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2014-04-15T20:37:59+07:00
 V dlm air = 5000 cm3 . 75% = 3750 cm3

ρa . Va . g = ρ balok . Vbalok . g
1 . 3750 . 10 = ρ balok . 5000 . 10
37500 = ρ balok . 50000
ρ balok = 0,75 g/cm3

ρ balok = m balok / V balok
0,75 = m balok / 5000 cm3
m balok = 0,75 . 5000
= 3750 gram = 37,5 kg
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