M₁/m₂ =a₂/a₁ .................
P=h*P(ро)*g Па
p1=30*1000*9,8=294000 Па=294кПа
p2=143<span>*1000*9,8=14014000 Па=14014 кПа
p3=250*</span><span>1000*9,8=24500000 Па=24.5 мПа
F3=p3*S=</span><span>24500000*2.5=61250000 H=61250 kH</span>
X(t)=x(max)cos(2п*v*t) , x(t)=0.1cos(40п*t) , x(3п/4)=0.1* cos(1)=0.1м=10см