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once i convert hp to watts i mult. by the .009 and divide that value by the watts buts i get it wring. how should i solve this?
Helium (He), a monatomic gas, fills a 0.009 m3 container. The pressure of the gas is 6.30 105 Pa. How long would a 0.25 hp engine have to run (1 hp = 746 W) to produce an amount of energy equal to the internal energy of this gas?
2 Answers
- Steve4PhysicsLv 76 years agoFavorite Answer
The total internal energy is U = (3/2)nRT (e.g. see link)
Since PV = nRT (ideal gas equation):
U = (3/2)PV
= (3/2) x 6.30x10⁵ x 0.009
= 8505J
P = 0.25hp = 0.25x746 = 186.5W
t = U/P = 8505/186.5 = 46s approx.
Source(s): /question/index?qid=20091...
