1) F=mg; F=P×S; P×S=m×g; m=P×S/g=
=400000×0.12/9.81=4893 кг = 4.9 т
2) P= r×g×h = 1000×9.81×75=735750 Па= 735.8 кПа
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1) F=mg; F=P×S; P×S=m×g; m=P×S/g=
=400000×0.12/9.81=4893 кг = 4.9 т
2) P= r×g×h = 1000×9.81×75=735750 Па= 735.8 кПа