How to Calculate Power Generated by Niagara Falls - Help with Power Problem

[anonymous820]

Homework Statement

water flows over a section of niagara falls at the rate of 1.2*10^6 kg/s (kilograms per second) and falls 50.0 m (meters). How much power is generated by the falling water?

Homework Equations

--none.

The Attempt at a Solution

gravitational potential energy (PE grav)=mgh (mass*gravity*height)
PE grav=(1.2*10^9 g/s)(9.81)(50.0 m)
PE grav=588,600,000,000

but PE is measured in joules. and power is measured in watts. so how do i get from PE to W?

 

[Bill Foster]

1 Watt = 1 Joule per second

 

[hage567]

You were given the rate in the question. Look at the units in your calculation.