1. m = 780кг; S = 2м²; p-?
p = F/S; F = mg; p = mg/S
<h3>p = 780*10/2 = 3,9кПа</h3>
2. F = 20Н; S = 0,1мм² = 10^-7м²; p-?
<h3>p = F/S; p = 20/10^-7 = 0,2ГПа</h3><h3>3. S = mg/p; 0,312м²</h3><h3>4. p = ρgh; 17040Па </h3><h3>5. h = p/ρg; 0,3м</h3><h3>6. F = ρghS; 672кН</h3>