 Đề 1 Bài làm Điểm   !"# $% & ' (  ) ! ) % & * ( +,% & , - # )  ../ ) ,, $01**2*3#,456!"#,#7 '!58+,+,2#.6, , 09:;<* =2*<*,>,?4@1 =A 4? ) ' & 7*30 ( / ( ,? ) 0 ( 7 - B & C D )  ) * ( * ( ? ) * ( *+ & B.=. E * ( * )  F ( * ( ? ) + & !,, ( 7+' ) #% & 7 ) 5+5/ ( * 0 (  G2*<*,>,?4@1=AH 2 d λ ∆ = I,J*%1*@*=KC0LC 0L9*C!M*=N?A?"*/' *3*!*/ F=K 2 l T g π = 0L 1 2 g f l π = 0L9* g l ω = M*=N?A 2 k g F m s m s mg l ω α = = = F/'*3 2 2 2 2 0 0 0 1 1 1 2 2 2 g W m s m s mgl l ω α = = = OF#,AP*9 *=K!" QCRs ?"+, Scm FTL*6,,!U*?V W?4@* +X.*,A # ,J75/4K ,J75/4K?VL* ,J75/4K,L* 0L9* 2 4 ( / )rad s T π ω π = = , 6 ( )A cm= + ( ) 2 rad π ϕ = 5/4K 6 cos 4 ( ) 2 x t cm π π   = +  ÷   5/4K?VL* 24 sin 4 ( / ) 2 v t cm s π π π   = − +  ÷   5/4K,L* 2 960 cos 4 ( / ) 2 v t cm s π π   = − +  ÷   RY,AP*9 75/4K R*0 O Z [ S x t cm π π   = −  ÷   @?V L*=,?VW?4@*9!, Ix cm = −  5/4K!,\ 2 2 2 2 v A x ω = + VL* ( ) 2 2 16 ( / )v A x cm s ω π = ± − = ± S],,AP*9*^ +,C*97+!!58!" Z [_ Z [ S I rad rad π π @7+ `87*3,4 ],,AP*9*^+,C7+  ( ) 1 2 2 4 rad ϕ ϕ π ϕ + = = aY094A,: b?c,+5c*09 cm @ =2*<*:?4@*97 +*309 2 x ϕ π λ = Y"  I π ϕ = A4   Z [ I rad π Jb d4 4x cm = eY094A4 "b, ", CSm ?c,,*L 56,W0<f*9I,g# 1C=%=g @ +5c*09 56,W0<f*9I,g#1C=%=g  1*!"*9RUCO+h dL#U,09 4k = ,A=,\09: 2 l k λ = 5c*09 λ = 0,8( )m A4 . 2 l T g π = 0L 1 2 g f l π = 0L9* g l ω = M*=N?A 2 k g F m s m s mg l ω α = = = F/'*3 2 2 2 2 0 0 0 1 1 1 2 2 2 g W m s m s. 56,W0<f*9I,g# 1 C=%=g @ +5c*09 56,W0<f*9I,g# 1 C=%=g   1* !"*9RUCO+h