Ifomula yokwandisa

Imibuzo yesibonelo kanye namafomula okunweba

1. Uketshezi olusetshenziswa ukugcwalisa i-thermometer lwenziwe nge-mercury noma i-alcohol. Isisekelo sokwenza le thermometer yisimiso sokushintsha...

A. izinga lokukhula kwe-mercury ngenxa yokushintsha kwezinga lokushisa
B. ukumuncwa kokushisa ngenxa yezinguquko ekushiseni kwe-mercury
C. ingcindezi ngenxa yezinguquko ekushiseni kwe-mercury
D. ivolumu ngenxa yezinguquko ekushiseni kwe-mercury

Ingxoxo
Umthamo wento uyashintsha lapho izinga lokushisa layo lishintsha. Ngokuvamile, uma izinga lokushisa likhuphuka, umthamo uyakhuphuka, futhi ngokuphambene nalokho, uma izinga lokushisa lehla, umthamo uyancipha. Lokhu kusebenza nakwi-mercury kanye notshwala.
Impendulo efanele ngu-D.

2. Bheka isithombe se-bimetal ekushiseni okungu-26 ^o C ngezansi!

Uma i-bimetal ishiswa ibe yi-50^oC, izehlakalo ezenzekile bezinje:

Indlela yokugoba kanye nesizathu esifanele kuboniswa yi….

A. (1) kanye no-(2)
B. (1) kanye no-(4)
C. (2) kanye no-(3)
D. (3) kanye (4)

Ingxoxo
I-Bimetal iyinhlanganisela yezingcezu ezimbili zensimbi ezine-coefficients ehlukene yokwanda okuqondile, lapho ingxenye eyodwa yensimbi ine-coefficient enkulu yokwanda okuqondile kuyilapho enye ingxenye yensimbi ine-coefficient encane yokwanda okuqondile.

Uma izinga lokushisa lensimbi likhuphuka, insimbi ibhekana nokwanda kobude (ubude bensimbi buyanda), ngokuphambene nalokho, uma izinga lokushisa lensimbi liyancipha, insimbi ibhekana nokuncipha kobude (ubude bensimbi buyancipha). Ekukhuphukeni kokushisa okufanayo, izingcezu ezimbili zensimbi ziyanda ngobude obuhlukile ziyanda. Insimbi ene-coefficient enkulu yokwandiswa okuqondile ihlangabezana nokwanda kobude obukhulu, kuyilapho insimbi ene-coefficient encane yokwandiswa okuqondile ihlangabezana nokwanda kobude obuncane. Ngokufanayo, ngokuncipha kokushisa okufanayo, izingcezu ezimbili zensimbi ziyanda ngokuncipha kobude obuhlukile. Insimbi ene-coefficient enkulu yokwandiswa okuqondile ihlangabezana nokuncipha kobude obukhulu, kuyilapho insimbi ene-coefficient encane yokwandiswa okuqondile ihlangabezana nokuncipha kobude okuncane.

Ngakho-ke, lapho izinga lokushisa le-bimetal likhuphuka, umucu wensimbi one-coefficient enkulu yokwandiswa okuqondile ugoba uye emgqeni wensimbi one-coefficient encane. Kungani kunjalo? Ngoba lesi simo sivumela umucu wensimbi one-coefficient enkulu yokwandiswa okuqondile ukuba ube mude kunomucu wensimbi one-coefficient encane yokwandiswa okuqondile.
Ngokuphambene nalokho, lapho izinga lokushisa le-bimetal lehla, umucu wensimbi one-coefficient encane yokunwetshwa okuqondile ugoba uye emgqeni wensimbi one-coefficient enkulu yokunwetshwa okuqondile. Lesi simo sivumela umucu wensimbi one-coefficient enkulu yokunwetshwa okuqondile ukuba ube mfushane kune-strip yensimbi ene-coefficient encane yokunwetshwa okuqondile.
Impendulo efanele ngu-C.

3. Izinduku ezimbili ekuqaleni zingamamitha ayi-10 ubude ngayinye. Izinduku ezimbili zenziwe ngensimbi kanye ne-aluminium ezine-coefficients yokwanda okuqondile okungu-11 x 10 ngokulandelana.^-6 /^oC kanye no-24 x 10^-6 /^oC. Ngemva kokwenyuka kwezinga lokushisa ngo-40^oC, ubude bezinduku zensimbi neze-aluminium ngokulandelana buba...
A. 10,044 m kanye no-10,096 m
B. 10,0044 m kanye no-10,0096 m
C. 10,096 m kanye no-10,044 m
D. 10,0096 m kanye no-10,0044 m
Ingxoxo
Kuyaziwa ukuthi:
Ubude bokuqala (L)_o) induku yensimbi = amamitha ayi-10
Ubude bokuqala (L)_o) induku ye-aluminium = amamitha ayi-10
I-coefficient yokwanda okuqondile kwensimbi (α) = 11 x 10^-6 /^oC
I-coefficient yokwanda okuqondile kwe-aluminium (α) = 24 x 10^-6 /^oC
Ukushintsha kwezinga lokushisa (ΔT) = 40^oC
Umbuzo: Ubude bezinduku zensimbi ne-aluminium ngemva kokwenyuka kwezinga lokushisa
Impendulo:
Ifomula yokwandisa ubude:
L=L_o + ΔL
L=L_o + α L_o ΔT
Ubude bebha yensimbi ngemva kokwenyuka kwezinga lokushisa:
L=L_o + α L_o ΔT
L = 10 + (11 x 10^-6)(10)(40)
L = 10 + (11 x 10^-6)(400)
L = 10 + (4400 x 10^-6)
L = 10 + 0,0044
L = 10,0044 imitha

Ubude benduku ye-aluminium ngemva kokwenyuka kwezinga lokushisa:
L=L_o + α L_o ΔT)
L = 10 + (24 x 10^-6)(10)(40)
L = 10 + (24 x 10^-6)(400)
L = 10 + (9600 x 10^-6)
L = 10 + 0,0096
L = 10,0096 imitha
Impendulo efanele ingu-B.

4. Ibha yensimbi ene-coefficient yokwanda okuqondile i-α inobude obungu-l ekushiseni okungu-25^oC. Uma kushiswa kufikela ku-30^oC, ithola ukwanda kobude be-Δl. Uma insimbi isikwa ibe yi-1/3 yobude bayo bokuqala, ubude buyanda uma ishiswa ibe yi-35 degrees.^oU-C u….
A. 2/3 Δl
B. 3/2 Δl
C. 5/3 Δl
D. 5/2 Δl
Ingxoxo
Kuyaziwa ukuthi:
Uma
I-Coefficient yokwanda okuqondile kwensimbi (α) = α
Ubude bokuqala bensimbi (L)^o) = l
Ukwenyuka kwezinga lokushisa (ΔT) = 30^oC - 25^oC=5^oC
ufulawa
Ukwanda kobude (ΔL) = Δl
Umbuzo: Uma i-lo = 1/3 l kanye ne-ΔT = 35^oC - 25^oC=10^oC bese kuba nokwanda kobude = ….. ?
Impendulo:
Bala i-coefficient yokwanda okuqondile kwensimbi (α) usebenzisa ifomula yokwanda kobude bensimbi:

Sebenzisa le coefficient yenani lokunwetshwa okuqondile ukuze ubale ukwanda kobude bensimbi lapho izinga lokushisa layo lishintsha kusuka ku-25 ^o C kuya ku-35 ^o C.

Impendulo efanele ngu-A.

5. Ezingeni lokushisa elingu-20^oC, ubude benduku ye-aluminium bungama-200 cm. Uma ishiswa ifike ku-100 degrees^oUbude be-C bukhuphuka ngo-0,00384 m. Uma izinga lokushisa lingama-20^oC kukhona ibhola elenziwe ngezinto ezifanayo ze-aluminium, ngakho-ke ukuze ivolumu yebhola ikhuphuke ngo-1% wevolumu yebhola lokuqala, ibhola kumele lishiswe lifike ezingeni lokushisa...
A. 139^oC
B. 159^oC
C. 208^oC
D. 228^oC
Ingxoxo
Kuyaziwa ukuthi:
Ubude bokuqala benduku ye-aluminiyamu (L)_o) = 200 cm = 2 amamitha
Ukushintsha kwezinga lokushisa (ΔT) = 100^oC - 20^oC=80^oC
Ukwanda kobude (Δl) = 0,00384 amamitha
Umbuzo: Ukuze ivolumu yebhola ikhuphuke ngo-1% kusukela kuvolumu yokuqala yebhola, ibhola kumele lishiswe lifike ezingeni lokushisa elingu-...
Impendulo:
Bala i-coefficient yobude benduku ye-aluminium usebenzisa ifomula yokwandisa ubude:

I-coefficient yokwanda kwevolumu ye-aluminium (β) = 3 x i-coefficient yokwanda kwe-longitudinal (α) = 3 (0,000024) = 0,000072

Kuyaziwa ukuthi:
Ivolumu yokuqala yebhola = V
Ukwanda kwevolumu yebhola le-aluminiyamu (ΔV) = (1%)(V) = (1/100)(V) = V/100
Ukwenyuka kwezinga lokushisa (ΔT) = T – 20
Kubuziwe: Ibhola lishiswe lifike ezingeni lokushisa (T) = ….. ?
Impendulo:

Impendulo efanele ingu-B.

6. Ipuleti lensimbi eliyindilinga linezimbobo eziyindilinga eziqondile phakathi nendawo. Uma ipuleti lishiswa khona-ke...
A. Ububanzi bepuleti buyanda kanti ububanzi bembobo buyancipha
B. Ububanzi bepuleti buyancipha futhi ububanzi bembobo buyanda
C. ububanzi bepuleti buyanda futhi ububanzi bembobo buyanda
D. ububanzi bepuleti buyancipha kanti ububanzi bembobo buyancipha
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Ifomula yendawo yendilinga (A):
A = π r²
Ifomula yobubanzi besiyingi (D):
D = 2 r
Uma ipuleti lensimbi lishiswa, indawo (A) yepuleti lensimbi iyanda. Uma indawo yepuleti lensimbi iyanda, ububanzi (D) noma irediyasi (r) yepuleti lensimbi buyanda. Uma ububanzi (D) noma irediyasi (r) yepuleti lensimbi buyanda, ububanzi kanye nerediyasi yembobo kuyanda.
Impendulo efanele ngu-C.

7. Amafreyimu amabili ezibuko zamehlo enziwe ngepulasitiki enobubanzi obuqondile obungu-1,3 x 10^-4 (^oC)^-1. Izimbobo zelensi ziyindilinga enobubanzi obungu-2,2 cm. Ukuze izimbobo zelensi zikwazi ukwamukela amalensi anobubanzi obungu-2,21 cm, uhlaka lwengilazi yamehlo kumele lufudunyezwe kuze kube yilapho izinga lokushisa lishintsha ngo….
A. 25^oC
B. 35^oC
C. 45^oC
D. 55^oC
Ingxoxo
Kuyaziwa ukuthi:
I-Coefficient yokwanda okuqondile kwepulasitiki (α) = 1,3 x 10^-4 (^oC^-1)
Irediyasi yembobo yelensi (r)¹) = irediyasi yembobo yelensi yokuqala = 2,2 cm
Irediyasi yembobo yelensi ngemva kokushisa (r)²= 2,21cm
Umbuzo: Ushintsho lokushisa kohlaka lwengilazi yeso
Impendulo:
Ukuze imbobo yelensi ikwazi ukufakwa ilensi enobubanzi obungu-2,21 cm, ngemva kokushisa, ububanzi belensi kumele bukhuphuke ngo-2,21 cm – 2,20 cm = 0,01 cm.
I-coefficient yokwandiswa kwendawo yepuleti lensimbi (β) = 2 x i-coefficient yokwandiswa okuqondile (α) = 2 x 1,3 x 10^{-4 o}C^-1 = 2,6 x10^{-4 o}C^-1

Izinguquko zokushisa:

Impendulo efanele ingu-B.

8. Esithombeni esilandelayo, kukhona igebe phakathi kwemizila emibili yesitimela eyenziwe ngensimbi. Leli gebe lihloselwe...
A. Amandla okungqubuzana lapho isitimela sidlula ayancipha.
B. Ukudlidliza lapho isitimela sidlula kuba kuncane.
C. Imizila yesitimela ayigobi lapho insimbi ikhula
D. Imizila yesitimela ayigobi lapho isitimela sidlula phezu kwayo.
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Imizila yenziwe ngensimbi, ekhula kalula uma izinga lokushisa lishintsha. Ngosuku olushisayo, izinga lokushisa lemizila liyakhuphuka, okubangela ukuba ikhule. Lapho imizila igudlana namasondo esitimela, izinga lokushisa nalo liyakhuphuka, okubangela ukuba ikhule. Ngakho-ke, igebe phakathi kwemizila emibili lisiza ukuvimbela imizila ukuthi igobe lapho insimbi ikhula.
Impendulo efanele ngu-C.

9.
Insimbi kagesi ifakwe i-thermostat enqamula ngokuzenzakalelayo ugesi lapho insimbi ifinyelela izinga lokushisa elithile. Ukwanda kwezinga lokushisa kubangela ukuthi umucu we-bimetallic ugobe, njengoba kuboniswe esithombeni. Lokhu kwenzeka ngoba…
A. Ukushisa okuqondile kwensimbi (B) kukhulu kunokushisa okuqondile kwensimbi (A)
B. Ukushisa okuqondile kwensimbi (B) kuncane kunokushisa okuqondile kwensimbi (A)
C. I-coefficient yokwanda okuqondile kwensimbi (B) inkulu kune-coefficient yokwanda okuqondile (A)
D. I-coefficient yokwanda okuqondile kwensimbi (B) incane kune-coefficient yokwanda okuqondile (A)
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I-Bimetal yakhiwa insimbi u-A kanye nensimbi u-B ezinama-coefficient ahlukene okunwetshwa okuqondile. Ngokusekelwe esithombeni esingenhla, lapho izinga lokushisa likhuphuka, insimbi u-A ibonakala igoba iye kunsimbi u-B. Ngakho-ke, kungaphethwa ngokuthi ngokwanda okufanayo kwezinga lokushisa, insimbi u-A ibhekana nokwanda okuqondile kakhulu kuyilapho insimbi u-B inokwanda okuqondile okuncane. Ukwanda kobude bensimbi u-A kukhulu kunokwensimbi u-B, ngakho-ke insimbi u-A inokukhula okuqondile okukhulu kunensimbi u-B.
Impendulo efanele ngu-D.

Umthombo wombuzo:

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