Ukushisa okukhethekile kanye nomthamo wokushisa - izinkinga nezixazululo

1. Umzimba onesisindo esingama- 2 kg umunca ama-calories ayi-100 okushisa uma izinga lokushisa lawo likhuphuka lisuka ku -20 ^o C liye ku-70 o ^C. Kuyini ukushisa komzimba okuqondile ?

Kwaziwa:

Isisindo (m) = 2 kg = 2000 gr

Ukushisa ( Q) = 100 kcal

Ushintsho lokushisa ( ΔT ) = 70 ^o C – 20 ^o C = 50 ^o C

Okufunwayo: Ukushisa okuthile (c)

Isixazululo:

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 komzimba okuqondile kungu ^-10-3 cal /gr ^o C

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2. Ukushisa kwamanzi okuqondile kungu- 4180 J/kg Co. ^Umthamo wokushisa ongakanani wamanzi angu-2 kg …

Kwaziwa:

Ukushisa okuthile (c) = 4180 J/kg C ^o

Isisindo (m) = 2 kg

Okufunekayo: Umthamo wokushisa (C)

Isixazululo:

C = mc

C = (2 kg)(4180 J/kg ^Co )

C = (2)(4180 J/ ^Co )

C = 8360 J/C ^o

3. Ukushisa okukhethekile kwe-aluminiyamu kungu- 900 J/kg Co2 ^. Ungakanani umthamo wokushisa we -aluminiyamu engu-2 gram…..

Kwaziwa:

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

Okufunekayo: Umthamo wokushisa (C)

Isixazululo:

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

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1. Ukuguqula izikali zokushisa
2. Ukunwetshwa komugqa
3. Ukwandiswa kwendawo
4. Ukunwetshwa kwevolumu
5. Heat
6. Okulingana nokushisa okwenziwe ngomshini
7. Ukushisa okukhethekile kanye nomthamo wokushisa
8. Ukushisa okucashile, ukushisa kokuhlanganiswa, ukushisa kokushisa komhwamuko
9. Ukonga amandla okudlulisa ukushisa