A train is traveling at 5.00 X 10^1 meters per second. The resistance between the train and the track is 73.0 newtons. If air resistance can be ignored, determine the horsepower needed to power the engine.
2006-09-23 06:34:21 · 3 answers · asked by Johnny 3 in Science & Mathematics ➔ Physics
Power is a measure of how much work is done within some timeframe. HP is just an imperfect unit of that power, which is better measured via the Watt unit. One Watt = Joule/second = Newton-Meter/second; where Joule is the work unit, Newton is the force unit, and meter measures distance. As a rough equivalence, use 750 watts per HP...given that HP is imperfact, that's certainly close enough for government (and most other) work.
HP is an imperfect measure because there are several definitions of horsepower. (See source.) The fact you are looking for an answer in HP makes me wonder how up to date your textbook might be.
Anyway, work your problem this way Force X Velocity/750 = HP.
2006-09-23 07:32:11 · answer #1 · answered by oldprof 7 · 0⤊ 0⤋
Power = Force x Velocity
Force is the resistance, so the power is
50m/s x 73 N
2006-09-23 13:44:28 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I normally only find horsepower from a horse is there another way now? wow I must get out more often
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2006-09-23 13:53:23 · answer #3 · answered by fawcett1101 2 · 0⤊ 0⤋