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r = 8 cm = 0,08 m
m = 0,4 kg
Ditanyakan : P ?
Dijawab :
F = m x g = 0,4 x 10 = 4 N
A = 0,08 x 0,08 = 0,0064 m²
Jadi Tekanan :
P = F/A
= 40/0,0064
= 625 N/m²