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(4,5 tli6m): An, Binh vd Tung cung khoi hanh fii 4 lip 8 gio Oe ei een B, vdi<br />
8 km. Do chi c6 mOt xe dap tliQn nOn An chd Binh ct6n q, r6i li6n quay lai c16n Tirng vcri<br />
cing rnQt van ti5c vr: 16 km/h. Tiong hic d6 Tung di bO den iftin B voi vfln tdcvz:4 km/h.<br />
1. H6i Tung dtin B hic m6y gid ? Qudng duong Ttlg phii iti b0 la bao nhi6u km?<br />
z.p6 An dtin B dring 9 gid, A" q6 Binh tai mQt tli6m ndo d6 rdi lap tuc quay lpi chd<br />
Tirng cung v6 B, B.inh ti6p tuc di bO ve e, Tim qudng {"ryg di 99 cta.Tirng vi cria P1"h<br />
Binh c16n B hic m6y gio ? Biet xe d4p diQn lu6n chuy6n dQng il€u vdi vQn tdc vr, nhirng<br />
ngudi di b0 lu6n di vcri vfln tdc vz.<br />
BAi 2. (4,0 di6m): C6 hai binh c6ch nhiQt, m5i Umn chr?a 3009 nu6c. Ban dAu binh 1<br />
nu6c c6 nhiQt dQ tor 55,60C vd binh 2 nuoc c6 nhi-et ttQ toz: 300C. Ldy ra 1009 nudc til<br />
binh 1 d6 sang binh 2 rOi ttru6y d€u. Khi dd cdn bing nhiQt, tu binh 2I6y ra 1009 nu6c dd<br />
sang binh t rOi ttru6y d€u. Coi ring chi c6 sg trao AOi nniet gita cdc lugng nu6c, b6 qua<br />
sg h6a hoi cria nudc vd mgi mdt m6t nhiet<br />
1. Tinh nhiet d0 cria nudc 6 binh 2 vd binh I khi cdn b5ng nhiQt vd hiQu nhiQt d0 cria<br />
nudc trons hai binh khi d6.<br />
Z. Ci AO Ai OO tai ntru ttr€ voi cirng 1009 nu6c lay.ra. Tirn sd lAn d6 tu binh 2 sang<br />
binh 1 AC frieu nhiet dQ cria nu6c trong hai binh khi cdn bdng nhipt la 0,4oC.<br />
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Bni 3. (5,5 tli6m): Cho m4ch diQn nhu hinh 1, d[t vdo hai dAu dopn mpch AB hiQu<br />
rti€n th6 khdng d6i ttae : 18 V. Bi6t: tvtN ld bii5n tro<br />
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vdi Rrrnr 20A, Rl: 3 Q, Rr :2{2. Vdn ki5 V va cAc<br />
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ampe k6 Ar, Azldli tu&ng. 86 qua diQn trO {ay dan.<br />
1-. EAt RMc: x.I.dP bi6u thirc tinh sd chi cta<br />
v6n k6 vd c6c ampe k6 theo x. 56 chi cria cdc dgng<br />
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cg tr€n thay dOi thO ndo n€u con ch4y C di chuydn tu<br />
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z.Phei dflt con ch4y C d d6u d6 c6ng su6t ti6u<br />
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thp tr6n bi6n tr& ld lon nhe? Tinh cdng suAt d6.<br />
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bing mQt v4t ddn c6 dign tr& Rp. Bi€t rdng hiqu dign th0 Up giira<br />
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Bei 4. (a.0 tli6m): Cho AB la v{t sSng<br />
vd A'B' la anh cria n6 qua th6u kinh; xy ld<br />
truc chinh cria th6u kinh (hinh 2). Bi6t:<br />
A'B':3AB;!rq: - 160cm (vi trf thti 1).<br />
1. Hay cho biiit lopi thAu kinh dd sri<br />
dUng. Fa"g c6ch vE x6c dfnh quanq tdm vd<br />
ti€u di6m chinh. Tffi ti6u cu cta thdu kinh.<br />
2. Giit vflt ci5 dinh, dfch chuyiSn th6u kinh dgc theo phucrng c3a tryc chinh, ra xa v{t<br />
th€m mQt do4n 50cm (vi tri thi 2). Tinh kho6ng c6ch tu anh tdi thdu.kffi vd qudng ducrng<br />
anh dA di chuydn trong qu6 trinh dich chuy€n thdu kinh tu v! tri thri 1 d€n vi tri thti 2.<br />
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Bni 5. (2,0 tti6m): Hay tim phucrng 6n thuc nghiQm x6c dinh ttrOi tuqng ri€ng<br />
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cfra<br />
thriy ngdn. Cho dgng cg g6m: L9 thriy tinh r6ng dri lcrn; nu6c c6 khOi luqng ri€ng D; cdn<br />
dOng h-O c6 d0 chffi x6c cao, c6 gi6i han do vd d0 chia nh6 nhat phri hqtp.<br />
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tdi liQu, cdn b0 coi thi kh1ng gidi th{ch gi thdm.<br />
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