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KÌ THI CHỌN HỌC SINH GIỎI Đồng Nai 2010

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!I$!.n=p8    /  - ( # #  #$.8  -    #   &K ( #$  7/       -  # * .  .8  !$S  !8   * !   !.$ *    + , q X  V uur + , A 1 A 2 A   h     Câu 5 2( 4 điê ̉ m )     .8  ' * r#  -/  #  '   * #$  #  7   ?"%3  -/  #-'  D5/ (   - * 7  Q3      #'  7  / 8  35 ( 2 &,-  /  8  -/  #.$ * #  #$ *   / ( Q3   *    # * $  S  .8    s#28    .8  #$# * '  #   &X/ ( #  -  Q"8  -/  #  3  !8  # *   .8  7$#$. - * .$ * #  #/ (   .8  3    8  #  7  /  Q7 .S  .8  #$3  7  !$  #$  -/  .8  .- *   j  ? t#26  #-  3  !8    .8    #   #&X/ ( #  -  Q3     * .$ * #  #h?%u#"!         .8  5$/7$7$3  !  ##8  # * $  8  #$    3  !8  # *   .8    -/  .8  # * 3  7   !$  !   #$  .8  #/  #$ *   26  #-    !  $ *     3  3  !8    .8  .-$   Q h !  ##8  ` SƠ ̉ GIA ́ O DU ̣ C VA ̀ ĐA ̀ O TA ̣ O ĐÔ ̀ NG NAI HƯƠ ́ NG DÂ ̃ N CHÂ ́ M THI VA ̀ BIÊ ̉ U ĐIÊ ̉ M KY ̀ THI CHO ̣ N HO ̣ C SINH GIO ̉ I LƠ ́ P 12,VO ̀ NG 2 MÔN VÂ ̣ T LY ́ NĂM HO ̣ C 2010 – 2011 Câu 1 : (4 điểm) 9 B1 "%- X$  q  !- * # * HXH X   /    3  !8  3  3    ## * .   # *   73#  2   !8  # * X-/  #D  #-   *  ( ) .2 / 3 2 2 / 3 5 l m OG l m m = = + "%- 5$-     * $$  -  /  #$   0 2 2 3 3 G mV m m V   = +  ÷   uur uur 0 2 5 G V V⇒ = uur uur & "%- "%-  $5S  8  -  3  .  # *   ( ) 2 2 2 2 1 2 2 3 11 2 12 5 3 5 15 l m I m l m l ml     = + + =  ÷  ÷      "%- 5$-     * $$  $5-  /  #$   2 2 0 2 3 11 3 5 3 / 5 15 m V l ml l   =  ÷   "%- 0 6 . 11 V l ω ⇒ = & "%-   73#  .  # *   # * -      3  3    # G V uur -/  #D  #-   * &3  $      S!$'  ' * SX 3    #-  $  #-/  #D  #-   * & "%- 9 B1 "%-   '# *   !/  #3#   2 2 1 0 0 1 2 2 3 3 m m E V V   = =  ÷   "%-   '# *   73#   2 2 2 1 2 1 2 3 2 G m E m V I ω   = + +  ÷    "%- K 2 2 0 8 33 E mV = "%-    * # * -  '# *   !$S  !8  3#   2 1 2 0 1 11 E E E mV∆ = − = "%- + , q X Câu 2 : (4 điểm) 9 B1 "- ` * /    #3#  "    D  #3  /  !$7    $  D$  5   !$7        3    ]&1$-  -  $  3  #.8       π + = m m T k "%- "%- "%-   .$ *   #  8        "  π + ∆ = = ≈ m mT t s k "%-     ## *     ]&73#  -/  #D  #-   *  0 0 0 0 3 2 2 3 m m V V v v = ⇒ = "%- `3    '  -  !  .$ * /  "5$-     * $$  '/   8    #-  # *     ]&# (    0 v 2     ## * .  # *   -/  #D  #-   *  ( ) ( ) 1 2 1 0 / 2 / 2 G m m m V m m v + + = + 0 0,3 / 5 G V V m s⇒ = = "%- "%- "%- 9 B1 "- X'    S#  3  $.  # *   "!$  S#    #$   ( ) 1 1 2 2 / 2 0m m v m v+ + = ur uur !$-$   1 v ur 3   2 v uur   /    3    ## *   ]&3      3    ]&3    # * -  /  ##  3  .3    ## * 3    !   8  3    ## * 3  .# ( !   2 h  #  #  1  # * $  D$$'  ##/  #-  $'  ##/  # * 2 "%- "%- "%-     1  # * $  D$  #  -/  #8   *  ( ) ( ) ( ) 2 2 2 1 0 2 1 1 1 / 2 2 2 2 G G k l m m v V m V ∆ = + − + − ( ) ( ) ( ) 2 2 2 1 0 2 1 1 1 / 2 2 2 2 G G k l m m v V m V ∆ = + − + − 0 1 15 m l V cm k ⇒ ∆ = = "%- "%- "%-   #  1  #/  #-  # * $  D$   max 0 51l l l cm = + ∆ =   #  1  #/  # * #  $  D$   min 0 49l l l cm = − ∆ = "%- "%- Câu 3 : (4 điểm) 9 B1 4"%- X$    "  "  /    #/  -  /  #  S#  #5.  +  "+  "+H 1 ϕ    -    #/ (   3  u AB 25$/  35#S"#$   * -  35# &/8  35 (  2 2 1 2 1 2 1 2 sinI I I I I ϕ = + − ( ) 2 2 2 2 2 1 1 2 C L C C C L Z Z Z Z Z Z R Z − ⇒ = + + "%- "%- 5$cV.9?9  #/e-BR##b.fB#3I$W vI\!gw.fB#3I$W2 <    C L C Z Z Z − =   ⇔ = = C L Z Z Z & "%- "%- L.[#.W?W  5$ *   u AB 3Ii #a /   * -  35#&#)      7 ϕ + = = L C R Z I I Z &         7 #$7 2 ϕ ϕ ϕ = = + L L Z tg R Z & /  &3  &#$       − + = L L C Z Z Z R & x&3I&#)     C L Z Z Z R= = = = Ω "%- "%- "%- "%-   L Z rad s L ω π ⇒ = = u     C C F Z ω π − = = "%- "%- j$ C Z Z=  7=#^#_+  #yI7=#^#_+ K:-:V:1f-O-$RR# 2  AB C U I Z IZ V= = = Q=#^#_5.V+        AB AB U U I A Z R = = = "%- "%- "%- 9 B1 "s%- Vu AB #a3@iT ( )  C L L R Z Z Z= − d/!T3:3@WT − < C L Z Z u   ω π − ⇔ > = L C F Z "%- "%- "%- 2 I ur I r U ur & 1 I ur 2 I ur I r U ur & Câu 4 : (4 điểm) 9 B1 "%- j$#   * # * -  !  #   S  !8  1 (  * # * .8   -/  #D5  -' *   2   -  # * .8    #i'  -  !I$!.n=-/  #8   *        h       − = = "%- "%-   /  - ( !  #$.8    #           %W z 9 W&  &    &  = + − = −  K   %Wh  & z  − − =   "%- "%- 9 B1 "s%- Lm  ?K2h{#-O[7E.8  I  ?K]&K&"  X|Q    1  # *   HDI#  #$#Bi#$    !$ ="#$   h}&QK]&?  W h}D&QK]D&? W   h D&K D& h D&K D&    h &K & K & − + − + ⇒ = = − + + & "%- "%- "%-     /  #  #5$D3  -  #/  #-  .   h m h K D   − − = = I:-BG3@[!  D! I      h K& h K&    uh &K & uK & + + = = − + + `i#c  .n=8  :-B#_.8  I   h2K   K & = +  "%- "%- "%- /  &#$    h K D 1  1D K & − − = + q"%- Biện luận:9$  4.c'7 2  m  ?K~h8  hrKrD3@|D 1 1/":-B'2 2  hrKr&~m  ?K•hr&8  hrKrD& 1/"1":-Bc2 42  $L#hr&•K•h8  !$S[!8  i#c.n=" :-B'/    -    "7-$  c-    5$I7=<#& "%- "%- "%- Câu 5 : (4 điểm) 9 B1 "- X$    .$ * #  #/ ( 3  3   *   # * $  "#$   2 ' 2 0 d a d d d ad fa d f = + = ⇒ − + = −  *      *   8  & * #$    /  -$  #$   min 18 4 a f cm = = ,  .8  '  #  -/  #8   *  ( ) 1 9R f n cm = − = "%- "%- "%- "%- 9 B1 "s%-  * $ *  ( -  .  # *   $  8  #  $  .$ *   .8    #   7$7$r8 (    * Q€  #   * 3#/  #     .8   * -'  #  #Q  -$  -  '  •?#   -/  .8  # * 3  7  # (   -/  .8  # * !8    .8   "%- "%- "%- 9# B1 "%- 8  735 ( -/  #8    $3  7  !    "%- X$  j  -/  .8  # * 3  7  !   "#$   ' ' 0 D d d L D d + − = K ( ) ( ) 0 1 . d L d f D D d f − − = + 65    7   ( ) 2 . x x f L fL y x f − + + = 2 ' 2 . x fL y x f − = , *     D • fL • € r]    "%- "%- "%- "%- "%- Q h   j#$  .8  #/  #$ *   . 18 3d fL cm = = X  !  # * j  min 0 2 L L D D f f   = −  ÷   K ( ) 6 3 2 3D cm= − "%- "%- "%-  . ĐÔ ̀ NG NAI HƯƠ ́ NG DÂ ̃ N CHÂ ́ M THI VA ̀ BIÊ ̉ U ĐIÊ ̉ M KY ̀ THI CHO ̣ N HO ̣ C SINH GIO ̉ I LƠ ́ P 12,VO ̀ NG 2 MÔN VÂ ̣ T LY ́ NĂM HO ̣ C 2010 –. ́ O DU ̣ C VA ̀ ĐA ̀ O TA ̣ O ĐÔ ̀ NG NAI  KI ̀ THI CHO ̣ N HO ̣ C SINH GIO ̉ I LƠ ́ P 12 VO ̀ NG 2 NĂM HO ̣ C 2010 – 2011        

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