find the apparent weight of a 18 cm by 12 cm by 6 cm block of concrete with a mass of 1.82 kg that is submerged under water.
volume is 18*12*6 = 1296cm^3
the mass of water displaced is thus 1.296kg
the apparent weight is thus g(1.82 - 1.30) = 9.8*.52 = 25.9N