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F=10kg×10m/s²
F=100N ,ciężar w powietrzu
F₁=ρVg , siła wyporu
F₁=1000kg/m³×0,00008m³×10m/s²
F₁=0,8N
F₂=100N-0,8N=99,2N
dane V=80cm3, m=10kg, d=1g/cm3=1kg/dm3 g=10m/s2=10N/kg
szukane ciężar pozorny Q"
Q" = Q - Fw.......Q=mg......Fw=d*g*V
Q" = 10kg*10N/kg - 1kg/dm3 *10N/kg *0,08dm3 = 100N - 0,8N = 99,2N
.............................pozdrawiam