Thanks, you're amazing! By the way, for the pump water higher, how does it work, I still don't get that bit.
By the way, for the formula you're teacher told u is distance (s) = 0.5(u+v)t
Ivo the formula I wrote oh sh*t sorry it's distance=ut+.5at^2 (a is acceleration. Sorry for using mass! VERY VERY VERY VERY SORRY!!!) U see that's why I don't like to answer questions even if I know the answers. I'm afraid I might tell something wrong and it'll screw the guy I'm trying to help
.
Anyway, you see some hydroelectric stations have a pumped storage feature. See demand varies at different times and seasons bla bla bla. So when demand is less and u're producing more energy, you can use it to pump the water that goes out of the dam back up to a higher-level reservoir. My book claims that it's easier to do this than to reduce the output of the generator (who wants to stop running water
)..
So at peak times, the water will flow out again from the high level reservoir and the pe it has is converted to electrical energy. You can get 3-quarters of the electrical energy that was used to pump it back up in the first place.. (this answer is correct so it can be relied upon
)...