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r=6cm=0,06m
1HPa=100Pa
1kPa=1000Pa
powierzchnia dna wazonu S=πr²=3,14*0,06*0,06=0,011304m²
ciśnienie p=F/S
p=30N/0,011304m²=2653,93Pa=26,53hPa=2,653kPa