kg chuydn oo.[r]
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rcr6m TRA Flec rY [I -NAtrt Hec 2008 -2009
mons v{r uf LoP lo ruANG cAo ; Thdi gian 60 phrit
4:
l- Dinh nghia d0ng [fcl ng cfia I vflt, vidr bidu thtfc, don vi v& phdt bidu dinh tu6t bio
toln tl$ng lrru.ng (ld).
2' Hdy ntu d{c OiCt rgng hp c0a v{t ri[n TUd6 cho bi€l phuong phrip xdc dinh rgng
t4rn c0a v{t r{n m6ng, phlng (t d)
3- Phdt bidu ttinh tu{t [Iuc (Hooke) vd Uie'n dilng'cria vgt rdn, tU rJ6 chfng minh cdng
thi?c F,nr = k Al (ld).
+' Phdt bidu tfnh lu6t Bec-nu-li (Bernoulli) Vi€-r bidu thrlc vi cho bidt dai luQng nio
h dp sudt dQng ? (l d ).
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5- Cho I thanh AB adng chdt c6 trgng ldQng F = lON vi AB = 100 cm Thanh AE c6 tfrd quay xung quanh trgc nlm hgang di qua O vdi OA = 30 cm ( nhu hinh vi; Ddu
A treo vit n{ng Pr = 30N Ed cin hing ta cdn treo tai cldu A t vf,i cri
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l6qns pz uing bao nhi€u? (l d) D
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m
E-6 4r
6 - MOt cdn ng{a k6o I chidc xe chgy vdi vfn tdc V= 14.4 km/h tr6n mQt dUdng nhrn i
ngang nidt tyc.teo F = 500N vi hQp vdi phtfong nlm ngang i g6c d = 300 Tinh '
c6ng th{c rrieh€0a nsga.mns 30 philt ? (l{ l -3_lll{?1, ?H ff) '7 -M0t thang mdy c6 khdi luqng M =600 kg chuydn oo ng th8ng/6'ftrd:leh cao-h/= l0m
(kh6ng cti ma sdt) Tinh cdng ctii dgng ctl dd kio rhin4 nriiy l0rr troirg trrdtrrg lrr.tir.r: l a) Thang mdy di l€n thing d€u/ A= 60,tCt2fi 1 , i
b) Thang mdy di l6n nhanh ddn ddu vrJi a f rnls: cnY{= l0m/s! ( ld) e{ Cllli
8- M$t vi6n b'i cd kh0'i luQng I kg thi roi til dinh m|t phdng nghi€ng cao 20 crn
a) Ap dqng dinh luflt b6o toin cd nf,ng fim vfin^tdc cfia vi€n bi 6 chdn ddc? Eiet ring lgc ma sdt tr€n ddc ttrOng dr{ng kd? VB
= 2 (r/r)
, c) ,Khi ttdn chln ddc vi6n bi tidp tgc chuy?n dQng'd6n mflt ngang drr{c I m nii'a t6t
^d:ff liir, * ,o"r?lc ,,m4 siit tr6n mrr ngang tdc dpng vio vi6n bi ? (, rd)
9) Cd 0,l.mol khi d rip su{t Pr =2't^ nhiQt d0 tr - 00 c, thd tfch Vr = lJ1lit lim cho
khi ndng lOn nhi€t dQ t2 = l02p C vi giil nguy€n ttrd fch khdi khi
a) frnh ap
'riiir r
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b)vetr€nttdthiP-Vcria{uititnt'.iayt.trol,,
l0) C6 t2 grarn khf chidm thd tfch lit d nhi€t dO 0C Sau khi nung ndng d8ng rip cir
khdiltrgngri6ngcfrakhil,2gl|.firnnhiqtd0khisaukhinungtltirtg ,(ld).f-},,,; sau khi nung ntirrg.l r I dr
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