Mgt dAu so-i diy duo-c treo o A, dAr,r kia gin vAt co lchtii phuo'ng thdng dirng vo'i chr.r ki T: 1s.. a HQ so ddn hoi cr"ra dAy.. Tin so lcira ngu6n.
Trang 1cgl{c HoA xA uqll cnu xcnia lr4r NAM
DQc l0p - Trl do - Henh Phtic
ri, uu cHeN Hgc slliH cror cAr rixu LoP t2
Mdn: Vit li - Nlm h9c.2015 - 2076 Thdi gian: 180 philt (kh6ng ke thdi gian giao d€)
Bii 1
MQt dAy cao su nhe dan h6i co chieu dd,j AB : /0 : 1ffi, cci luc ddn h6i tuAn
theo dinh iuAt lltic Mgt dAu so-i diy duo-c treo o A, dAr,r kia gin vAt co lchtii
phuo'ng thdng dirng vo'i chr.r ki T: 1s Ldy g =' 10ir/s2
1 I16y tinh:
,( , , )
a) HQ so ddn hoi cr"ra dAy.
b) Vdn toc cira vAt o'vi tri D, v6i OD : 0,05 m.
c) -lhoi
gian de vdt di ru C clcn D
2.YXm duoc nAng 10n c16n vi tri A roi duo'c thi roi tu do Tim tho'i gian 116 vAt
M quay lai vi tri A 1An thu nhdt ke tu khi vit duo'c th6.
I]iri 2
Tudi6nc6di6ndungC,cu6ndAyc6r16trrcami-vidi€ntrrr.- ]M
,i
^ ^ .-: i
-cos2rft(v) Tin so lcira ngu6n <1i€n c6 gi6 tri thay d6i dr,roc Ilo
qua di€n trcr cua cric ddy noi
1 Khi f :50Hz,I{ - 30 0 ngudi ta do duoc hi6u di6n th6 hi6u dung o hai dAu M, N Ie Liyx: 60V, cuong clQ hi€u dr"rng cua dong di6n trong mach I : 1,414A =
'E A Bi€t hieu di6n th5 tuc thd'i uvrx 16ch
phe A,25r, so vdi cuong dO Cong di6n lic riroi i vi ri,"rr 10ch pha 0,5n so vd'i u.,\s.
a) Tinh cdc giit trj r,I- C vi llo
b) Tinh c6ng suAt ti6r.r thu cira mach di6n vd vi6t bitiu thirc hi€u diqn th6 u,s,r o hai dAu tu cli6n.
2 Lan lugt co rlinh gid tri f ' 50H2, thay d6i giri tri R; roi c6 dinh.gi6 tr1 R : 300, thay d6i gi6 tri L Xdc dinh ti s6 girta cac gtittri cuc clai cua hi€u di€n th6 hi6r-r dUng o'hai ddri tU di€n trong hai trLrdng hop tr6n.
Bei 3
vcri phuong ngang (hinh 3), hC s6 ma s6t pL gifta v6t vd mat phang nghi€ng
, -; .
thay doi cung v6r su tang cira qudng duong chuy6n dQng I tinh tu'dinh theo
qr.ry hidt F = bx VAt dung lai tru6c ldri d6n chAn m4t phang nghr€ng
1 Xdc dinh vi tri cua vat khi vAt c6 vdn tdc dat gi|tri cuc dai
2 Ilay tinh tho'i gian kC tu khi vit bit diu chuydn ddng den khi dung
lai-Bni 4
M6t luong khi heii c6 the tich Zo :2t o 5p sudt po -)-ctt vd nhi€t do 0'C Ngud'i ta cho khi h61i niy dan
md khi thuc hi€n trong qu6 trinh d6 4 iAn, Tim gi6 tri cuc dai cira c6ng A md khi h€1i c6 th6 thr-rc hi6n trong quil trinh d6.
Bii 5
N€u phucmg rln thi nghiQm t16 xdc dinh di6n tr6'cua rn6t miliampe k€ Dung cu g6m: 1
1.g,"6n.di,.:: 1."*it di6n, 1 bi6n tro' c,5 th6 bi6t duo'c gi6 tri cua n6 ring vdi fr:rrg vi tri cua con chay, mot s6 di€n tro da biet gi6
tri va mot so ddy noi du dung, (dien tlo- dAy n6i khong ddng kC), m6t miliampe k€ cAn xdc dinh dl€n tro
G, ;; ;;i ;; ; )i"i,;; ;; *'i ii * u *s
UBND T1NH THAI NGUYSN
SO GIAO DUC & OAO TA.O
of csixs rrrUc
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