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8 . N yu ton n in g ikkinchi qonuni.
N yu ton n in g uchinchi q onu n i1
1 2 6 . Ilg ag id a g i to r tis h k u c h i 15 k N boM gan tr a k to r
tirk a m a g a 0,5 m /s 2 tezla n ish b erad i. T o rtish kuchi 60 kN ga
y etad ig a n tra k to r o ‘sh a tirk am ag a q a n d a y tezla n ish beradi?
127. 60 N k u c h jism g a 0,8 m /s 2 te z la n ish b eradi. Q a n d ay
k u c h bu jism g a 2 m /s 2 tezla n ish b erad i?
128. M assasi 4 kg boMgan jism b iro r k u c h t a ’siri o stida
2 m /s 2 tezla n ish oldi. S h u n d ay k u ch t a ’siri o stid a m assasi
10 kg boMgan jism q an d a y tezla n ish oladi?
129. M assasi 4 t boMgan y u k o rtilm a g a n (b o ‘sh ) yuk
avtom obili 0,3 m /s 2 tezlanish bilan h arak atlan a boshladi. Agar
av to m o b il o ‘sh a to rtish k u c h id a jo y id a n 0,2 m /s 2 tezla n ish
bilan q o ‘zg‘alsa, avtom obilga ortilgan yukning massasi qanday?
130. A g ar reaktiv sam o ly o t d v ig atelin in g to rtis h ku chi
90 kN boMsa, m assasi 60 t boMgan sam o ly o t tezlik olish
v aq tid a q a n d a y tezlan ish bilan h arak atlan g a n ?
131. Yengil av to m o b iln in g m assasi 2 1, yuk avtom obiliniki
8 t. Y uk a v to m o b ilin in g to rtish k u ch i yengil avtom o b iln ik ig a
q ara g a n d a 2 m a rta k a tta boMsa, av to m o b illa rn in g te z la n ish
larin i taqqoslang.
132. M assasi 0,5 kg boMgan k o p to k k a 0,02 s d av o m id a
zarb berilgandan keyin u 10 m /s tezlik oladi. Z arb n in g o ‘rtacha
ku ch in i to p in g .
1 B u p a ra g r a fd a g i m a s a la la r d a k u c h la r n i o ‘z g a r m a s d e b h is o b la n g ,
is h q a la n is h n i e s a , a g a r a lo h i d a a y tilm a g a n boM sa, h is o b g a o lm a n g .
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133. Y uk m ashinasi yuk ortilm agan tirkamaga я, = 0,4 m /s2,
yuk o rtilg an tirk am ag a esa я 2 = 0,1 m /s 2 te z la n ish b eradi. B ir-
biriga ulangan bu tirkam alarga yuk m ashinasi q an d ay tezlanish
b erad i? Y uk m ash in asin in g to rtish k u ch in i h a m m a h o llard a
h a m b ir xil d eb hisoblang.
134. A rav ach a b iro r k u ch t a ’siri o stid a tin c h h o la tid a n
b oshlab h a ra k a tla n ib 40 sm y o ‘l o ‘td i. A ravachaga 200 g yuk
q o ‘yilganda esa o ‘sha kuch ta ’siri ostida o ‘sha vaqt ichida tinch
h o la tid a n 20 sm y o ‘l o ‘tdi. A ra v ach a n in g m assasi q anday?
135. 2 5 - ra sm d a m assasi 2 kg b o i g a n jism tezlig in in g
o ‘zgarish grafigi berilgan. H a ra k a tn in g h a r b ir b o sq ic h id a
jism ga t a ’sir etayotgan k u ch n in g proyeksiyasi ( Д х ) ) ni toping.
136. O .G e rik e n in g (16 54 - y.) atm o sfe ra b o sim in i o ‘rg a-
nishga d o ir M agdeburg y arim sh arlari b ilan o ‘tk azg a n m a sh -
h u r tajrib alarid a havosi s o ‘rib o lin g an ikkita y a rim sh arn i b ir-
b ir id a n a jr a tis h u c h u n 16 ta o t q o ‘s h ilg a n ( h a r q a y si
yarim sh arg a 8 ta d a n o t). S u n d a y tajrib an i k a m ro q o t bilan
h a m o ‘tk azsa boM adimi?
137. S h ta n g ach i sh tan g an i k o ‘k rag ida tu tib tu rib , s o ‘ngra
y u q o rig a k o ‘ta ra y o tg a n d a g i ta x ta su p ag a b o sim k u c h in i u
sh tan g an i h a ra k a tla n tirm a y k o ‘ta rib tu rg an d a g i bosim kuchi
b ilan taq q o slan g . S h ta n g a a w a l te z la n u v c h a n , s o ‘n g ra b iro r
vaqt tekis va nih o y at sek in lan u v ch an h arak at qiladi d eb h iso b
lang.
1 3 8 . K o s m ik k e m a e r k in u c h a y o tg a n d a k o s m o n a v t
q o ‘lidan m assiv b u y u m n i q o ‘yib yubo rsa (ita rm a y yoki tu rtib
y u b o rm a y ), k o sm o n av tg a n im a b o ‘lad i? A g ar u b u y u m n i
o tib y u b o rsa -ch i?
139. N im a u c h u n q ay iq d a tu rg an o d a m b o rtg a bo sg an id a
q ayiq jo y id a n q o ‘zg‘alm ay d i, ag ar o d a m q a y iq d a n q irg ‘o q q a
c h iq ay o tg a n d a sh u n d ay kuch b ilan un i itarsa, qayiq h arakatga
keladi?
1 4 0 . B a ro n M y u n x a u z e n o ‘z i n i - o ‘z i s o c h id a n to rtib
b otq o q d an chiqarganini ta ’kidlaydi. Buning m u m k in em asligini
asoslab be ring.
141. A gar ipni uzaytirib, q a d o q to sh suvli id ish n in g tubiga
te g m a y d ig a n q ilib su v g a b u tu n la y b o tir ils a ( 2 6 - r a s m ) ,
ta ro z in in g m u v o zan a ti buzilad im i? A gar ip n i kesib y u b o rib ,
q a d o q tosh idish tubiga tu sh irilsa -c h i?
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и, m /s
2 5 - rasm .
2 6 - rasm .
2 7 - rasm .
2 8 - rasm .
142.
A g ar 2 7 - ra sm d a k o ‘rsa tilg an d in a m o m e trla rn in g
y u q o rid ag isin i pastga sh u n d a y tu sh irsa k k i, hajm i 0 ,2 d m 3
boMgan yuk id ish n in g tubiga teg m ay suvga b u tu n la y bo tsa,
d in a m o m e trla r q a n c h a d a n k u c h n i k o ‘rsatadi?
143*. T aro z in in g b ir p allasida suvli idish, b o sh q a p alla-
sida esa sh tativ va u n g a osilgan 54 g m assali a lu m in iy jism
b o r, b u n d a ta ro z i m u v o z a n a td a tu rib d i (28- rasm ). A gar ip
ni u za y tirib , to sh (jism ) suvga b o tirilsa , m u v o zan a t buziladi.
M u v o za n atn i tiklash u c h u n ta ro z in in g o ‘ng pallasiga q a n c h a
yuk q o ‘yish kerak?
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