Mienzaniso mishanu yeMibvunzo yeKutamisa Kupisa
1. Matavi maviri P naQ ane saizi imwe chete asi mhando dzakasiyana dzesimbi dzakasungirirwa sezvakaratidzwa mumufananidzo uri pazasi. Kana chiyero chekupisa cheP chiri kaviri chiyero chekupisa cheQ, saka tembiricha iri pamuganhu weP naQ...
A. 600 oC
B. 200 o C
C. 100 o C
D. 90 o C
E. 60 o C
Kukurukurirana
Zvinozivikanwa kuti:
Matavi maviri P naQ ane saizi imwe chete
Chiyero chekufambisa kupisa P chakapetwa kaviri chiyero chekufambisa kupisa Q
Tembiricha yemugumo wetsvimbo P i90 o , tembiricha yemugumo wetsvimbo Q i0 o uye tembiricha iri pakati petsvimbo P naQ iT.
Mubvunzo: Tembiricha pamuganhu P na Q
Mhinduro:
Fomura yekufambiswa kwekupisa nekufambisa :
Tsananguro: Q/t = mwero wekutamisa kupisa, k = kutenderera kwekupisa, A = nzvimbo yepakati, T 1 = tembiricha yakakwira, T 2 = tembiricha yakaderera, l = kureba kwechinhu.
Matavi maviri P naQ ane saizi yakafanana saka nzvimbo yepamusoro (A) nehurefu (l) zvinonyangarika kubva muequation. Equation iri pamusoro inoshanduka kuita:
Chiyero chekupisa (thermal conduction coefficient) P chinopetwa kaviri pane chiyero chekupisa (thermal conduction coefficient) Q. Equation iri pamusoro inoshanduka kuita seizvi:
Tembiricha yemuromo wetsvimbo P i90 o , tembiricha yemuromo wetsvimbo Q i0 o uye tembiricha iri pakati petsvimbo P naQ iT. Equation iri pamusoro inoshanduka kuita:
Tembiricha iri pakati peP neQ iri 60 o C.
Mhinduro chaiyo ndiE.
2. Rods A naB dzine nzvimbo yakaenzana uye kureba kwakafanana. Kana coefficient yerod A = 1/4 coefficient yerod B, saka ese ari maviri anodziiswa kune rimwe divi uye zvinozoonekwa kuti ese ari maviri anosangana nekuchinja kwakafanana kwetembiricha. Ipapo chiyero chehuwandu hwekuchinja kwekupisa kwerod A nerod B ndeche…..
A. 1: 4
B. 1: 2
C. 1 : 1
D. 2: 1
Chikamu 4: 1
Kukurukurirana
Zvinozivikanwa kuti:
Nzvimbo yetsvimbo A (A) = nzvimbo yetsvimbo B (A)
Kureba kwetsvimbo A (l) = kureba kwetsvimbo B (l)
Kukosha kwemudonzvo wetsvimbo A (k) = 1/4 kakapetwa kosha yemudonzvo wetsvimbo B (1/4 k)
Kuchinja kwekupisa kwebha A (ΔT) = kuchinja kwekupisa kwebha B (ΔT)
Zvinodiwa: Kuenzanisa kumhanya kwekupisa kwetsvimbo A netsvimbo B
Mhinduro:
Fomura yekufambiswa kwekupisa nekufambisa:
Tsananguro: Q/t = mwero wekutamisa kupisa, k = kutenderera kwekupisa, A = nzvimbo yepakati, T 2 = tembiricha yakakwira, T 1 = tembiricha yakaderera, l = kureba kwechinhu.
Nzvimbo yepakati pechikamu yakafanana, kureba kwetsvimbo kwakafanana, kuchinja kwekushisa kwakafanana.
Mhinduro chaiyo ndiE.
3. Matavi maviri esimbi A neB ane saizi imwe chete imwe neimwe ine coefficient yekufambisa ye2k nek zvakateerana.
Zvose zvakabatana pamwe chete uye magumo akasununguka anoiswa patembiricha sezvakaratidzwa mumufananidzo.
Tembiricha (T) panhengo yesimbi A naB...
A. 80 o C
B. 100 o C
C. 120 o C
D. 150 o C
E. 160 o C
Kukurukurirana
Zvinozivikanwa kuti:
Matavi maviri esimbi A neB ane saizi imwe chete
Kubudirira kwesimbi A = 2k
Kukosha kwesimbi yekufambisa B = k
Kupisa kwemuromo wesimbi A = 210 o C
Kupisa kwemuromo wesimbi B = 30 o C
Zvinodiwa: Tembiricha (T) pamisungo yesimbi A neB
Mhinduro:
Fomura yekufambiswa kwekupisa nekufambisa :
Tsananguro: Q/t = mwero wekutamisa kupisa, k = kutenderera kwekupisa, A = nzvimbo yepamusoro, T 1 -T 2 = kuchinja kwekupisa, l = kureba kwetsvimbo
Matavi maviri esimbi A naB ane saizi imwe chete saka nzvimbo yepamusoro (A) nehurefu (l) hwematanda acho zvinobviswa muequation.
Mhinduro chaiyo ndiD.
4. Matavi maviri emuchina ane urefu hwakafanana nenzvimbo yakafanana yepakati akabatana pamwe chete sezvakaratidzwa mumufananidzo uri pazasi . Chiyero chemuchina wemuchina wechipiri chemuchina we ...
A. 30 oC
B. 35 o C
C. 40 o C
D. 45 o C
E. 50 o C
Kukurukurirana
Zvinozivikanwa kuti:
Matavi maviri esimbi A neB ane saizi imwe chete
Kukwanisa kwekufambisa kwetsvimbo I = k
Kukodzera kwemudonzvo wetsvimbo II = 2k
Kupisa kwemuromo wetsvimbo I = 100 o C
Kupisa kwemuromo wetsvimbo II = 25 o C
Akabvunzwa: Kupisa pamisungo yetsvimbo I neII
Mhinduro:
Fomura yekufambiswa kwekupisa nekufambisa:
Tsananguro: Q/t = mwero wekutamisa kupisa, k = kutenderera kwekupisa, A = nzvimbo yepamusoro, T 1 -T 2 = kuchinja kwekupisa, l = kureba kwetsvimbo
Matavi maviri esimbi A naB ane saizi imwe chete saka nzvimbo yepamusoro (A) nehurefu (l) hwematanda acho zvinobviswa muequation.
Mhinduro chaiyo ndiC.
5. Matavi matatu akasiyana esimbi A, B naC asi ane urefu hwakafanana nenzvimbo yakafanana, akabatana sezvakaratidzwa mumufananidzo uri pazasi.
Kufambisa kukuru 4 kA = 2 kB = kC uye T1 = 100oC naT4 = 20oC wobva waisa tembiricha T2 uye T3 iri…
A. T 2 = 54,26 o C, T 3 = 31,4 o C
B. T 2 = 31,4 o C, T 3 = 54,26 o C
C. T 2 = 32,4 o C, T 3 = 54,26 o C
D. T 2 = 56,26 o C, T 3 = 31,4 o C
E. T 2 = 54,26 o C, T 3 = 30,4 o C
Kukurukurirana
Zvinozivikanwa kuti:
T 1 = 100 o C
T 4 = 20 o C
4 k A = 2 k B = k C
Kana k C = 4, k B = 2, k A = 1
Akabvunzwa: T 2 na T 3
Mhinduro:
Nzira yekufambisa kupisa nekufambisa:
Information :
Q/t = mwero wekufambisa kupisa, k = kutenderera kwekupisa, A = nzvimbo yepakati, T 1 = tembiricha yekutanga, T 2 = tembiricha yekupedzisira, l = kureba kwetsvimbo.
Kureba (l) nenzvimbo yechikamu (A) zvakaenzana saka zvinobviswa mu equation.
Shandisa equation iyi kuverenga tembiricha.
Funga nezvesimbi dzesimbi A neB.
Funga nezvesimbi dzesimbi B naC.
Bvisa equation 1 ne equation 2:
Verenga T 2 uchishandisa equation 1:
Mhinduro chaiyo ndiA.
Kwakabva mubvunzo:
Mibvunzo yeNational Examination Physics yeChikoro Chesekondari/Chikoro Chepamusoro Chebasa
