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P=F/S
1 litr wody to 1 kg, 1 kg to 10 N
P=10N/50m^2=0,2 Pa
2) mamy 2 stopy więc 100 * 2=200 cm2, 200cm2=0,2 m2
P=800N/0,2m^2= 4000 Pa=4 kPa
3)
P~F
P~1/S