Fizika (12.10.2024)

45 ta savol · saqlash uchun kiring

Fizika formulalar varaqasi / Лист формул по физике

Doimiy fizik kattaliklar / Физические постоянные

Kattalik	Qiymati
Erkin tushish tezlanishi	$g \approx 10\ \text{m/s}^2$
Gravitatsiya doimiysi	$G = \frac{20}{3}\cdot10^{-11}\ \frac{\text{N}\cdot\text{m}^2}{\text{kg}^2}$
Universal gaz doimiysi	$R = 8{,}31\ \text{J/(mol}\cdot\text{K)}$
Bolsman doimiysi	$k = 1{,}38\cdot10^{-23}\ \text{J/K}$
Avogadro soni	$N_A = 6\cdot10^{23}\ \text{mol}^{-1}$
Elementar zaryad	$e = 1{,}6\cdot10^{-19}\ \text{C}$

Kattalik	Qiymati
Kulon qonuni koeffitsiyenti	$k = 9\cdot10^{9}\ \frac{\text{N}\cdot\text{m}^2}{\text{C}^2}$
Elektr doimiysi	$\varepsilon_0 = 8{,}85\cdot10^{-12}\ \frac{\text{F}}{\text{m}}$
Magnit doimiysi	$\mu_0 = 4\pi\cdot10^{-7}\ \text{N/A}^2$
Yorug'likning vakuumdagi tezligi	$c = 3\cdot10^{8}\ \text{m/s}$
Plank doimiysi	$h = 4{,}125\cdot10^{-15}\ \text{eV}\cdot\text{s}$
Plank doimiysi	$h = 6{,}6\cdot10^{-34}\ \text{J}\cdot\text{s}$

O'nli old qo'shimchalar / Десятичные приставки

Old qo'shimcha	Ko'paytuvchi
T — tera	$10^{12}$
G — giga	$10^{9}$
M — mega	$10^{6}$
k — kilo	$10^{3}$
d — detsi	$10^{-1}$

Old qo'shimcha	Ko'paytuvchi
c — santi	$10^{-2}$
m — milli	$10^{-3}$
$\mu$ — mikro	$10^{-6}$
n — nano	$10^{-9}$
p — piko	$10^{-12}$

Mexanika / Механика

v=\frac{\Delta S}{\Delta t};\quad a=\frac{\Delta v}{\Delta t};\quad S=v_0t+\frac{at^2}{2};\quad \omega=\frac{\Delta\varphi}{\Delta t};\quad \varepsilon=\frac{\Delta\omega}{\Delta t};\quad \varphi=\omega_0t+\frac{\varepsilon t^2}{2};

\omega=2\pi\nu;\quad v=\omega r;\quad \nu\cdot T=1;\quad v=v_0\pm gt;\quad h=v_0t\pm\frac{gt^2}{2};

v_{0x}=v_0\cos\alpha;\quad v_{0y}=v_0\sin\alpha;\quad t_u=\frac{2v_{0y}}{g};\quad h_{max}=\frac{v_{0y}^2}{2g};\quad S=v_{0x}\cdot t_u;

\vec{a}=\vec{a}_\tau+\vec{a}_n;\quad a_n=\frac{v^2}{r};\quad m=\rho V;\quad \vec{a}=\frac{\vec{F}}{m};\quad \vec{F}_1=-\vec{F}_2;\quad F_{el}=-k\Delta\ell;

a=g(\sin\alpha\pm\mu\cos\alpha);\quad \vec{p}=m\vec{v};\quad \vec{F}\Delta t=\Delta\vec{p};\quad E_k=\frac{mv^2}{2};

M=F\ell;\quad F_1\ell_1=F_2\ell_2;\quad F_{ish}=\mu N;\quad N=\frac{A}{t}=\vec{F}\vec{v};

A=FS\cos\alpha;\quad E_p=mgh;\quad E_k+E_p=\text{const};\quad \vec{P}=m(\vec{g}-\vec{a});

g=\frac{GM}{R^2};\quad v_1=\sqrt{gR};\quad v_2=\sqrt{2gR};\quad x=A\cdot\sin(\omega t+\varphi_0);\quad v=\sqrt{\frac{T}{\rho_{ch}}};

v=\sqrt{\frac{E}{\rho}};\quad \omega=\sqrt{\frac{k}{m}};\quad T=2\pi\sqrt{\frac{m}{k}};\quad \omega=\sqrt{\frac{g}{\ell}};\quad T=2\pi\sqrt{\frac{\ell}{g}};\quad \Delta\ell=\ell-\ell_0;

\varepsilon=\frac{\Delta\ell}{\ell_0};\quad k=\frac{ES}{\ell_0};\quad F_A=\rho_sV_bg;\quad p=\rho gh;\quad S_1v_1=S_2v_2;

V_b=\frac{\rho_jV_j}{\rho_s};\quad p+\rho gh+\frac{\rho v^2}{2}=\text{const}.

Molekulyar fizika / Молекулярная физика

\nu=\frac{N}{N_A}=\frac{m}{M};\quad n=\frac{N}{V};\quad d=\sqrt[3]{\frac{VM}{mN_A}};\quad \rho=nm_0;

p=\frac{2}{3}n\bar{E}_k=\frac{1}{3}\rho\bar{v}^2=nkT;\quad \bar{E}_k=\frac{m_0\bar{v}^2}{2}=\frac{3}{2}kT;

\bar{v}=\sqrt{\frac{3RT}{M}}=\sqrt{\frac{3kT}{m_0}};\quad T=t+273;

pV=\nu RT;\quad p=\frac{\rho}{M}RT;\quad \frac{pV}{T}=\text{const};\quad Q=\Delta U+A;

A=p\Delta V;\quad \Delta U=\frac{3}{2}(p_2V_2-p_1V_1)=\frac{3}{2}\nu RT;\quad C=\frac{Q}{T_2-T_1};

c=\frac{Q}{m(T_2-T_1)};\quad \lambda=\frac{Q}{m};\quad r=\frac{Q}{m};\quad q=\frac{Q}{m};

\eta=\frac{Q_1-Q_2}{Q_1}\cdot100\ \%=\frac{T_1-T_2}{T_1}\cdot100\ \%;\quad F=\sigma l;

\sigma=\frac{F}{S};\quad \sigma=E|\varepsilon|;\quad W=\sigma S;\quad h=\frac{2\sigma}{\rho gr};\quad \Delta p=\frac{2\sigma}{R};

\rho=\frac{m}{V};\quad \varphi=\frac{\rho}{\rho_0}\cdot100\ \%=\frac{p}{p_0}\cdot100\ \%.

Elektr va magnetizm / Электричество и магнетизм

F=\frac{k|qQ|}{\varepsilon r^2};\quad E=\frac{k|Q|}{\varepsilon r^2};\quad F=qE;\quad \varphi=\frac{kQ}{\varepsilon r};\quad W_p=q\varphi;

E=\frac{\varphi_1-\varphi_2}{d};\quad A=q(\varphi_1-\varphi_2);\quad W_{el}=\frac{qU}{2};\quad C=\frac{\varepsilon\varepsilon_0S}{d};\quad q=CU;

W=\frac{\varepsilon\varepsilon_0E^2}{2};\quad C_p=C_1+C_2+\cdots+C_N;\quad \frac{1}{C_{k-k}}=\frac{1}{C_1}+\frac{1}{C_2}+\cdots+\frac{1}{C_N};

E=\frac{U}{d}=\frac{\sigma}{\varepsilon\varepsilon_0};\quad I=\frac{U}{R};\quad Q=I^2Rt;\quad P=IU;\quad I=ne\bar{v}S;\quad j=\frac{I}{S};

q=It;\quad E=\rho j;\quad R=\frac{\rho l}{S};\quad R=R_0(1+\alpha\Delta t);\quad R_{k-k}=R_1+R_2+\cdots+R_N;

\frac{1}{R_p}=\frac{1}{R_1}+\frac{1}{R_2}+\cdots+\frac{1}{R_N};\quad \mathcal{E}=\frac{A_{chet}}{q};\quad I=\frac{\mathcal{E}}{R+r};\quad \eta=\frac{R}{R+r}=\frac{U}{\mathcal{E}};

I_a=kU^{\frac{3}{2}};\quad T=2\pi\sqrt{LC};\quad \omega=\frac{1}{\sqrt{LC}};\quad W=\frac{q^2}{2C}+\frac{LI^2}{2};

Z=\sqrt{R^2+\left(\omega L-\frac{1}{\omega C}\right)^2};\quad I=\frac{U}{Z};\quad \cos\varphi=\frac{R}{Z};\quad P=I^2R=IU\cos\varphi;

I=\frac{I_0}{\sqrt{2}};\quad U=\frac{U_0}{\sqrt{2}};\quad B=\frac{\mu_0I}{2\pi R};\quad B=\frac{\mu_0I}{2R};\quad F=\frac{\mu\mu_0I_1I_2}{2\pi d}l;

F_A=BIl\sin\alpha;\quad F_L=qvB\sin\alpha;\quad R=\frac{mv}{qB};\quad T=\frac{2\pi m}{qB};\quad \omega=\frac{qB}{m};

\Phi=NBS\cos\alpha;\quad \Phi=LI;\quad W=\frac{\Phi I}{2}=\frac{LI^2}{2};\quad \mathcal{E}=-\frac{\Delta\Phi}{\Delta t}=-L\frac{\Delta I}{\Delta t}.

Optika, kvant, atom va yadro fizikasi. Nisbiylik nazariyasi

n=\frac{c}{v}=\sqrt{\varepsilon\mu};\quad \frac{\sin\alpha}{\sin\beta}=\frac{n_2}{n_1};\quad \pm\frac{1}{F}=\frac{1}{d}\pm\frac{1}{f};\quad D=\pm\frac{1}{F};

k=\frac{f}{d};\quad \frac{1}{F}=\left(\frac{n_l}{n_m}-1\right)\left(\pm\frac{1}{R_1}\pm\frac{1}{R_2}\right);\quad I=\frac{P}{S}=\mathcal{W}v;\quad I\sim\omega^4;

d\sin\varphi=k\lambda;\quad \lambda_m=\frac{b}{T};\quad I=\frac{I_0}{2};\quad I=I_0\cos^2\alpha;\quad I=\frac{\Phi}{\Omega};

E=\frac{\Phi}{S}=\frac{I}{R^2}\cos\varphi;\quad E=h\nu;\quad p=\frac{h\nu}{c}=\frac{h}{\lambda};\quad I=\frac{N}{S\cdot t}h\nu;

h\nu=A_{ch}+E_k^{max};\quad E_k^{max}=eU_{yop};\quad h\nu_{min}=\frac{hc}{\lambda_{max}}=A_{ch};

E_n=\frac{E_1}{n^2};\quad E_1=-13{,}6\ eV;\quad h\nu=E_n-E_m;\quad m_ev_nr_n=n\hbar;

r_n=n^2r_B;\quad v_n=\frac{v_1}{n};\quad E_{bog'}=\Delta mc^2;\quad E_{sol}=\frac{E_{bog'}}{A};

A=-\frac{dN}{dt};\quad N=N_0e^{-\lambda t}=N_0 2^{-\frac{t}{T}};\quad \lambda T=\ln 2\approx0{,}7;

\tau=\frac{\tau_0}{\sqrt{1-\frac{v^2}{c^2}}};\quad l=l_0\sqrt{1-\frac{v^2}{c^2}};\quad \rho=\frac{\rho_0}{1-\frac{v^2}{c^2}};\quad v=\frac{v_1+v_2}{1\pm\frac{v_1v_2}{c^2}};

m=\frac{m_0}{\sqrt{1-\frac{v^2}{c^2}}};\quad E_0=m_0c^2;\quad E=mc^2;\quad \vec{p}=m\vec{v};

E_k=(m-m_0)c^2;\quad E^2-c^2p^2=m_0^2c^4.

Moddalar va ularning xossalari / Вещества и их свойства

Zichlik (kg/m

^3

) / Плотность

Modda	Zichlik
benzin	700
kerosin	800
suv (4 °C)	1000
spirt	800
simob	13600

Modda	Zichlik
alyuminiy	2700
muz	900
mis	8900
po'lat	7800
temir	7800

Solishtirma issiqlik sig'imi (J/(kg·K)) / Удельная теплоёмкость

Modda	Qiymat
alyuminiy	900
mis	380
muz	2100
oltin	120

Modda	Qiymat
rux	400
suv	4200
temir	450
cho'yan	500

Molyar massa (g/mol) / Молярная масса

Modda	M
argon (Ar)	40
azot ( $N_2$ )	28
geliy (He)	4
neon (Ne)	20
havo	29
suv ( $H_2O$ )	18

Modda	M
karbonad angidrid ( $CO_2$ )	44
mis (Cu)	64
alyuminiy (Al)	27
kislorod ( $O_2$ )	32
vodorod ( $H_2$ )	2

Boshqa kattaliklar

Kattalik	Qiymat
Muzning solishtirma erish issiqligi (0 °C)	$330\cdot10^{3}\ \text{J/kg}$
Suvning solishtirma bug'lanish issiqligi (100 °C)	$2{,}3\cdot10^{6}\ \text{J/kg}$
Benzinning yonish issiqligi	$46\cdot10^{6}\ \text{J/kg}$
Neftning yonish issiqligi	$44\cdot10^{6}\ \text{J/kg}$

Kattalik	Qiymat
Spirtning yonish issiqligi	$29\cdot10^{6}\ \text{J/kg}$
Tabiiy gazning yonish issiqligi	$44\cdot10^{6}\ \text{J/kg}$
Toshko'mirning yonish issiqligi	$29\cdot10^{6}\ \text{J/kg}$
Yog'ochning yonish issiqligi	$10\cdot10^{6}\ \text{J/kg}$

Sirt taranglik koeffitsiyenti (20 °C),

10^{-3}

N/m

Modda	Qiymat
benzin	21
kerosin	24
suv	73
spirt	22
sovun eritmasi	40
simob	510

O'tkazgichlarning solishtirma qarshiligi (20 °C),

10^{-8}\\ \\Omega\\cdot

Modda	Qiymat
mis	1,7
alyuminiy	2,8
volfram	5,5
temir	9,8
nikelin	40
nixrom	110

Nur sindirish ko'rsatkichi / Показатель преломления

Modda	n
suv	$4/3$
shisha	1,5
yoqut	1,76
olmos	2,42

Ayrim birliklar o'rtasidagi munosabat va normal sharoit

Munosabat	Qiymat
0 °C	$273\ \text{K}$
1 u	$1{,}66\cdot10^{-27}\ \text{kg}$
1 eV	$1{,}6\cdot10^{-19}\ \text{J}$
1 mm Hg	$133{,}3\ \text{Pa}$
Normal bosim	$10^{5}\ \text{Pa}$
Normal temperatura	$0\ ^\circ\text{C}$

Shartli belgilar / Условные обозначения

× ×— magnit induksiya chiziqlari o'quvchidan qog'oz tekisligiga tik yo'nalgan
• •— magnit induksiya chiziqlari qog'oz tekisligidan o'quvchiga tik yo'nalgan
⊕— o'tkazgichdagi tok o'quvchidan qog'oz tekisligiga tik yo'nalgan
⊙— o'tkazgichdagi tok qog'oz tekisligidan o'quvchiga tik yo'nalgan

Eslatma: bu formulalar yordam sifatida tavsiya qilinadi.

30 m/s tezlik bilan harakatlanayotgan avtomobil 18 km masofani necha minutda bosib o'tadi?

Rasmda ko'rsatilgan suv bilan to'ldirilgan sisterna o'ng tomonga tezlanish bilan harakat qilsa, sisterna ichidagi plastik idish qaysi tomonga og'adi?

Bolalar lagerdan qaytishda avtobus 70 km/h o'zgarmas tezlik bilan harakat qilmoqda. Yo'lda havo o'zgarib yomg'ir yog'ishni boshladi va avtobus 50 km/h tezlik bilan harakatlandi. Avtobus manzilga belgilangan vaqtdan 10 minut kechikib yetib kelgan bo'lsa, qancha vaqt (min) sekinlashgan tezlik bilan yurgan?

Vaznsiz prujinaga

m

massali sterjen ilinganda u

x

ga cho'zildi. Agar bu prujinani

\ell/3

2\ell/3

bo'lakka bo'lib sterjen yana ilinsa,

2\ell/3

uzunlikdagi prujina qanchaga cho'ziladi?

Rasmda

A

B

jismlar berilgan.

B

jism 4 s vaqt davomida 84 m yo'l bosib o'tgan bo'lsa,

A

jismni 6 s da bosib o'tgan yo'lini toping.

Agar

m

massali jismning quvvati

N = \alpha t

qonun bo'yicha chiziqli ortsa, jismning oniy tezligi qanday bo'ladi?

Tomonlari

d

bo'lgan kvadratning uchlariga rasmda ko'rsatilgandek jismlar joylashtirilgan. Sistemaning massa markazi koordinatalarini toping.

10^7

Pa bosim normal atmosfera bosimidan necha marta katta?

Absolyut deformatsiyasi 8 mm bo'lgan prujinaning nisbiy deformatsiyasi 0,2 % ga bo'lsa, uning dastlabki uzunligini toping (m).

10.

Mexanik kuchlanish 200 MPa, yuzasi esa 1,5 mm

^2

bo'lgan jismga ta'sir etuvchi kuchni (N) aniqlang.

11.

Ko'ndalang kesim yuzasi

S = 8

^2

bo'lgan 10 m uzunlikdagi sterjenning yung moduli 5 MPa bo'lsa, uning bikirligini (N/m) toping.

12.

Tebranma harakat qilayotgan jismning harakat tenglamasi

x = A\cos\omega t

ga teng bo'lsa, uning tezlanish tenglamasini toping.

13.

Ballonda modda miqdorlari teng bo'lgan azot, kislorod va vodorod gazlari bor. Agar azot gazining bosimi 14 kPa bo'lsa, ballondagi umumiy gaz bosimini (kPa) toping.

14.

Normal sharoitda havo va kislorod gazlarining zichliklari

\rho_1

\rho_2

ga, havoning molyar massasi

\mu

ga teng bo'lsa, kislorodning molyar massasini toping.

15.

Yopiq idishdagi argon gazining solishtirma issiqlik sig'imini toping.

16.

Radiusi 5 cm bo'lgan metall sfera sim yordamida yerga ulangan. Metall sfera markazidan qanday masofada

-24\ \mu

C zaryad joylashtirilsa, sfera sirtida 8

\mu

C zaryad to'planadi.

17.

Doimiy kuchlanish manbaiga ulangan o'tkazgichdan 6 A tok o'tmoqda. Agar o'tkazgichning 40 % i kesib tashlansa, undan qanday tok (A) oqib o'tadi?

18.

Xonadonda muzlatkich 1,3 kW, elektr plita 1,4 kW, televizor 0,3 kW, umumiy quvvati 1,4 kW bo'lgan 20 ta lampa 220 V kuchlanish tarmog'iga ulangan. Agar kechqurun 8 A tok kuchida elektromobil zaryadlansa, xonadon simlari qanday tok kuchiga mo'ljallangan bo'lishi kerak?

19.

EYuK lari bir xil 3 V dan bo'lgan tok manbalari rasmda ko'rsatilgandek ulangan. Agar tok manbalarining qarshiliklari 1

\Omega

va 3

\Omega

ga teng bo'lsa, voltmetr ko'rsatkichini aniqlang.

20.

Elektroliz vaqtida tok kuchi

I = 6 + 0{,}05t

[A] qonun bo'yicha o'zgarmoqda. 80 s vaqt davomida qanday massali (g) nikel ajralib chiqadi?

k = 0{,}35\cdot10^{-6}

kg/C

21.

Rasmdan foydalangan holda

A

nuqtadagi umumiy magnit maydon induksiya vektorini

C

nuqtadagi umumiy magnit maydon induksiya vektoriga nisbatini (

B_A/B_C

) toping.

22.

Magnit maydon induksiya chiziqlariga tik holda uchib kirgan zarra massasi 2 marta ortsa, uning aylanma harakat radiusi qanday o'zgaradi?

23.

Tebranish konturi sig'imi 1,8

\mu

F bo'lgan kondensator va induktivligi 0,5 H bo'lgan g'altakdan iborat. Tebranish konturida hosil bo'layotgan elektromagnit to'lqinning tebranish davrini toping (s).

24.

G'altakdan 1,6 A tok kuchi oqib o'tganda unda 30 Wb magnit oqimi vujudga keldi. Magnit oqimini o'zgartirmagan holda o'ramlar soni qanday o'zgartirilsa, 240 mJ magnit maydon energiyasi hosil bo'ladi?

25.

Suyuqlik sirtiga yorug'lik

36^\circ

burchak ostida tushmoqda. Agar sinish burchagi

24^\circ

bo'lsa, singan va akslangan nurlar orasidagi burchakni toping.

26.

Linzada buyumning 3 marta kichiklashgan to'g'ri va mavhum tasviri hosil bo'ldi. Agar buyum va tasvir orasidagi masofa 16 cm bo'lsa, linza fokusining modulini (cm) aniqlang.

27.

8 J necha eV ga teng?

28.

Quvvati 150 W bo'lgan lampa nurlayotgan o'rtacha to'lqin uzunligi 2,2

\mu

m. Lampadan

2{,}5\cdot10^{24}

ta fotonlar necha sekundda ajraladi?

29.

Metall sirtiga

0{,}75\cdot10^{15}

Hz chastotali fotonlar oqimi tushmoqda. Agar sirtga tushayotgan fotonlarning chastotasi 2 marta, tormozlovchi kuchlanish esa 3 marta ortgan bo'lsa, metall uchun qizil chegarani (m) toping.

30.

Yorug'lik tezligiga yaqin tezlikda harakat qilayotgan zarraning to'la energiyasi

E

ga, impulsi

p

ga teng bo'lsa. Zarraning tinchlikdagi massasini toping.

31.

Dastlab tinch turgan

\alpha

zarra tomon uzoqdan tezligi

v

bo'lgan proton markaziy yaqinlashmoqda. Ular orasidagi eng qisqa masofa nimaga teng?

32.

Vodorod atomi uchun birinchi bor orbita radiusi

0{,}53\cdot10^{-10}

m bo'lsa, ikkinchi va uchinchi orbita radiuslari farqini (

10^{-10}

m) toping.

Topshiriqlar (33-35) va javob variantlari (A-F) ni o'zaro moslashtiring.

33-35.

Misdan yasalgan radiuslari

r

2r

bo'lgan

A

B

sferalar o'zaro konsentrik joylashtirilgan. Ularning zaryadlari mos ravishda

q

-2q

ga teng.

Javob variantlari:

-k\dfrac{q}{3r}

-2k\dfrac{q}{r}

-k\dfrac{q}{3r}

-k\dfrac{q}{r}

-k\dfrac{q}{2r}

Savol	A	B	C	D	E	F
33. $A$ sfera sirtidagi potensialni toping.
34. $B$ sfera sirtidagi potensialni toping.
35. Agar $A$ va $B$ sferalar sim bilan tutashtirilsa, $A$ sfera markazidan $3r$ masofadagi potensialni aniqlang.

36.

Prujinaga 40 N cho'zuvchi kuch ta'sir etganda uning uzunligi 30 cm ga, 20 N siquvchi kuch ta'sir etganda esa uning uzunligi 15 cm ga teng bo'ldi.

a) Prujinaning boshlang'ich uzunligini (cm) toping.

b) Prujinaning 2 kg yuk osilgandagi uzunligini (m) toping.

37.

Kosmik kema yer atrofida

r

radiusli orbita bo'ylab harakatlanmoqda. Agar yer massasi

M

ga teng bo'lsa,

a) Kosmik kema tezligini toping.

b) Kosmik kemaning aylanish davrini toping.

38.

Radiaktiv sneryad massalari

m_1

m_2

m_3

va tezliklari mos ravishda

v_1

v_2

v_3

bo'lgan uchta bo'lakka bo'lindi.

a) Snaryadning bo'linmasdan oldingi impulsini toping.

b) Snaryadning bo'linishdan oldingi tezligini toping.

39.

Yopiq idishda 12 mol neon gazi bor.

a) Uning issiqlik sig'imini toping (J/K).

b) Uning solishtirma issiqlik sig'imini toping (J/(kg

\cdot

K)).

40.

1000 mol gaz sig'adigan polietilen paketda 6 mol geliy gazi bor.

a) Uning issiqlik sig'imini toping (J/K).

b) Uning solishtirma issiqlik sig'imini toping (J/(kg

\cdot

K)).

41.

Tomonining uzunligi

\ell

ga teng bo'lgan kvadratning uchta uchiga rasmda ko'rsatilgandek

-q

q

-2q

zaryadlar joylashtirilgan.

D

nuqtadagi potensialni toping.

b) Kvadrat markazidagi maydon kuchlanganligini toping.

42.

1200 kg massali elektromobil akkumulyatorining EYuKi 400 V ga teng. Elektromobil tezligini 30 m/s dan 5 m/s gacha kamaytirdi.

a) Bu paytda elektromobil akkumulyatorida qancha energiya (kJ) to'planishini toping.

b) Bu paytda elektromobil akkumulyatorida qancha zaryad (C) to'planadi?

43.

Intensivligi 24 W/m

^2

bo'lgan tabiiy yorug'lik nuri qutblagichga tushmoqda.

\sin\alpha = 0{,}8

a) Polyarizatordan o'tgan nurning intensivligini toping (W/m

^2

b) Analizatordan o'tgan nurning intensivligini toping (W/m

^2

44.

Kosmik kema

0{,}6c

tezlik bilan harakat qilmoqda. Ikkinchi kosmik kema esa unga yetib olmoqda. Agar ularning nisbiy tezliklari

0{,}8c

ga teng.

a) Ikkinchi kosmik kema tezligini klassik usulda toping.

b) Ikkinchi kosmik kema tezligini relyativistim (to'g'ri) usulda toping.

45.

Shaffof idishda har xil energetik holatdagi vodorod atomlari bor. Uning ionlanish energiyasi 13,6 eV ga teng.

a) Atom 1,89 eV energiyali foton yutib ionlashmadi. Keyingi ionlanish energiyasini toping (eV).

b) Atom 1,89 eV energiyali foton nurlatsa, ionlanish energiyasi qanchaga teng (eV)?