Mehlala e 4 ea lipotso tse itseng tsa mocheso le bokhoni ba mocheso
1. Ke eng e futhumatsang kapele ha e omiswa hammoho letsatsing le chesang, aluminium kapa koporo? Mocheso o ikgethang wa aluminium = 900 J/kg o C mme mocheso o ikgethang wa koporo = 390 J/kg o C.
Puisano
Ha mocheso o itseng wa ntho o le moholo, ho nka nako e telele hore ntho e futhumale, ka lehlakoreng le leng, ha mocheso o itseng wa ntho o le monyane, o futhumala kapele.
Mocheso o itseng oa koporo o monyane ho feta mocheso o itseng oa aluminium, ka hona koporo e chesa kapele.
2. Ntho e boima ba 2 kg e monya dikhalori tse 100 tsa mocheso ha mocheso wa yona o fetoha ho tloha ho 20 o C ho ya ho 70 o C. Mocheso o ikgethang wa ntho ke...
Puisano
Hoa tsebahala hore:
Boima (m) = 2 kg = 2000 gr
Mocheso (Q) = 100 cal
Phetoho ea mocheso (Δ T) = 70 o C – 20 o C = 50 o C
E botsitsweng: Mocheso o itseng wa ntho (c)
Karabo:
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 lik'hilojule gr -1 o C -1
c = 10 -3 cal/ gr o C
Mocheso o itseng oa ntho ke 10 -3 cal/gr o C
3. Mocheso o itseng oa metsi ke 4180 J/kg Co2 . Bokhoni ba mocheso ba 2 kg ea metsi ke…..
Puisano
Hoa tsebahala hore:
Mocheso o itseng oa metsi (c) = 4180 J/kg C o
Boima (m) = 2 kg
E botsitsweng: Bokgoni ba mocheso (C)
Karabo:
C = mc
C = (2 kg)(4180 J/kg Co )
C = (2)(4180 J/Co o )
C = 8360 J/C o
4. Mocheso o itseng oa aluminium ke 900 J/kg Co2 . Bokhoni ba mocheso ba ligrama tse 2 tsa aluminium ke…..
Puisano
Hoa tsebahala hore:
Mocheso o itseng oa aluminium (c) = 900 J/kg Co = 9 x 10 2 J/kg Co
Boima (m) = 2 dikgerama = 2/1000 kg = 2/10 3 kg = 2 x 10 -3 kg
E botsitsweng: Bokgoni ba mocheso (C)
Karabo:
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
