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B. Bentuk Energi .......................................................................... 58
C. Transformasi Energi ................................................................ 65
D. Hubungan Gaya, Gerak, dan Energi ......................................... 67
E. Pengaruh kalor terhadap perubahan wujud benda ................. 69
BAB IV BUNYI DAN CAHAYA ............................................................ 75
A. Bunyi ....................................................................................... 77
B. Cahaya .................................................................................... 81
BAB V SUMBER DAYA ALAM ........................................................... 93
A. SDA Dapat Diperbaharui ......................................................... 95
B. SDA yang Tidak Dapat Diperbaharui ........................................ 98
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