- #1

- 18

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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!

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- Thread starter psingh
- Start date

- #1

- 18

- 0

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

- #2

- 107

- 0

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

Homework Helper

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Does that make the question easier?

- #4

- 18

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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

Homework Helper

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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

- 18

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oo thanks alot i got it now =]

- #7

HallsofIvy

Science Advisor

Homework Helper

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mezarashi said:g = 9.79 meters per second per second

Not 9.81? Where do you live?

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.

Well, volume

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

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