Sebuah balok tembaga berukuran panjang 25 cm , lebar 20 cm , tinggi 2 cm , massa jenis 8400 kg /m3 , massa balok....
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V = 25 x 20 x 2
V = 1000cm = 1 m³
massa jenis (p)/rho
rho(p) = massa / volume
8400 = x / 1
x = 8400 . 1
x = 8400 kg