1 .Sebuah mesin carnot mula-mula dioperasikan dengan suhu kedua tandon masing-masing 300K dan 400K. agar efisiensinya naik menjad 2x semula, maka dengan suhu rendah tetap, suhu tandon kaloryang bersuhu tinggi harus dinaikkan menjadi ?
2.Suatu mesin carnot dengan efisiensi 60% dioperasikan antara 2 reservoir kalor, reservoir bersuhu rendah 27°C. agar mesin carnot tersebut daya gunanya menjadi 80% maka diperlukan kenaikan suhu reservoir kalor bersuhu tinggi sebesar ? *Trims*
η = (1-T/T) . 100%
= (1-300/400) . 100%
= 0,25 . 100%
= 25 %
2η = 50%
50% = (1-300/X) . 100%
0,5 = (x-300)/x
0,5x = x -300
300 = 0,5 x
x = 600 K
Kenaikan suhu tinggi = 600-300 = 300 K
2. T = 27 + 273 = 300
η = (1-T/T) . 100%
60% = (1-300/x) . 100%
0,6 = (x-300)/x
0,6x = x -300
300 = 0,4x
750 K
η = (1-T/T) . 100%
80% = (1-300/x) . 100%
0,8 = (x-300)/x
0,8x = x -300
300 = 0,2x
1500 K
Maka kenaikannya 1500-750 = 750 K
:)
Diketahui:
Tr1= Tr2=300 K
Tt1= 400 K
n1= 1x
n2 = 2x
Ditanya: Tt2 . .. . ? ? ?
Jawab
n1 = (1-(Tr/Tt1)) * 100%
n1 = (1-(Tr/Tt1)) * 100 %
n1 = (1-(Tr/Tt2)) * 100 (hilangkan % untuk memudahkan penghitungan)
n1 =1-(300/400) *100
n1/100 = 1- (3/4)
n1/100 =1/4 (daikali silang)
100 =4n1
n1 =25 %
n2= 2n1
n2= 2 x 25= 50 %
n2 = (1-(Tr/Tt2)) x 100%
50% = (1-(Tr/Tt2)) x 100%
50 = (1 - (Tr/Tt2)) x 100
50/100 = 1 - (300 / Tt2)
1/2 =1 - (300 / Tt2)
300 / Tt2 =1- 1/2
300 / Tt2 = 1/2
Tt2 = 300 x 2
Tt2 = 600 K
2.
Diketahui:
n1 = 60%
Tr1 =Tr2= 27C= 300 K
n2 =80 %
Ditanya: dTt . . . ?
Jawab
n1 = (1-(Tr/Tt1)) x 100%
60% = (1-(Tr/Tt1)) x 100 %
60 = (1-(Tr/Tt1)) x 100
60/100 =(1-(Tr/Tt1))
6/10 =1-(300/Tt1)
300/Tt1 =1-6/10
300/Tt1 = 4/10
4 Tt1 =3000
Tt1 =750 K
n2 = (1-(Tr/Tt2)) x 100%
80% = (1-(Tr/Tt2)) x 100 %
80 = (1-(Tr/Tt2)) x 100
80/100 = 1-(300/Tt2)
300/Tt2 =1-80/100
300/Tt2 =2/10
2 Tt2 =3000
Tt2 =1500 K
dTt=Tt2-Tt1
dTt=1500-750
dTt= 750 K