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P = F/A
P = m.g / A
P = 27.10 / 30.10^-4
P = 9X 10^4 = 90.000 Pa
m = 27 kg
A = 30 cm2 = 10.10^-4 m2
ditanya: P 2roda
P= 2F/A = 2mg/A = 2.27.10/(10^-3) = 540000 N/m2