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m per cincin = 1,8 gr
ada 120 cincin
v1 = 50 cm3
v2 = 80 cm3
Ditanyakan : massa jenis ?
Dijawab :
V = v2 - v1 = 80 - 50 = 30
m total = 120 x 1,8 = 216 gr
Jadi massa jenis :
ρ = m/V
= 216/30
= 7,2 gr/cm³