р=10кПа= 10000Па
S= F/p = mg/p =>
S= 40×10/10000 = 0.04м^2 = 400см^2
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р=10кПа= 10000Па
S= F/p = mg/p =>
S= 40×10/10000 = 0.04м^2 = 400см^2