Izibonelo ezi-4 zemibuzo ethile yokushisa kanye nomthamo wokushisa
1. Yikuphi okushisa ngokushesha uma komiswa ndawonye elangeni elishisayo, i-aluminium noma ithusi? Ukushisa okukhethekile kwe -aluminium = 900 J/kg o C kanye nokushisa okukhethekile kwethusi = 390 J/kg o C.
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Uma ukushisa okuthile kwento kukhulu, kuthatha isikhathi eside ukuthi into ifudumale, ngokuphambene nalokho, uma ukushisa okuthile kwento kuncane, kushesha ukufudumala.
Ukushisa okuqondile kwethusi kuncane kunokushisa okuqondile kwe-aluminium, ngakho-ke ithusi lishisa ngokushesha.
2. Into enesisindo esingu-2 kg imunca amakhalori ayi-100 okushisa lapho izinga lokushisa layo lishintsha kusuka ku-20 o C kuya ku-70 o C. Ukushisa okuthile kwale nto...
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Kuyaziwa ukuthi:
Isisindo (m) = 2 kg = 2000 gr
Ukushisa (Q) = 100 cal
Ukushintsha kwezinga lokushisa (ΔT ) = 70 o C – 20 o C = 50 o C
Kubuziwe: Ukushisa okuthile kwento (c)
Impendulo:
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 amakhalori gr -1 o C -1
c = 10 -3 cal/ gr o C
Ukushisa okuthile kwale nto kungu-10 -3 cal/gr o C
3. Ukushisa kwamanzi okuqondile kungu-4180 J/kg Co2 . Amandla okushisa angama-2 kg amanzi…..
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Kuyaziwa ukuthi:
Ukushisa kwamanzi okuqondile (c) = 4180 J/kg C o
IMisa (m) = 2 kg
Kubuziwe: Umthamo wokushisa (C)
Impendulo:
C = mc
C = (2 kg)(4180 J/kg Co )
C = (2)(4180 J/ Co )
C = 8360 J/C o
4. Ukushisa okukhethekile kwe-aluminiyamu kungu-900 J/kg Co2 . Amandla okushisa angamagremu ama-2 e-aluminiyamu…..
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Kuyaziwa ukuthi:
Ukushisa okukhethekile kwe-aluminium (c) = 900 J/kg Co = 9 x 10 2 J/kg Co
Isisindo (m) = 2 amagremu = 2/1000 kg = 2/10 3 kg = 2 x 10 -3 kg
Kubuziwe: Umthamo wokushisa (C)
Impendulo:
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
