Kiểm tra 1 tiết lớp 12 phần cơ học vật rắn

THPT NGUYỄN VIẾT XUÂN KIỂM TRA 1 TIẾT LỚP: 11 MÔN:VẬT LÝ Đề 1                                              ! " #$ %& '() *) + #,- ( '.& /  01  2 ',1 #,- '3 *)('1 4156&789- :   ; <1=1#,->,-?@1 AB CB B DB  E&$?)F!G,)3#,-'3#,& +('.&H A)')F I1('J K 1L) M)&N)')F  C)')F I11),(1L) M)&N)')F  1),(!6&O/J&P*13 #Q'L! D)')F I1('R)L) M)&N)')F   S,?,!/0FT/71)N6&7&U0) 1)N0) 6&7>,'V1&VI1&,/O&W&9H!)&P$ 0) #,-'3 A26&7 C26&7 26&7 D26&7 &,&W1 AC'V1&9&)3R) X2 0&()/PY1 2#,-#,& +Z @ 1,1#, 'OAJ11*)&,&&! ! 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"'1/PY1>,'()*)+' 0&()/PY1>, D1),(1>, 'h,426&a12 i1#,-'3#,& +#, J11*) j'h,]) A   C  /O /PY/('R)>,')F Ak&'h,>,')F Cl&'h,mk$&  '!L?@1n,?$0%& >,'h,C)F&W/)&o1)p, A   C  / A A ; C  C A ; C   A ; C   D A ; C    41 ! "#$%&e;201  2?$0%& lU&qm,)'PY "!!41&NGY)R-0&J1Rr0&J1PY*) A ;1 C ;12/9-1 ; 5G  C,'O&,)'PY1)p'W1-1,1?@1&,2G,'&`&s&&o &-F'1&U('1>,41/?,!&)0&)&,)$&&, '!L H  C A A,R5G C   ,R5G ,R5G D   ,R5G ?$&b"#,-&,&RO'3P t , K 1&, f )1&u v S,1)-2'L('1,R5G] ?$& b"#,-'PY!11)-&W/ A,R C,R ,R D,R 41?$0%& 2 ! "#$%&'()*)+/e; w 01  C,'O41',1 'W1-2$R+1!41 /\! f 'J K /[ f 0&J1'g)x;^)_6-_*)&1!)>,]),( 1>,41/ A,R5G  C,R5G  ,R5G  D,R5G  ,)'h,4 ! "#$%&e  e  ',1#,-'V1+1PY&)3*)('1! f ω  ω   lω  yω  m,G$k+#,-&i0&J1'$10Fc&, v &" K &!'h,R%&!&,2G, J K 0&!, v 1&[ t )1), 1= f &,)'u z ,! f  t 1('1ω/, t  Aω;       e e e e + ω + ω Cω;       e e e e ω + ω + ω;       e e e e ω + ω + Dω;       e e e e ω − ω + #,-'3#,& +('.&{&U ')F b$'.&$&+#,-{0&!`1 | A'/*1),(&P*1 &i&['/*1),(!6&O C'/*1),(&P*1 ?@1'/*1),(!6&O '/*1),(&P*1 /*&['/*1),(!6&O D'/*1),(&P*1 ?@1'/*1),()_6-_  &!'V&.(1&"!&N)1),>, ?$&b"&P&U&q] #,-'PY>,?$&b"!1`&N)1),&-F'1/ A,R C,R ,R D,R cTL1&$)1&}2 'h,?'O#,-#,&+('.&>,*)1),(10&J1'g)S, G2'h,#,-'PY 1,R] 'h,#,-'PY!1G)_6&"!/ A,R C,R ,R D,R  &,& W1 'V1 &9  &)3 R) X2 0&() /PY1 2 #,- #,&  + Z #, 1')F   J1 1 *) &,& &! ! " #$ %& >, &,& '() *) + Z /    l  ] &9')F 0&() /PY1  ! 'O&,&! "#$%&>,&o'()*)+Z/ A    l C    l      l D    l !)c$)<9/ #`O'V1&90&()/PY1 ;2   012?$0%&~;0  ! " #$%&'()*)+Z#, /   ~  89-:;2! "'1/PY1>,c$)<9!1&-F'1 #,-b1#,&+Z*)&0U1)N21)$.?@1 A2   01  5G C2   01  5G 2   01  5G D2   01  5G = f  ! "#$%&201  #,-'341!1G ! "'1/PY1>,' /*/ A01  5G C01  5G 01  5G D01  5G ! "/\$R+1/+#,-('.&1)$. •l,R5Gm     lGm   A0&J1'g)0&$0&J1&U/J/ #,-'3 CRP[1&U/J/ #,-&,&RO  &U/J/ #,-& RO D?@10&J1&U'W1-&!j#,-'3 E&P[1U&>,!L'1€&"!&N)1),!RP*)'- J` &-F'1#,-& RO'3 >, #,-#,&+('.&21PY&)3RP[1H A €;w•w  l,Rm C€;w•  l,Rm €;www  l,Rm D €;•w  l,Rm ',1#,-&"! &)3#,& +('.&c('1>,L)&,)&N)')F   ; G  ;G1)$./O/PY/ srad 5  = ω ‚ srad 5  = ω ]),(11?U&!10&!`1&N) 1),  ttt −=∆ 1)$./?,!&)H A,R5G   C,R5G   2,R5G   D,R5G   Một vật rắn quay xung quanh một trục với gia tốc góc không đổi . Sau thời gian t kể từ lúc bắt đầu quay , số vòng quay được tỉ lệ với A. t 2 B. t C. t 3 D. t Một vật rắn chuyển động quay quanh một trục với toạ độ góc là một hàm theo thời gian và có dạng :  t = ϕ ( rad; s ) . Tốc độ góc của vật tại thời điểm t = 2s là : A. 3 rad/s B. 6 rad/s C. 24 rad/s D. 12 rad/s Dùng một ròng rọc có dạng một đóa tròn có khối lượng không đáng kể , có bán kính R = 50cm . Dùng một dây không dãn khối lượng không đáng kể vắt qua ròng rọc . Hai đầu dây treo hai vật m 1 = 2kg , m 2 = 5kg .Mômen lực tác dụng lên ròng rọc là : A. 10N.m B. 25N.m C. 35N.m D. 15N.m $1J)G,!'PYG)&,T&p10&()0&%/*#,-& !RO&F%&/L)R!$R+1>,/\&96 Rƒc('1>,G,! A0&J1'g) C=1/ 1)` ') D?@1 ',1#,-#,& +('.&')#,2 ')F b$'.&k$&+#,- 0&!`1|'/*(R)/ &@1G(c%&&9&-F'1>,'/ A#,-& ROC#,-'3#,-?)_'g)'3D#,-&,&RO 1PN)0&()/PY1 'W1k  G4+#,-&a1'W1„&N)')F ;1PN) '?'O&-F'1'3&"!6&P[1?$0%&T , …61!)>,G*)('()*)GC)_ G4#,-*)('1 ω 0&J1'g)c%&'1=1>,1PN)'!1#$U&1PN)',1&-F '1H A† R ;  m l• ω m  C† R ;  m l ω m  † R ;   5 D† R ;  m l  •  ω     m ?$&b"?'O#,-&,&RO'3lTL1&$)1&}m#,& +('.&>,S,G0FT /7?'O#,-2(1?@1,R5G‡(1>,?$&b"G,G0FT/7?'O#,-?@1 A,R5GC,R5G,R5GD,R5G ?$&b"',1#,-*)('1,R5G&U?.&r C$&b"#,-& RO'3*)1),(1' /*,R5G]#,-'PY>,?$&b"0FT/7&r '_/7RT1&a/ A,RC,R,RD,R ?$&b"'PN10%& #,-*)1),(10&J1'g),R5G  2  ;//7?$&b"?'O#,- ]),(&P*1 >, ')F E&?$&b"k&N)')F ;G/ A 5G  C 5G   5G  D 5G   ?$&b"&.$R+1>,  J "/\  0&J1'g)cg1>, J "   J "/\ ,G$ 1)$.?@1^ 0&J1'g)c!1G'O2(1>,?$&b"?)_'g)T,R5G'_,R5G! " #$%&>,?$&b"'()*)+/ Ae;01  Ce;01  e;01  De;01  ,)0&()/PY1  ;201  ;201'PY()*)&,?@1 GY)R-&s20&J1Rr#, 41+#,-@ 1,1('.&1! …6?lU&m~41 ! "#$%&2 01  ?$0%& !)@1R-0&J1PY410&)#,-Ci#, ) ,G$89-1;2 5G   ]),(>,    /  A2 5G  C2 5G  2 5G  D2 5G   Cã 4 chÊt ®iÓm n»m däc theo trôc ox. ChÊt ®iÓm 1 cã khèi lng 2kg ë täa ®é – 2m, chÊt ®iÓm 2 cã khèi l- îng 4kg ë gèc täa ®é, chÊt ®iÓm 3 cã khèi lîng 3kg ë täa ®é – 6m, chÊt ®iÓm 4 cã khèi lîng 3kg ë täa ®é 4m. Khèi t©m cña hÖ n»m ë täa ®é A. – 0,83 m. B. – 0,72 m. C. 0,83 m. D. 0,72 m. c$R+1  J "/\;2^ / #`O'j/ &!#`O#,-&,&RO'3*)1), (1 γ ;,R5G  #,& +')#, >,#`Oˆ`O0&()/PY1 ;‰1C$0%&>,#` O1)$./ A C  D2 ?$&b"?$0%&2 2#,-TL1&$)'W1-*)1),(1 γ ;,R5G  &)3R)#h'L!>, ')F &?$&b"G,&N)1),G1)$./ A C2  D &U&+'V1&9?$0%&; 20&()/PY1 ;012',1#,-#,&+'()bW1>,*) ('114156&7<F&U&+RT1/L)G,G0FT0&)$R+1!+  J "&r </* >, J "&r / Aπ^  2π^  Cπ^  D2π^  Š #`O'j2'V1&920&()/PY12?$0%&~! "#$%&>,#`O'()*)+#,- $& #`O '!L ~  / Ae;   ~   Ce;   ~  Š e;   ~   De;   ~   ! "#$%&>, &9')F '()*) +#,-&,-'g)&_!0&)0&()/PY1>,1)` ') n,0&!`1$&T&9')F '_+#,-=1196'J)H A])` 4 6&OP C])` 4 n, ‰&J1'g) Dc=1196'J)Š c ',1#,-#,& +('.&')#,&,)')F AC‰&!`1$&TA2C*) +#,-/O/PY/cL) &N)')F 21)p,(R)l A 2 C m2('1l A2 C ω ω m1),(&P*1  l, A 2, C m>,&71 ()/)&o&PG, A A C A C A C   ‚  ‚, , ω ω = = =  C A C A C A C   ‚ ‚, , ω ω = = =   A C A C A C   ‚  ‚ ω ω γ γ = = =   D A C A C A C   ‚ ‚, , ω ω = = =  '1)&`-Ob(1P*Ci#,GW`>,0&J10&%2'L)/PY1!G,'-0&J1&,- 'g)0&)1PN)'',1&!/0&J1H Ac&_=1>,1PN) C<1=1#,->,1PN)#,&+')#, 0&()  J "#$%&>,1PN)'()*)+#,-')#,0&() DJ "'1/PY1>,1PN)'()*) 0&()  ‡&W&9#,-#,&+('.&∆   ! 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