4 1 0 * . T ru b a n in g k e n g q is m id a su v n in g o q is h tezlig i
10 m /s. U ning diam etri keng qism iga qaraganda 4 m arta kichik
boMgan q ism id a suvning o q ish tezligi q an d a y boMadi?
5 - A . P . R i m k e v i c h
6 5
7 3 - ra sm .
7 4 - rasm .
4 1 1 * . T u p ro q s o ‘rgich m ash in a b ir so a td a 500 m 3 tu p ro q
to rtib c h iq a r a d i. S uv b ila n a ra la s h g a n tu p r o q n in g h ajm i
tu p ro q n in g h a jm id a n 10 m a rta k atta. D iam etri 0,6 m boMgan
q u v u rd a suv b ilan aralash g an tu p ro q n in g h a rak atlan ish tezligi
q a n d a y boMadi?
4 1 2 * . A g ar c h a n g y u tk ic h n in g c h iq ish tesh ig ig a sh lan g
ulab, shu sh lan g n in g havo oq im i ch iq ay o tg a n ik k in ch i u chiga
stol tennisi koptogini q o ‘ysak (7 3 - rasm ), u n d a koptok m uallaq
koMarilib tu ra d i va shlan g n i h a ra k a tla n tirsa k , k o p to k h a m u
b ilan b irga h a ra k a tla n a d i. Bu h o d isa n i tu sh u n tirin g . A gar
c h a n g y u tk ic h n in g h a v o b e rish i 20 £ , sh la n g n in g ch iq ish
tesh ig in in g d ia m e tri 3 sm boMsa, h av o n in g sh lan g d an chiqish
tezligini hisoblang. Iloji boMsa, tajribani bajaring va c h a n g y u t-
kich p asportidagi m a lu m o tla rg a k o ‘ra h av o o q im i tezligini
to p in g .
4 1 3 * . V o d o p ro v o d quv uri tesh ilib , u n d a kesim i 4 m m 2
boMgan tesh ik hosil boMdi. S hu tesh ik d an suv yuqoriga vertikal
o tilib ch iq ib , 80 sm b alan d lik k a koM arilm oqda. B ir su tk ad a
q a n c h a suv o q ib ketadi?
4 1 4 * . O d a m y u rag in in g b ir su tk a dav o m id ag i o ‘rta c h a
ishlashi (tin c h h o la td a boMgani va jism o n iy ish bajargandagisi
hisobga o lin g an d a) q uyidagicha: y urak b ir siqilganda c h iq a -
rayotgan q o n n in g hajm i 90 m l; b ir siqilish d a v o m id a yurak
bajarad ig an ish 1 J; a o rta (q o n to m ir)n in g d ia m e tri 20 m m ;
a o rta d a q o n n in g h a rak atlan ish tezligi 35 sm /s. Y urak b ir su t
kad a ch iq a ra y o tg a n (oM kazayotgan) q o n h a jm in i, yurak n in g
b ir sutkadagi ishini, y u ra k n in g o ‘rta c h a q u w a tin i hisoblab
to p in g .
66
75 - rasm .
7 6 - rasm .
4 1 5 * . A g ar A n a y c h a o rq ali h av o puflasak (7 4 - rasm ),
u n d ag i h av o n in g b iro r tezligida В n a y c h a d a suv k o ‘tarilad i,
С n a y c h a d a n esa h av o p u fa k -p u fa k boMib ch iq a d i. H o d isan i
tu sh u n tirin g .
4 1 6 * . N im a u c h u n yengil q o g ‘o z silin d r qiya tek islik d an
d u m a la b tu sh ib A В p a ra b o la (7 5 - ra sm ) b o ‘y ich a h a ra k a t-
la n m a y , qiya tek islik n in g asosiga o g ‘adi?
4 1 7 * . 7 6 - ra sm d a futbo l m ay d o n i b ir q ism in in g chizm asi
k o ‘rsatilgan. T o ‘p sh am o lsiz h av o d a M N d arvozaga tushishi
u c h u n d arv o za c h iz ig ld a g i A n u q ta d a n to ‘p tep ay o tg a n d a
un i q an d a y y o ‘n alish d a ay lan tirish lozim ?
67
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