m = 39кг F1+F2 = mg
p1 = 2600кг/м^3 F2 = mg-F1
F2-? F1 = p2gV
V = m/p1
p2 = 1000кг/м^3
V = 39кг/2600кг/м^3
V = 0.015м^3
F2 = mg-pgV
F2 = 39кг*10Н/кг-1000кг/м^3*10H/кг*0.015м^3
F2 = 240H
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Answers & Comments
m = 39кг F1+F2 = mg
p1 = 2600кг/м^3 F2 = mg-F1
F2-? F1 = p2gV
V = m/p1
p2 = 1000кг/м^3
V = 39кг/2600кг/м^3
V = 0.015м^3
F2 = mg-pgV
F2 = 39кг*10Н/кг-1000кг/м^3*10H/кг*0.015м^3
F2 = 240H
m=39кг
g≈10H/кг
F=mg
F=10*39=390H