(a) Explain in brief the term 'bulwark' and 'freeing port'. (6)

(b) A ballast tank is 15 m long, 1.2 m wide and 1.4 m deep and is filled with fresh water.

Calculate the load on the top and short side, if: (10)

(a) The tank is just completely full

(b) There is a head of 7m of water above the tank top.