  ‰ 4" ‰  8 ‹ $ f ' ‰ $ f ' e Q f  AˆJŒ f  JI ‹  <3 R1 R' R O2 B A O H A2 O1 I N A1 B1 M B2 aBb‚ f !Œ f  e $ f ' aBbR‚! e 8 ‰ ''8 f  ‹ '$ ‰  ‰ ' e  ‰ ' e  Q f '$ ‰  ‰ '4" ‰        IO AO IO R AOI AO I IO AO IO d R ∆ ∆ ⇒ = ⇔ = + : :],Q f zaB)[" ‰ =$$ f ‚   c ~ •IO IO OO cm= + = ) ) ) ) )      IO A O A O I AO I IO A O ∆ ∆ ⇒ =: :],Q f za ) B^c" iI ‹ ] e Ž ‹ a )  f a  "Q ‹ $ ‹ ‚ a  a ) Bza  jza ) Bc j^cBc[" :Œ f bR‚iŒ ‰       ) ) ) ) ) ) ) HO O A HAO HB O HO O B ∆ ∆ ⇒ = =: ~• Ž ‹ ! f $ f Aa  ˆAa ) Ba  a ) Bc["~)• : ‰ ~• ‰ ~)•$ f Aa  B[ "      ON OH HAO HNO O A O H ∆ ∆ ⇒ =: ~2• :$'$ f aBbROa    Bb  B) "Oa  AB[ " aABaa  ja  AB^c" :] ‰ $~2•8 ‹ bRB[K" <3 <)3 ~ <„3• m4 e 4" ‰  ‰ Ž ‹ !Q'$ f $ f 'Œ ‰ I" e Œ Š  Ž f  e 8 e  ‹ Œ f a ) RŒ ‰ ‚ O'2 O1 A1 B1 O A'2 B'2 O2 N ‹  ‰ $ f "' f Q ‰ '= ‹ '  a  a ‰  ) Ra ) RaŒ f  8 ‹ aa ) RBK<c"<=$$ f a  a ) RBaa  jaa ) RB3[<[" A <)3 <)3 iI ‹ ] e = ‹ ]4 e Œ Š Ž f , f 'J ‹ 'I ‰ a  "Q ‹ $ ‹ ‚ a ) aR ) Ba  a ) ja  a ) RB^<c" <)3 3~• m‚cij2k <3 O ) d d I A R⇒ = = Ω $ ‹ ]I4 f 8 e  ‰ I ‰ b  BOb  B)j m!‚ ••)  ‹ ~b  ##m•b  :$I ‰  ‰ 4 e  ‰ , f 'Œ ‰ 8 ‰ 'Œ ‰ l  Bciz = B <3  Yƒ ‹  f $ f z  ˆz = Bz c 3 c <3 ) c x x x − ⇔ + = − ⇒ = Ω <3 <3 ~• m4 ‹ 8 e 8'8' e $ ‰ $ ‹ " ‹ J ‰ ‚ ) ) ) [[ ) 3~ )• ) [[ NC CM MN x x R R R x U x I R x x − + + = + = + + ⇒ = = − + + Q ‹ =$ ‰ '4 ‹ / ‰ J ‰ ‚ ) 3 ) ) [[ 3 [[ ) d d x x I I x x x I x x = = + − + + = − + + U=]4 e 4 ‰ Œ f Œ ‰ ' e "4"IŠ,Q f Ž'J4 ,]z = ' e "I ‹ ] ‰ Q f  <)3 <)3 <)3 <)3 .      Phßng gd- §T §Ò thi chän häc sinh giái líp 9 vÜnh têng N¨m häc 2010- 2011 m«n: VËt lý Thêi gian lµm bµi:. ('<XX=Z$]@P+ D,6'Mh]G71$9 Ghi chú: Giám thị coi thi không cần giải thích gì. Họ và tên hoc sinh: .;