Using the picture added Q4, work out the hydrostatic force applied to AB when the water level is at 9cm and 12.8cm. 50g of weight was added to balance the setup. And 260g and 460g were used respectively. width of container was 75mm Also need the moments Heres what ive done F when level of water is 9cm = 0.09^2 x 0.075 x 9.81 x 1000 = 5.95N Acting at 2/3 of height so 30mm or 172 from the centre. total moment = (260 x 9.81) x202 = 515Nmm I would use the same principal for the 12.8cm but i think that is totally wrong due to the curve in the apparatus. Can anyone help?