( ( ( Another ( common unit ) ) ( for power ) ) ( ( is ( ( ( ( the horsepower ) ( -LRB- ( HP -RRB- ) ) ) , ) ( which ( ( is ( ( the amount ) ( of work ) ) ) ( that ( ( an ( average horse ) ) ( can ( do ( per second ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT Another) (JJ common) (NN unit)) (PP (IN for) (NP (NN power)))) (VP (VBZ is) (NP (NP (NP (DT the) (NN horsepower)) (PRN (-LRB- -LRB-) (NP (NNP HP)) (-RRB- -RRB-))) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN work)))) (SBAR (IN that) (S (NP (DT an) (JJ average) (NN horse)) (VP (MD can) (VP (VB do) (PP (IN per) (NP (NN second)))))))))))) (. .)))
Another common unit for power is the horsepower (HP), which is the amount of work that an average horse can do per second.
(ROOT (S (NP (DT A) (NN horsepower)) (VP (VBZ is) (ADJP (JJ equal) (PP (TO to) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN work)))))) (SBAR (S (NP (DT a) (NN horse)) (VP (MD can) (VP (VB do) (PP (IN in) (NP (CD 1) (NN minute)))))))) (. .)))