Exam Question

(a) Define Centre of Buoyancy and show with the aid of sketches how a vessel which is stable will return to the upright after being heeled by an external force (6)

(b) An oil tanker of 17000 tonne displacement has its centre of gravity 1m aft of midships and has 250 tonne of oil fuel in its forward deep tank 75m from midhships. This fuel is transferred to the after oil fuel bunker whose centre is 50m from midships. 200 tonne of fuel from the after bunker is now burned.

Calculate the new position of the centre of gravity (10)

(a) After the oil has been transferred

(b) After the oil has been used