1)V=mp=0,2*2700кг/м3=540
2)<span>k=F/х=25H/2=12.5</span>
<span>3)p=gph=9.8*710*0.5=3479</span>
<span>4)<span>1000*9,8*4,8/240 - 4.8*9.8 = 148,96Н. </span></span>
<span><span>5)4кВт=4000Вт</span></span>
<span><span> h=15</span></span>
<span><span> t=2мин=120сек</span></span>
<span><span> g=10H/кг</span></span>
<span><span> m=?</span></span>
<span><span> m=4000*120/10*15=480000/150=3200кг=3.2т</span></span>
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