(a) Show by means of a diagram how the centre of gravity of the liquid in a partly filled tank moves during rolling (6)

(b) The centre of gravity of a ship of 5000 tonnes displacement is 6m above the keel and 1.5m forward of midships. Calculate the new position of the centre of gravity if 500 tonnes of cargo are placed in the tween decks 10m above the keel and 36m aft of midships (10)