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140cm^2=140*0,01*0,01[m^2]=0,014m^2
p=500N/0,014m^2≈35714Pa
P=F/S
P - ciśnienie
F - siła nacisku
S - Pole powierzchni
P= 500N/140cm²
P~=3,57 Pa
Odp. Wywiera ciśnienie 3,57 hPa