hydrostatics- bouyancy-need volume of submerged block- confused 1. The problem statement, all variables and given/known data Need help with #11 attached tank has 2m of water gate is 1 m wide pulley is 1/2 m above water specific weight of concrete is 23.6 kN/m3 need to find voulme of water to keep gate closed 2. Relevant equations Bouyant force= volume x specific weight Force= specific weight x area x centroid height 3. The attempt at a solution Force on gate is: Force= specific weight x area x centroid height 9810 N/M x 1m2 x 1/2 m force on gate + Bouyant force + weight of concrete= 0 I've got: (9810 N/M x 1m2 x 1/2 m) - (23.6 kN/m3 x volume)+ weight of concrete=0 not sure where to get weight of concrete? do I count the weigh of the water above? does the height of the pully have to be considered?