( ( In equilibrium ) ( ( the ( net ( heat exchange ) ) ) ( ( is zero ) . ) ) )
(ROOT (S (PP (IN In) (NP (NN equilibrium))) (NP (DT the) (JJ net) (NN heat) (NN exchange)) (VP (VBZ is) (NP (CD zero))) (. .)))
In equilibrium the net heat exchange is zero.
(ROOT (S (NP (DT A) (VBG moving) (NN car)) (VP (VBZ is) (VP (VBN said) (S (VP (TO to) (VP (VB be) (PP (IN in) (NP (JJ dynamic) (NN equilibrium))) (SBAR (WHADVP (WRB when)) (S (NP (PRP it)) (VP (VBZ is) (NP (CD zero) (JJ net) (NN force)))))))))) (. .)))