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m = 3,7 gr
d = 2,8 m
t = 0,3 cm
ditanya :
ρ = ?
jawab :
ρ = m/V
ρ = m/πR^2 h
ρ = 3,7/ (22/7 x 1,4x1,4x0,3)
ρ = 3,7 / 1,848
ρ = 2, 002 g/cm³ = 2002 kg/m³