- #1

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im not sure what equation to use on this problem, so if anyone could let me know that would be good thanks!

- Thread starter psingh
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- #1

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im not sure what equation to use on this problem, so if anyone could let me know that would be good thanks!

- #2

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Power = Energy/Time

Energy = mgh in this case

1 hp = 745.8 Watts

Energy = mgh in this case

1 hp = 745.8 Watts

- #3

mezarashi

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Does that make the question easier?

- #4

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this is what i got so far but im completely not sure since its 2 hp..

745.8w*2*3600s= is the energy of the motor in 1 hour.

h= -10 or 10 depending on where u place your axis

g= 9381

745.8w*2*3600=mgh? is that right?

- #5

mezarashi

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And hint about volume. The volume doesn't matter in this energy problem. Just know for later reference that 1000 liters of water = 1000 kg = 1 cubic meter.

- #6

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oo thanks alot i got it now =]

- #7

HallsofIvy

Science Advisor

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Not 9.81? Where do you live?mezarashi said:g = 9.79 meters per second per second

Well, volumeAnd hint about volume. The volume doesn't matter in this energy problem. Just know for later reference that 1000 liters of water = 1000 kg = 1 cubic meter.

I presume you meant that since, for water, 1 litre is 1 kg, it's easy to convert.

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