p=F/S
S=0.2*0.3=0.06м²
F=P(вес)=mg=4*9.8=39.2Н
p=39.2/0.06≈653Па
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p=F/S
S=0.2*0.3=0.06м²
F=P(вес)=mg=4*9.8=39.2Н
p=39.2/0.06≈653Па