[r]
(1)DE rHI HKtr NAtur zott&zatz
t
trt6N :VATIJ Thbigiail 45 phfrt
rdpnNc l
Cflu l:M$t vdng-d^av c6 bin kifi R =15cm d{t trong tu trutmg ,ban dAu cim rmg tu c6 tlQ ki,n B=0, 1T .ffit phing vdng d6y vu6ng gba vu ain tluotrg glio ttr Sau kSpng thbi gian l0''s d$ {6n
cflm img ft gnm Adn 9 .tintr sudt di-€n dQng oim ri'ng xuft hi$n frong frrg dlry ? (1,5 d)
Cflu 2: IXiy so sinh cdu tgo crla kintr thi6n vfur khfc xp vi kinh hi6n vi g6tte vi khic nhau &
,hirg tli6m nio? (1 d ) .
Cflu 3: (1,5 d) ,
al Xt i ctridu tia eing dqn siq qua ling kinh c6 chi6t su6t n d{t Eong kndng [{ri voi g6c toi i bft
ki Hiy vi6t c6c c6ng thuc ling kinh ?
b/ ChiEu m$t ctrirm tia sing song songtfi I m{t b€n c0a Hng kinh dit trong litrdng khi tnryAn
sang m{t beo'ftrl'hai hdi 1u6n c6 tia 16 m{t b€n tlru kttdng? Tpi sao.?
Cflu 4: ( 1,5 d)
^t W *4" Aioi, ghu,ong vi ohiAu oua lpc tu tric dpng l€n itopn ddng ilign d}t fiong tu tutmg ddu ( phit bi6u quy tilc n€u c6 )
ti tvttt doenrOay Ofin d*i 5 om tt+t te ffi lmg dAu vt hqp vfi vdc to oem ftrg-tt *0E&;l00
Ddqg i!r6.n gu4 dty c6 ou,ong d0 0,75 A,lpc tEtr{c dgng l€n do6n dAy tlo H 3.10-'N t{nh cim tug ttrcrla tutnrang.? !t.t€ tt)
chru F -,: ( 1,5 d ) Cho mQt-ttrfir"kirih'cO
"tridt *udt U n = 1,5 vi c6 m$t mat 6i ben kinh li 30 cm ,
mQl mit 16m c6 btu ktuh li 20 cm &t,frong khdng ltri
a/ finh ti€u c1r crla th{u ktulr vi cho tti4t Aay B thdu kinh lopi gi ?
b/ n6rr dit vft s6ng AB cich th6u kinh 120 cm thi hfry xirc dinh vi ri ctu emh ?
C4u 6: ( 1,5 d ) MOt kinh hi6o vi c6 vflt kinh voi ti0u cp fi : 1,5 cm , fti kinh vrfi ti6u qr f2 = 4,5
dG-ftroang cfch gifra hai kinh 0r0z : 16 cm MOt vflt AB tlit trxio v$t k{ntr Mtt m$t hqc sinh , lrtr-Ong iO t$t o6 khoeng g1rc cfln H 25 cm khi ng8m chtng & vd qrc thi
y s6 tCIi gi6c crla kinh hi6n vi Ii bao nhi€u ?
bl ktroturg c6ch dr tirvil AB it6nv$t k{nh 0r libao nhi6u?
CfluJ: {t,J d} MOt nguiri oo ili6m cpc vi6n c6ch m"it socm
a/ M;t ngutri ney bi tflt d ? T4i ?