October 2018 2 59 Report
Besi 0,4 kg dipanaskan menghabiskan kalor sebesar 9.000 J. Jika kalor jenis besi 450 J/kg°C dan suhu akhir besi 70°C,maka suhu mula mula besi tersebut adalah
a.20°C
b.50°C
c.90°C
d.120°C
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