tl^.ng luang tCr trifcfng cure dai bkng nang Itfong dien tCr cua mach dao dong.. Nang Itfofng dien tii cua mach dao dong bkng tong nang liigfng dien tnfcfng tap trung cf tu dien va nang
Trang 1A tl^.ng luang tCr trifcfng cure dai bkng nang Itfong dien tCr cua mach
dao dong
B Nang Itfcfng dien trtf&ng va nang Itftfng tCr tnfong bien t h i e n dieu hoa vdfi t a n so bSng mot nijfa t a n so cua ctfcfng do dong dien trong mach
C K h i nSng lifcfng dien trtfcrng giam t h i nang liitfng tCr trifcrng tang
D Nang Itfofng dien tii cua mach dao dong bkng tong nang liigfng dien
tnfcfng tap trung cf tu dien va nang li/cfng tCr tnicfng tap trung cf cugn cam
Giai
V i nang lifcfng dien triicfng va nSng Itfofng tCf triXdfng bien t h i e n dieu hoa v6i chu k i bang mot nufa chu k i cifcfng do dong dien trong mach nen tan so cua no phai gap doi t a n so cua cifdfng do dong dien trong mach
Vdy chqn dap an B
A cung ban chat v6i song v6 tuyen
B cung ban chat vdfi song am
C dien tich am
D btfdfc song Idfn hcfn biTdfc song cua t i a hong ngoai
Giai
Tia Rcfnghen la bufc xa dien tii nen khong mang dien, c6 cung ban
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 phan r a t h a n h h a t n h a n B c6 khoi lifong ms va h a t a c6 k h o i lucfng m„ T i so giOfa dong nang cua hat n h a n B va dong nang cua hat a ngay sau phan r a bkng:
c
Giai
Ap dung d i n h luat bao toan dong liJcfng cho h a t dang dufng yen, ta
c6: m B V B = 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 ngay sau phan ra l a : ^ =
-Vdy chqn dap an D
Giai Chi tiet de thi T S B H , C D M6n Vat II