Question

Rank the buoyant forces exerted on the following five objects of equal volume from the largest to the smallest. Assume the objects have been dropped into a swimming pool and allowed to come to mechanical equilibrium. If any buoyant forces are equal, state that in your ranking. 

(a) a block of solid oak

(b) an aluminum block

(c) a beach ball made of thin plastic and inflated with air

(d) an iron block

(e) a thin-walled, sealed bottle of water