Mienzaniso mina yemibvunzo chaiyo yekupisa uye kugona kupisa
1. Ndeipi inopisa nekukurumidza kana yaoma pamwe chete muzuva rinopisa, aruminiyamu kana mhangura? Kupisa kwearuminiyamu = 900 J/kg o C uye kupisa kwearuminiyamu = 390 J/kg o C.
Kukurukurirana
Kupisa kwechinhu kwakakura, zvinotora nguva yakareba kuti chinhu chidziye, asi, kupisa kwechinhu kudiki, ndiko kukurumidza kupisa kwacho.
Kupisa kwemhangura kwakadzama kudiki pane kupisa kwearuminiyamu, saka mhangura inopisa nekukurumidza.
2. Chinhu chine huremu hwe2 kg chinotora macalorie zana ekupisa kana tembiricha yacho ikachinja kubva pa20 o C kusvika pa70 o C. Kupisa kwechinhu chacho ndekwekuti...
Kukurukurirana
Zvinozivikanwa kuti:
Huremu (m) = 2 kg = 2000 gr
Kupisa (Q) = 100 cal
Kuchinja kwetembiricha (Δ T) = 70 o C – 20 o C = 50 o C
Akabvunzwa: Kupisa kwechinhu chacho (c)
Mhinduro:
c = Q / m Δ T
c = 100 cal / (2000 gr)(50 o C)
c = 100 cal / 100.000 gr o C
c = 10 2 cal / 10 5 gr o C
c = (10 2 cal)( 10 -5 gr -1 o C -1 )
c = 10 -3 macalorie gr -1 o C -1
c = 10 -3 cal/ gr o C
Kupisa kwechinhu chacho ndekwe 10 -3 cal/gr o C
3. Kupisa kwemvura chaiyo i4180 J/kg Co2 . Kukwanisa kupisa kwe2 kg yemvura ndiko…..
Kukurukurirana
Zvinozivikanwa kuti:
Kupisa kwemvura chaiyo (c) = 4180 J/kg C o
Huremu (m) = 2 kg
Yabvunzwa: Kukwanisa kupisa (C)
Mhinduro:
C = mc
C = (2 kg)(4180 J/kg Co )
C = (2)(4180 J/ Co )
C = 8360 J/C o
4. Kupisa kwearuminiyamu chaiyo i900 J/kg C o . Kukwanisa kupisa kwe2 gramu yearuminiyamu ndiko…..
Kukurukurirana
Zvinozivikanwa kuti:
Kupisa kwakananga kwearuminiyamu (c) = 900 J/kg C o = 9 x 10 2 J/kg C o
Huremu (m) = magiramu maviri = 2/1000 kg = 2/10 3 kg = 2 x 10 -3 kg
Yabvunzwa: Kukwanisa kupisa (C)
Mhinduro:
C = mc
C = (2 x 10 -3 kg)( 9 x 10 2 J/kg C o )
C = 18 x 10 -3 x 10 2 J/C o
C = 18 x 10 -1 J/C o
C = 1,8 J/C o
