# Output rating (watts)

1. Dec 14, 2008

### Bayley

1. The problem statement, all variables and given/known data
A pump is to lift 8.00 kg of water per minute through a height of 3.50 m. What output rating (watts) should the pump motor have?

2. Relevant equations

3. The attempt at a solution
I have no idea how to even start.

2. Dec 14, 2008

### Hootenanny

Staff Emeritus
Welcome to Physics Forums,

Which concept(s) do you think are involved?

3. Dec 14, 2008

### harvellt

Well think about what a Watt is. It is a J/s.

4. Dec 14, 2008

### Bayley

Well energy is measured in joules and work=fdcosΘ. So...

5. Dec 14, 2008

### Hootenanny

Staff Emeritus
Good, you're on the right lines. How much work does the pump have to do in one minute?

6. Dec 14, 2008

### Bayley

I dont know what the components are.
I'm so clueless about this because my teacher didnt have time to teach us, and he said just try and figure it out.

7. Dec 14, 2008

### Hootenanny

Staff Emeritus
Well, in one minute the pump lifts a mass of 8kg vertically upwards to a height of 3.50m...