( ( ( The question ) ( of ( why ( ( some objects ) ( ( sink ( in fluids ) ) ( while ( others float ) ) ) ) ) ) ) ( ( can ( be ( answered ( using ( ( the law ) ( of buoyancy ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN question)) (PP (IN of) (SBAR (WHADVP (WRB why)) (S (NP (DT some) (NNS objects)) (VP (VB sink) (PP (IN in) (NP (NNS fluids))) (SBAR (IN while) (S (NP (NNS others)) (VP (VBP float))))))))) (VP (MD can) (VP (VB be) (VP (VBN answered) (S (VP (VBG using) (NP (NP (DT the) (NN law)) (PP (IN of) (NP (NN buoyancy))))))))) (. .)))
The question of why some objects sink in fluids while others float can be answered using the law of buoyancy.
(ROOT (S (NP (NP (NNP Archimedes) (POS ')) (NN law)) (VP (VBZ explains) (NP (SBAR (WHADVP (WRB why)) (S (NP (DT some) (NNS objects)) (VP (VBP float)))) (CC and) (NP (DT some) (NN sink))))))