Tembaga 0,5 kg di beri kalor sebesar 30 kj.Jika suhu awal tembaga 20°C,berapa suhu akhir tembaga setelah diberi kalor ?(C=390J/kgC°)
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30000=0,5×390(t2-20)
30000=195(t2-20)
30000=195t2-3900
33900=195t2
t2=173,8°C