THÔNG TIN TÀI LIỆU
A tl^.ng luang tCr trifcfng cure dai b k n g n a n g Itfong d i e n tCr cua mach dao dong B N a n g Itfcfng dien trtf&ng va n a n g Itftfng tCr t n f o n g b i e n t h i e n dieu hoa vdfi t a n so bSng mot nijfa t a n so cua ctfcfng dong dien t r o n g mach C K h i nSng lifcfng dien trtfcrng g i a m t h i n a n g liitfng tCr trifcrng t a n g D Nang Itfofng dien tii cua mach dao dong bkng tong nang liigfng dien tnfcfng tap trung cf t u dien va nang li/cfng tCr tnicfng tap trung cf cugn cam Giai V i n a n g lifcfng dien triicfng va nSng Itfofng tCf triXdfng b i e n t h i e n dieu hoa v6i chu k i bang mot nufa chu k i cifcfng dong dien t r o n g mach nen tan so cua no p h a i gap doi t a n so cua cifdfng dong dien t r o n g mach Vdy chqn dap an B Cdu 7: T i a Rcfnghen c6 A cung b a n chat v i song v6 tuyen B cung ban chat vdfi song a m C dien t i c h a m D btfdfc song Idfn hcfn biTdfc song cua t i a h o n g ngoai Giai T i a Rcfnghen la bufc xa dien tii n e n k h o n g m a n g d i e n , c6 cung b a n chat vdfi song v6 tuyen va c6 bildfc song nho hofn biidfc song cua t i a hong ngoai Vdy chon dap an A Cdu 8: H a t n h a n A dang dufng yen t h i p h a n r a t h a n h h a t n h a n B c6 k h o i lifong ms va h a t a c6 k h o i lucfng m„ T i so giOfa dong n a n g cua h a t n h a n B va dong n a n g cua h a t a sau p h a n r a b k n g : A ^ c B m„ D ^ Giai Ap dung d i n h l u a t bao toan dong liJcfng cho h a t dang dufng y e n , t a c6: mBVB = m„v„ T i so giufa dong n&ng cua h a t n h a n B va dong nSng cua h a t a sau p h a n r a l a : ^ Vdy chqn dap an D Giai Chi tiet de thi T S B H , C D M6n Vat II = -
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