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m=ro * v
m= 7,8 kg/m^3 * 4000cm^3
m=31200g
Q=mg
Q= 31200g * 0,01N/g
Q=312N
Fw= 1g/cm^3 * 4000cm^3 * 0,01N/g
Fw= 40N
Fx=312N - 40N
Fx=272 N