Ve do thi bieu dien su phu thuge eua khoang each giua hai van dong vien vao thoi gian, tinh tu lue nguoi thu nhdt xudt phat toi lue ngudi thu hai v6 toi dieh.. Sau khi can bSng nhiet th[r]
(1)so GIAO Dye VA DAG TAG KI THI CHQN HQC SINK GIOI LOT CAP THANH PHO HANOI NAM HQC 2016 - 2017
DE CHINH THUC
Ml cit Hinhl
Mon: VAT LI Ngay thi: 25/3/2077
Th6i gian lam bai: 750 phut (De thi gom 02 trang) Bai I (4 diim)
Hai van dong vien luyen tap mon phoi hop gom chay tren duong bSng, boi tren biSn va chay tren cat voi nhung doan duong thang s = 1200m (hinh 1) Hai
nguoi c6 gSng tri cung mot t6c dg khong doi ung ^ufrng bing voi m6i ngi dung Toe di ehuyen eua eae van dong
vien tren duong bang, tren bien va tren eat tuong ung la 8m/s, 4m/s va 5m/s Ban dau, hai nguoi eung dung
vaeh xuSt phat, van dong vien thu nhat bSt dau chay som hon van dong vien thu hai phut K h i ve toi dfeh, van dong vien thu nhat dung vaeh dieh de dgi van dong vien thu
1 Tinh thoi gian hoan bai tap eua moi van dong vien
2 Tinh khoang each Ion nhdt giua van dong vien qua trinh van dong
3 Ve thi bieu dien su phu thuge eua khoang each giua hai van dong vien vao thoi gian, tinh tu lue nguoi thu nhdt xudt phat toi lue ngudi thu hai v6 toi dieh
(4 diim)
1 Nhung qua eau bang dong eo khoi lugng m nhiet 27°C vao mot nhiet lugng k l ehua nude nhiet SO'^C Sau can bSng nhiet thi nhiet eua nude la 42°C Thue hien thi nghiem tuong tu vdi mot qua eau bang kim loai khae khoi lugng m d 27°C thi nhiet dg eua nude sau can bang nhiet la 37,3°C Tim kim loai da dung thi nghiem tren, biet nhiet dung rieng eua mot so kim loai duge eho d bang dudi Bo qua su trao doi nhiet vdi moi trudng
Vat lieu Chi Dong Nhdm Thep
Nhiet dung rieng (J/kg.dg) 130 380 880 460
2 Giai thieh tai mot gigt nude sol ed the tao mot vet bong tren da nhung mot gigt nen ndng chay thi khong ?
Wsixlll (6 diim) ^ ^ 1^
1 Cho maeh dien nhu hinh 2: nguon dien eo hieu dien thi U ' khong doi; eae dien trd R i = 3Q, R2 = 2Q, biln trd ed dien trd toan
phln la Rb = 1OQ; dien trd eua day ndi va eae ampe k l khong dang (j\
k l Xae dinh vi tri eon chay C eho: ^ a Ampe ke A3 ehi s6 khong
b Hai ampe k l A i , A2 ehi eung gia tri e Hai ampe k l Aj, A3 ehi eung gia tri
2 Cho ba bong den gilng nhau, khda K eung vdi day dan eo dien trd khong dang ke ghep mot maeh dien Mde maeh dign vao nguon dien ed hieu dien thi U khong ddi Ta thiy:
- Khi hai khoa K eung dong thi den sang hinh thudng; - Khi hai khda K eung md thi den sang yeu nhu
Hay ve maeh dien tren va nhan xet ve sang eua eae den mgt khda K dong, mgt khda K md
(2)Bai iy(6 diim)
1 Trong thi nghiem nguon S phat tia sang manh chieu qua mot thau kinh mong L c6 quang tam O, ngudi ta thu duge hinh ve eua tia sang di qua diim I nhu hinh
a L la thau kinh gi ? Hay giai thieh
b Cho SO - 16em, a = 36°52' va = 116'^34' Tim tieu eu eua L
P
, / t «
L Hinh 2. Dat vat sang phang vuong goe vdi true ehinh eua
thau kinh hoi tg Oi thi thu duge anh hien ro net tren man eac glp doi vat Bilt khoang eaeh giOa vat va man la 45em
a Ve hinh, tim tieu eu eua Oi
b Dat thau kinh O2 dong true va gan thau kinh Oj Ta thay, ehilu ehum sang song song vdi true ehinh qua quang he thi thu duge ehum tia Id eung song song nhung be rong ehi eon mgt nua Tim khoang eaeh gida hai thau kinh
- H i t Luu y: Can bp coi thi khong giai thieh gi them
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