Izibonelo eziyi-15 zemibuzo yokushisa nokushisa
Ukulinganiswa kweThermometer
1. I-thermometer elinganisiwe X ikhombisa -30 °C endaweni yokubanda kwamanzi kanye no-90 °C endaweni yokubila kwamanzi. Izinga lokushisa elingu-60 °C ku-X lilingana...
A. 20 o C
B. 45 o C
C. 50 o C
D. 75 o C
E. 80 o C
Ingxoxo
Kuyaziwa ukuthi:
Indawo yokuqandisa amanzi ku-thermometer X = -30 o
Iphuzu lokubila lamanzi ku-thermometer X = 90 o
Umbuzo: 60 o X = ….. o C
Impendulo:
Esikalini se-Fahrenheit, iphuzu lokubanda kwamanzi lingu-32 o F kanti iphuzu lokubanda kwamanzi lingu-212 o F. Phakathi kwephuzu lokubanda nephuzu lokubanda kwamanzi kukhona umehluko ongu-212 o – 32 o = 180 o.
Esikalini se-Celsius, iphuzu lokuqandisa lamanzi lingu-0 o C kanti iphuzu lokubila lamanzi lingu-100 o C. Phakathi kwephuzu lokuqandisa nephuzu lokubila lamanzi kunomehluko ongu-100 o – 0 o = 100 o.
Esikalini se-X, iphuzu lokuqandisa lamanzi lingu-30 o X kanti iphuzu lokubila lamanzi lingu-90 o X. Phakathi kwephuzu lokuqandisa nephuzu lokubila lamanzi kunomehluko ongu-90 o – (-30 o ) = 90 o + 30 o = 120 o.
Guqula isikali se-X sibe isikali se-Celsius:
Impendulo efanele ngu-D.
Ukwanda
2. Ibha yensimbi ishiswa ifike ezingeni lokushisa elingu-80 o C futhi ubude bayo bube ngu-115 cm. Uma i-coefficient yokwanda okuqondile kwensimbi ingu-3.10 -3 o C -1 kanti izinga lokushisa lokuqala lensimbi lingu-30 o C, khona-ke ubude bokuqala bensimbi bungu….
A. 100 cm
B. 101,5 cm
C. 102 cm
D. 102,5 cm
E. 103 cm
Ingxoxo
Kuyaziwa ukuthi:
Izinga lokushisa lokuqala (T1 ) = 30 o C
Izinga lokushisa lokugcina (T2 ) = 80 o C
Ukushintsha kwezinga lokushisa (ΔT) = 80 o C – 30 o C = 50 o C
I-coefficient yokwanda okuqondile kwensimbi (α) = 3.10 -3 o C -1
Ubude bokugcina bensimbi (L) = 115 cm
Okufunwayo: Ubude bokuqala bensimbi ( Lo )
Impendulo:
Ifomula yokwandisa ubude:
Impendulo efanele ngu-A.
3. Induku yethusi ekuqaleni inobude obungu-40 cm. Uma ishiswa ekushiseni okungu-80 o C ubude bayo buba ngu-40,04 cm. Uma i-coefficient of linear expansion yethusi ingu-2,0 x 10 -5 o C -1 khona-ke izinga lokushisa lokuqala lenduku yethusi….
A. 20 o C
B. 22 o C
C. 25 o C
D. 30 o C
E. 50 o C
Ingxoxo
Kuyaziwa ukuthi:
Izinga lokushisa lokugcina (T2 ) = 80 o C
Ubude bokuqala (Lo ) = 40 cm
Ubude bokugcina (L) = 40,04 cm
Ukwanda kobude (ΔL) = 40,04 cm – 40 cm = 0,04 cm
I-coefficient yokwanda okuqondile kwethusi (α) = 2,0 x 10 -5 o C -1
Umbuzo: Izinga lokushisa lokuqala ( T1 )
Impendulo:
Ifomula yokwandisa insimbi:
0,04 = (2,0 x 10 -5 )(40)(80 – T 1 )
0,04 = (80 x 10 -5 )(80 – T 1 )
0,04 = 0,0008 (80 – T 1 )
0,04 = 0,064 – 0,0008 T 1
0,0008 T 1 = 0,064 – 0,040
0,0008 T 1 = 0,024
I-T 1 = 30 o C
Impendulo efanele ngu-D.
Ukudluliselwa Kokushisa Ngokuqhutshwa Komoya
4. Izinduku zensimbi ezinobukhulu obufanayo, kodwa ezenziwe ngezinsimbi ezahlukene, zihlanganisiwe njengoba kuboniswe esithombeni esingezansi. Uma ukuhanjiswa kokushisa kwensimbi I kuphindwe kane kunokuhanjiswa kwensimbi II, khona-ke izinga lokushisa lapho kuhlangana khona izinsimbi ezimbili…
A. 450 C
B. 40 0 C
C. 35 0 C
D. 30 0 C
E. 25 0 C
Ingxoxo
Kuyaziwa ukuthi:
Usayizi wesiqu ofanayo
Ukushisa kwensimbi I = 4k
Ukushisa kwensimbi II = k
Izinga lokushisa le-incam yensimbi I = 50 0 C
Izinga lokushisa lesihloko sensimbi II = 0 0 C
Kubuziwe: Izinga lokushisa lapho kuhlangana khona izinsimbi ezimbili
Impendulo:
Ifomula yesilinganiso sokudluliselwa kokushisa ngokuqhutshwa:
Incazelo: Q/t = izinga lokudlulisa ukushisa, k = ukuqhuba ukushisa, A = indawo engaphezulu, T 1 -T 2 = ushintsho lokushisa, l = ubude benduku
Izinga lokushisa endaweni yomngcele P no-Q:
Izinduku ezimbili zensimbi u-A no-B zilingana ngobukhulu ngakho indawo engaphezulu (A) kanye nobude (l) bezinduku kuyasuswa kulesi sibalo.
Impendulo efanele ingu-B.
5. Naka lesi sitatimende esilandelayo!
(1) Ukuqhuba kwensimbi
(2) Umehluko wokushisa phakathi kweziphetho zensimbi
(3) Ubude bensimbi
(4) Isisindo sensimbi
Izici ezinquma izinga lokusabalala kokushisa ensimbini yilezi...
A. (1), (2) kanye no-(3)
B. (1) kanye no-(4)
C. (2) kanye no-(4)
D. (3) kanye (4)
E. (4) kuphela
Ingxoxo
Ngokusekelwe kwifomula yesilinganiso sokudluliselwa kokushisa ngokuqhutshwa komoya, izici ezinquma izinga lokudluliselwa kokushisa ukuhanjiswa komoya kwensimbi (k), umehluko wokushisa phakathi kwemikhawulo yensimbi (T) nobude bensimbi (l). Isisindo sensimbi asinawo umphumela.
Impendulo efanele ngu-A.
6. Izinduku ezimbili ze-PQ ezinobukhulu obufanayo, kodwa izinhlobo ezahlukene zensimbi zinamathiselwe njengoba kuboniswe esithombeni esingezansi. Uma i-coefficient yokuqhuba ukushisa u-P iphindwe kabili kune-coefficient yokuqhuba ukushisa u-Q, khona-ke izinga lokushisa emngceleni ophakathi kuka-P no-Q...
A. 84°C
B. 78°C
C. 72°C
D. 70°C
E. 90°C
Ingxoxo
Kuyaziwa ukuthi:
Izinduku ze-PQ zinobukhulu obufanayo.
I-coefficient yokuqhuba ukushisa kwensimbi P (k P ) = 2k
I-coefficient yokuqhuba ukushisa kwensimbi Q (k Q ) = k
Umbuzo: Izinga lokushisa endaweni yomngcele u-P no-Q
Impendulo:
Ifomula yesilinganiso sokudluliselwa kokushisa ngokuqhutshwa:
Incazelo: Q/t = izinga lokudlulisa ukushisa, k = ukuqhuba ukushisa, A = indawo engaphezulu, T 1 -T 2 = ushintsho lokushisa, l = ubude benduku
Izinga lokushisa endaweni yomngcele P no-Q:
Izinduku ze-PQ zilingana ngobukhulu ngakho u-A no-l basuswa kulesi sibalo.
Ayikho impendulo efanele.
Ushintsho Lwefomu
7. I-1 kg yeqhwa ekushiseni okungu-0 ° C ixutshwa no-0,5 kg wamanzi ekushiseni okungu-0 ° C, bese...
A. amanye amanzi ayaqanda
B. elinye iqhwa liyancibilika
C. lonke iqhwa liyancibilika
D. wonke amanzi ayaqanda
E. isisindo seqhwa emanzini sihlala singaguquguquki
Ingxoxo
Igama elithi iqhwa lisho amanzi aqinile, kanti igama elithi amanzi lisho amanzi aqinile.
Ku-0 ° C, iqhwa liyashintsha lisuka ekubeni yinto eqinile libe uketshezi. Ngenxa yalolu shintsho esimweni, iqhwa kumele limunce ukushisa. Iqhwa lixutshwa namanzi, ngakho-ke iqhwa kufanele limunce ukushisa emanzini. Kodwa-ke, amanzi nawo aku-0 ° C, ngakho akukho ukushisa okungamuncwa yiqhwa. Ngakho-ke, isisindo seqhwa emanzini sihlala singaguquki.
Impendulo efanele ngu-E.
Umgomo Omnyama
8. Esitsheni sensimbi esinesisindo esingamagremu angu-200, kukhona amagremu ayi-100 kawoyela ekushiseni okungu-20 o C. Esitsheni, kufakwa amagremu angu-50 ensimbi ekushiseni okungu-75 o C. Uma izinga lokushisa lesitsha likhuphuka ngo-5 o C kanti ukushisa kwamafutha = 0,43 cal/g o C, khona-ke ukushisa kwensimbi...
A. 0,143 cal/g o C
B. 0,098 cal/g o C
C. 0,084 cal/g o C
D. 0,075 cal/g o C
E. 0,064 cal/g o C
Ingxoxo
Kuyaziwa ukuthi:
Isisindo sesitsha sensimbi (m) = 200 gr
Izinga lokushisa lokuqala lesitsha sensimbi (T1 ) = 20 o C
Amafutha asesitsheni sensimbi ngakho izinga lokushisa lamafutha = izinga lokushisa lesitsha sensimbi.
Izinga lokushisa lokugcina lesitsha sensimbi (T2 ) = 20 o C + 5 o C = 25 o C
Isisindo samafutha (m) = amagremu ayi-100
Ukushisa okuqondile kwamafutha (c uwoyela) = 0,43 cal/g o C
Izinga lokushisa lokuqala likawoyela (T 1 ) = 20 o C
Uwoyela usesitsheni ukuze uwoyela ube semlingeni wokushisa nesitsha sensimbi. Ngakho-ke uma izinga lokushisa lokugcina lesitsha sensimbi lingu-25 o C, khona-ke izinga lokushisa lokugcina lamafutha lingu-25 o C.
Izinga lokushisa lokugcina likawoyela (T 2 ) = 20 o C + 5 o C = 25 o C
Isisindo sensimbi (m) = 50 amagremu
Izinga lokushisa lokuqala lensimbi (T 1 ) = 75 o C
Insimbi ifakwa emafutheni esitsheni, ngakho insimbi isesimweni sokulingana kokushisa namafutha kanye nesitsha. Ngakho-ke uma izinga lokushisa lokugcina lesitsha lingu-25 o C, khona-ke izinga lokushisa lokugcina lensimbi lingu-25 o C.
Umbuzo: Ukushisa okuqondile kwensimbi (c insimbi)
Impendulo:
Ukushisa okukhishwa yinsimbi:
Q = mc ΔT = (50)(c)(75-25) = (50)(c)(50) = 2500c amakhalori
Ukushisa okumuncwa yisitya sensimbi:
Q = mc ΔT = (200)(c)(25-20) = (200)(c)(5) = 1000c amakhalori
Ukushisa okumuncwa uwoyela:
Q = mc ΔT = (100)(0,43)(25-20) = (43)(5) = amakhalori angu-215
Isimiso sikaBlack sithi ohlelweni oluvaliwe noluhlukanisiwe, ukushisa okukhishwa yinto enokushisa okuphezulu kumuncwa yinto enokushisa okuphansi.
I-Q ikhishwe = I-Q imuncwe
2500c = 1000c + 215
2500c – 1000c = 215
1500c = 215
c = 215/1500
c = 0,143 cal/g o C
Impendulo efanele ngu-A.
9. Ingilazi equkethe amagremu angu-200 amanzi ekushiseni okungu-20°C igcwaliswa ngamagremu angu-50 eqhwa ekushiseni okungu--2°C. Uma kwenzeka ukushintshana kokushisa kuphela phakathi kwamanzi neqhwa, ngemva kokulingana, okulandelayo kuzotholakala: (c amanzi = 1 cal/gr°C; c iqhwa = 0,5 cal/gr°C; L = 80 cal/gr)
A. lonke iqhwa liyancibilika futhi izinga lokushisa lingaphezu kuka-0°C
B. lonke iqhwa liyancibilika futhi izinga lokushisa lingu-0°C
C. Akulona lonke iqhwa elincibilikayo futhi izinga lokushisa lingu-0°C
D. izinga lokushisa lohlelo lonke lingaphansi kuka-0°C
E. amanye amanzi ayaqina futhi izinga lokushisa lesistimu lingu-0°C
Ingxoxo
Kuyaziwa ukuthi:
Isisindo samanzi (m amanzi ) = 200 amagremu
Izinga lokushisa lamanzi ( amanzi angu-T ) = 20 ° C
Ukushisa kwamanzi okuthile (c amanzi ) = 1 cal/gr°C
Isisindo seqhwa (m es ) = 50 amagremu
Izinga lokushisa leqhwa (T es ) = -2 o C
Ukushisa okuqondile kweqhwa (c es ) = 0,5 cal/gr°C
Ukushisa kwamanzi ancibilikayo (L) = 80 cal/gr
Impendulo:
Fudumeza ukuze uphakamise izinga lokushisa leqhwa kusuka ku-2 o C kuya ku-0 o C:
Q = mc ΔT
Q = (50 gram)(0,5 cal/gr°C)(0 o C – (-2 o C))
Q = (50)(0,5 cal)(2)
Q = amakhalori angu-50
Fudumeza ukuze uncibilikise lonke iqhwa emanzini:
Q = m L = (amagremu angu-50)(80 cal/gram) = amakhalori angu-4000
Fudumeza ukuze wehlise izinga lokushisa lamanzi wonke kusukela ku-20 o C kuya ku-0 o C:
Q = mc ΔT
Q = (200 gram)(1 cal/gr°C)(0 o C – (20 o C))
Q = (200)(1 cal)(-20)
Q = -4000 amakhalori
Uphawu oluhle lusho ukuthi kufakwe ukushisa, uphawu olubi lusho ukuthi kukhishwe ukushisa.
Ukushisa okudingekayo ukuze kukhushulwe izinga lokushisa leqhwa liye ku-0 ° C kungama-calories angu-50, kanti ukushisa okudingekayo ukuze kuncibilikiswe lonke iqhwa kungama-calories angu-4000. Ngakho-ke, ukushisa okuphelele okudingekayo ukuze kuncibilikiswe lonke iqhwa kungama-calories angu-4050. Ukushisa okutholakalayo ukushisa okukhishwa ngamanzi, okungama-calories angu-4000.
Kungaphethwa ngokuthi ukushisa okutholakalayo akwanele ukuncibilikisa lonke iqhwa libe ngamanzi. Iningi leqhwa lincibilikile libe ngamanzi, kodwa ingxenye encane ayincibilikile. Lawa manzi kanye neqhwa elisele liku-0 ° C.
Impendulo efanele ngu-C.
10. Ucezu lwe-aluminiyamu olunesisindo esingamagremu angu-200 olunezinga lokushisa elingama-20 o C lufakwa esitsheni samanzi esinobunzima obungamagremu ayi-100 kanye nezinga lokushisa elingama-80 o C. Uma izinga lokushisa elithile le-aluminiyamu lingu-0,22 cal/g o C kanti izinga lokushisa elithile lamanzi lingu-1 cal/g o C, khona-ke izinga lokushisa lokugcina le-aluminiyamu liseduze...
A. 20 o C
B. 42 o C
C. 62 o C
D. 80 o C
E. 100 o C
Ingxoxo
Kuyaziwa ukuthi :
Isisindo se-aluminium = 200 amagremu
Izinga lokushisa le-aluminiyamu = 20 o C
Isisindo samanzi = amagremu ayi-100
Izinga lokushisa lamanzi = 80 o C
Ukushisa okuqondile kwe-aluminium = 0,22 cal/g o C
Ukushisa kwamanzi okuqondile = 1 cal/g o C
Kubuziwe : izinga lokushisa lokugcina le-aluminiyamu
Impendulo :
I-aluminiyamu isemanzini ngakho izinga lokushisa lokugcina le-aluminiyamu = izinga lokushisa lokugcina lamanzi.
Ukushisa okukhishwa amanzi okushisa aphezulu (u-Q ukhishwe) = ukushisa okumuncwa yi-aluminium yokushisa ephansi (u-Q ukhishwe)
m amanzi c (ΔT) = m i-aluminiyamu c (ΔT)
(100)(1)(80 – T) = (200)(0,22)(T – 20)
(100)(80 – T) = (44)(T – 20)
8000 – 100T = 44T – 880
8000 + 880 = 44T + 100T
8880 = 144T
T = 62 o C
Impendulo efanele ngu-C.
11. Uhlamvu lwemali olungama-50g olufakwe ekushiseni okungu-85°C lucwiliswa ku-50g wamanzi ekushiseni okungu-29,8°C (ukushisa okuthile kwamanzi = 1 cal.g —1 .°C —1 ). Uma izinga lokushisa lokugcina lingu-37°C futhi isitsha singamunci ukushisa, khona-ke ukushisa okuthile kwensimbi…
A. 0,15 cal.g -1 .°C -1
B. 0,30 cal.g -1 .°C -1
C. 1,50 cal.g -1 .°C -1
D. 4,8 cal.g -1 .°C -1
E. 7,2 cal.g -1 .°C -1
Ingxoxo
Kuyaziwa ukuthi :
Isisindo sensimbi (m insimbi ) = 50 amagremu
Izinga lokushisa lensimbi = 85 o C
Isisindo samanzi (m amanzi ) = 50 amagremu
Izinga lokushisa lamanzi = 29,8 o C
Ukushisa kwamanzi okuthile (c amanzi ) = 1 cal.g -1 .°C -1
Izinga lokushisa lokugcina lenhlanganisela = 37 o C
Kubuziwe : ukushisa kwensimbi ethile (c insimbi)
Impendulo :
Ukushisa okukhishwa yinsimbi yokushisa okuphezulu (u-Q ukhishwe) = ukushisa okumuncwa amanzi okushisa aphansi (u-Q ukhishwe)
m insimbi c (ΔT) = m amanzi c (ΔT)
(50)(c)(85 – 37) = (50)(1)(37 – 29,8)
(c)(85 – 37) = (1)(37 – 29,8)
48 c = 7,2
c = 0,15 cal.g -1 .°C -1
Impendulo efanele ngu-A.
12. I-ice cube engamagremu angu-50 ku-0°C ifakwe emanzini angamagremu angu-200 ku-30°C ibekwe esitsheni esikhethekile. Ake sithi isitsha asimunci ukushisa. Uma ukushisa kwamanzi kungama-cal.g angu-1 - 1 °C -1 kanti ukushisa kokuhlanganiswa kweqhwa kungama-cal.g angu - 80 , khona-ke izinga lokushisa lokugcina lenhlanganisela liyi….
A. 5°C
B. 8°C
C. 11°C
D. 14°C
E. 17°C
Ingxoxo
Kuyaziwa ukuthi :
Isisindo seqhwa (m es ) = 50 amagremu
Izinga lokushisa leqhwa = 0°C
Isisindo samanzi (m amanzi ) = 200 amagremu
Izinga lokushisa lamanzi = 30 o C
Ukushisa kwamanzi okuthile (c amanzi ) = 1 cal.g – 1 °C –1
Ukushisa kweqhwa elincibilikayo ( iqhwa eli-L ) = 80 cal.g –1
Kubuziwe : izinga lokushisa lokugcina lengxube
Impendulo :
Qala ulinganisele isimo sokugcina:
Ukushisa okukhishwa ngamanzi ukuze kwehlise izinga lokushisa kusuka ku-30 o C kuya ku-0 o C:
Q okuxekethile = m amanzi c amanzi (ΔT) = (200)(1)(30-0) = (200)(30) = 6000
Ukushisa okudingekayo ukuze kuncibilikiswe lonke iqhwa:
U-Q melt = m es L es = (50)(80) = 4000
Ukushisa okusetshenziselwa ukuncibilikisa lonke iqhwa kungama-4000 kuphela kanti inani lokushisa elitholakalayo lingama-6000. Kungaphethwa ngokuthi izinga lokushisa lokugcina lenhlanganisela lingaphezu kwama-0 ° C.
Isimiso Esimnyama :
Ukushisa okukhishwa ngamanzi = ukushisa ukuze kuncibilikiswe lonke iqhwa + ukushisa ukuze kuphakanyiswe izinga lokushisa lamanzi eqhwa
(m amanzi )(c amanzi )(ΔT) = (m es )(L es ) + (m es )(c amanzi )(ΔT)
(200)(1)(30-T) = (50)(80) + (50)(1)(T-0)
(200)(30-T) = (50)(80) + (50)(T-0)
6000 – 200T = 4000 + 50T – 0
6000 – 4000 = 50T + 200T
2000 = 250T
T = 2000/250
T = 8 o C
Impendulo efanele ingu-B.
Izinguquko esimweni sendaba
13. Igrafu engezansi ikhombisa ubudlelwano phakathi kwezinga lokushisa (T) nokushisa (Q) okusetshenziswa ku-1 gram yento eqinile. Inani lokushisa lokuhwamuka kwento eqinile…
A. Amakhalori angu-60/igremu
B. 70 amakhalori/igremu
C. 80 amakhalori/igremu
D. 90 amakhalori/igremu
E. Amakhalori ayi-100/igremu
Ingxoxo:
Ukushisa kokuhwamuka yinani lokushisa elimuncwa (noma elikhishwa) yi-1 gram yento ukushintsha isimo sayo kusuka koketshezi kuya kugesi (noma kusuka kugesi kuya koketshezi).
I-Diketahui :
Ukushisa okumuncwayo noma okukhishwe: Q = amakhalori angu-140 – amakhalori angu-60 = amakhalori angu-80
Isisindo sezinto eziqinile: m = 1 gram
Kubuziwe :
Ukushisa ngomusi (L)v) izinto eziqinile?
Jawab :
Ifomula yokunquma ukushisa komusi :
Q = m Lv
Incazelo: Q = ukushisa okumuncwayo noma okukhishwe, m = isisindo sento, Lv = ukushisa komusi
Lv = Q / m
Lv = amakhalori angu-80 / igremu eli-1
Lv = amakhalori angu-80/igremu
Impendulo efanele ngu-C.
14. Ngezansi kunegrafu yokushisa uma kuqhathaniswa nokushisa kwe-1 kg yesitimu ngengcindezi evamile. Izinga lokubila kwamanzi lingu-2256 x 103 I-J/kg kanye nokushisa kwamanzi okuqondile kungu-4,2 x 103 J/kg K, bese ukushisa okukhishwe ekushintsheni kusuka kumusi kuya emanzini…
A. 4,50 × 103 Joule
B. 5,20 × 103 Joule
C. 2,00 × 106 Joule
D. 2,26 × 106 Joule
E. 4,40 × 106 Joule
Ingxoxo:
I-Diketahui :
Ukushisa ngomusi noma ukushisa okubilayo (L)v) = 2.256 x 103 J/kg
Ukushisa kwamanzi okuqondile (c) = 4200 J/kg K
Isisindo somusi (m) = 1 kg
Kubuziwe :
Ukushisa kukhishwe (Q)?
Jawab :
Q = m Lv
Q = (1 kg)(2.256 x 103 J/kg)
Q = 2256 x 103 Joule
Q = 2,256 x 106 Joule
Impendulo efanele ngu-D.
15. Inani lokushisa elimuncwayo ukuze kukhushulwe izinga lokushisa elingu-2 kg lamanzi kusuka ku-2 oC kuya ku-10 oC… Ukushisa kwamanzi okukhethekile = 4.200 J/kg Co, ukushisa kweqhwa elithile = 2.100 J/kg Co, ukushisa kokuhlanganiswa kwamanzi (LF) = 334.000 J/kg
A. 760.400 J
B. 750.000 J
C. 668.000 J
D. 600.000 J
E. 540.000 J
Ingxoxo:
I-Diketahui :
Isisindo (m) samanzi = 2 kg
Izinga lokushisa lokuqala (T) = -2 oC
Izinga lokushisa lokugcina (T) = 10 oC
Ukushisa okuqondile kweqhwa (c es) = 2100 J/kg Co
Ukushisa kwamanzi okuqondile (c amanzi) = 4200 J/kg Co
Ukushisa kokuhlanganiswa kwamanzi (L)F) = 334.000 J/kg
Kubuziwe :
Kumuncwe ukushisa (Q)?
Jawab :
Ukushintsha kwezinga lokushisa kusuka ku-2 oC kuya ku-10 oU-C udlula ezigabeni eziningana.
Isigaba 1, izinga lokushisa leqhwa liyakhuphuka lisuka ku--2 oC kuya ku-0 oC (ukwenyuka kwezinga lokushisa kweqhwa kuyama endaweni yokubanda kwamanzi, okungu-0 oC)
Isigaba sesi-2, lonke iqhwa liyancibilika (isimo esiqinile siyashintsha sibe yisimo soketshezi lapho izinga lokushisa lamanzi liba sezingeni lokubanda, okungu-0 oC)
Isigaba sesi-3, izinga lokushisa lamanzi liyakhuphuka futhi lisuka ku-0 oC kuya ku-10 oC)
Ngakho-ke kusukela ekushiseni okungu-2 oC kuya ku-0 oC, amanzi asesesesimweni esiqinile. Uma izinga lokushisa liyi-0 oC, kukhona ushintsho kusuka kokuqinile kuya kokuketshezi. Ngemva kokuba isimo sokuqinile sishintshele esimweni sokuketshezi, izinga lokushisa lamanzi liyakhuphuka futhi lisuka ku-0 oC kuya ku-10 oC.
Q1 = (m)(c es)(delta T) = (2 kg)(2100 J/kg Co)(0 oC – (-2) oC)) = (2)(2100 J)(2) = 8400 J
Q2 = (m)(LF) = (2 kg)(334.000 J/kg) = 668.000 J
Q3 = (m)(c amanzi)(i-delta T) = (2 kg)(4200 J/kg Co)(10 oC - 0 oC)) = (2)(4200 J)(10) = 84000 J
Ukushisa okumuncwayo:
Q = Q1 +Q2 +Q3
Q = 8400 J + 668.000 J + 84000 J
Q = 760.400 Joule
Impendulo efanele ngu-A.
Umthombo wombuzo:
Imibuzo Yefiziksi Yezivivinyo Zikazwelonke Zesikole Samabanga Aphezulu/Isikole Samabanga Aphezulu Sokufundela Umsebenzi
