Ukudluliselwa kokushisa

Kunezinhlobo ezintathu zokudlulisa ukushisa noma ukudlulisa ukushisa , okuhlanganisa ukudlulisa ukushisa ngokuqhutshwa komoya, ukudluliselwa kwamandla kagesi, kanye nemisebe.

Ukudluliselwa kokushisa ngokuqhutshwa komoya. Lapho into enokushisa okuphezulu ihlangana nento enokushisa okuphansi, amandla asuka entweni enokushisa okuphezulu aye entweni enokushisa okuphansi. Amandla engeziwe abangela ukuthi ama-athomu nama-molecule akha into ahambe ngokushesha. Njengoba ehamba, ama-molecule anamandla e-kinetic (EK = ½ mv ² ). Ama-molecule ahamba ngokushesha (anamandla amakhulu e-kinetic) ahlangana nama-molecule aseduze kwawo. Lawa ma-molecule abe esehlangana namanye ama-molecule aseduze kwawo. Njalo njalo. Ngakho ama-molecule ahlangana, edlulisela amandla. Ukudluliselwa kokushisa okwenzeka ngokushayisana phakathi kwama-molecule akha into kubizwa ngokuthi i-conduction. I-conduction ivame ukwenzeka ezintweni eziqinile noma kusukela ezintweni eziqinile kuya ezintweni eziwuketshezi (uketshezi kuya ezintweni eziqinile) noma kusukela ezintweni eziqinile kuya kumagesi (amagesi kuya ezintweni eziqinile).

Ukudluliselwa kokushisa nge-convection. I-Convection ivame ukwenzeka koketshezi (njengamanzi) kanye namagesi (njengomoya). I-Convection ukudluliselwa kokushisa okuhambisana nokunyakaza kwento ngenxa yezinguquko ekubuneni kwayo. Ubuningi bento buyashintsha njengoba ivolumu yayo ishintsha. Ubuningi bento buyashintsha njengoba into imunca ukushisa.

Ukudluliselwa kokushisa ngemisebe. Imisebe iwukudluliselwa kokushisa ngendlela yamagagasi kagesi. Izibonelo zemisebe zifaka phakathi ukufudumala umzimba wakho okuzwayo lapho useduze nesitofu kanye nemisebe evela elangeni iye emhlabeni. Ilanga linokushisa okuphezulu (cishe ama-Kelvin angu-6000), kanti umhlaba unokushisa okuphansi. Lo mehluko wokushisa phakathi kwelanga nomhlaba ubangela ukushisa ukuthi kusuke elangeni (ukushisa okuphezulu) kuye emhlabeni (ukushisa okuphansi). Uma imisebe evela elangeni iye emhlabeni idinga indawo, njengokuhambisa kanye nokudlulisa ukukhanya, ukushisa bekungeke kufinyelele emhlabeni ngoba bekuzodingeka kudlule endaweni engenamoya.

Isibonelo sezinkinga

1. Umbuzo Wokuhlolwa Kazwelonke We-SMA/MA We-Fiziksi We-2015/2016 Inombolo 19

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. 45^oC

B. 40^oC

C. 35^oC

D. 30^oC

E. 25^oC

Ingxoxo

Kuyaziwa ukuthi:

Ukushisa kwensimbi I = 4k

Ukushisa kwensimbi II = k

Izinga lokushisa lomphetho wensimbi I = 50^oC

Izinga lokushisa lomphetho wensimbi II = 0^oC

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, T₁-T₂ = ushintsho lokushisa, l = ubude benduku

Izinsimbi ezimbili zilingana ngobukhulu ngakho u-A no-l basuswa kulesi sibalo.

Impendulo efanele ingu-B.

2. Umbuzo Wokuhlolwa Kazwelonke We-SMA/MA We-Fiziksi We-2015/2016 Inombolo 19

Isithombe esilandelayo sibonisa izinduku zensimbi u-A no-B zezinhlobo ezahlukene ezihlanganiswe ekugcineni.

Indawo enqamulayo yazo zombili izinduku iyafana, kodwa ubude buka-A buphindwe kabili kunobude buka-B kanti i-coefficient yokushisa ye-A iphindwe kathathu kuno-B. Uma iziphetho ezikhululekile zika-A no-B zibhekene namazinga okushisa ahlukahlukene, khona-ke izinga lokushisa eliqondile endaweni yokuhlangana li...

A. 60^oC

B. 64^oC

C. 70^oC

D. 76^oC

E. 78^oC

Ingxoxo

Kuyaziwa ukuthi:

Ukushisa kwenduku A = 3k

Ukushisa kwenduku B = k

Ubude benduku A = 2l

Ubude benduku B = l

Izinga lokushisa lomphetho wenduku A = 100^oC

Izinga lokushisa lomphetho wenduku B = 40^oC

Kubuziwe: Izinga lokushisa ekuhlanganeni kwezinduku ezimbili

Impendulo:

Ifomula yesilinganiso sokudluliselwa kokushisa ngokuqhutshwa:

Incazelo: Q/t = izinga lokudlulisa ukushisa, k = ukuqhuba ukushisa, A = indawo engaphezulu, T₁-T₂ = ushintsho lokushisa, l = ubude benduku

Zombili izinduku zinendawo efanayo yokunqamula ngakho u-A ususiwe kulesi sibalo.

Impendulo efanele ngu-D.

3. Umbuzo Wokuhlolwa Kazwelonke We-SMA/MA We-Fiziksi We-2014/2015 Inombolo 14

Naka isitatimende esilandelayo:

(1) ukuhanjiswa kwensimbi

(2) umehluko wokushisa phakathi kweziphetho zensimbi

(3) ubude bensimbi

(4) isisindo sensimbi

Izici ezinquma izinga lokusabalala kokushisa ensimbini yilezi….

A. (1), (2), kanye (3)

B. (1) kanye no-(4)

C. (2) kanye no-(4)

D. (3) kanye (4)

E. (4) kuphela

Ingxoxo

Ukudluliselwa kokushisa ngensimbi kuwukudluliselwa kokushisa ngokuqhutshwa komoya. Ifomula yesilinganiso sokudluliselwa kokushisa ngokuqhutshwa:

Incazelo: Q/t = izinga lokudlulisa ukushisa, k = ukuqhuba ukushisa, A = indawo engaphezulu, T₁-T₂ = ushintsho lokushisa, l = ubude benduku

Impendulo efanele ngu-A.