Berapakah kalor yang dibutuhkan untuk memanaskan sebatang besi yang massanya \( 5 \mathrm{~kg} \) dari suhu \( 50^{\circ} \mathrm{C} \) menjadi \( 120^{\circ} \mathrm{C} \) jika kalor jenis 460 \( \mathrm{J} / \mathrm{kg}^{\circ} \mathrm{C} \) ? Kalor yang diperlukan untuk merebus air sehingga suhunya naik \( 30^{\circ} \mathrm{C} \) adalah \( 630 \mathrm{KJ} \). Jika kalor jenis air \( 4200 \mathrm{~J} / \mathrm{kg}^{\circ} \mathrm{C} \), berapakah massa air? Suhu mula-mula dari 5 kg air adalah \( 15^{\circ} \mathrm{C} \) dipanaskan dengan membutuhkan kalor \( 735 \mathrm{KJ} \). Dan kalor jenis air \( 4200 \mathrm{~J} / \mathrm{kg}^{\circ} \mathrm{C} \), berapakah suhu akhir air tersebut?
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