Jawabanmu

2014-07-07T16:14:06+07:00
V = 4/3 . π . r³
V = 4/3 . π . (0,05)³
V = 5/3 . π . 10⁻⁴

ρ = m/v
= 0,5 / (5/3 . π . 10⁻⁴)
= 3 . 10³ π kg/m³

:)
2014-07-07T17:28:21+07:00
V bola = 4/3 πr³
          = 4/3 (3.14 x (5x10⁻²)³)
          = 5.23 x 10⁻⁴

ρ = m/V
   = 0.5 / 5.23 x 10⁻⁴
ρ = 956 kg/m³