# Math Help - Help!

1. ## Help!

two dams form artical lakes of equal depth. however one lake backs up 15 km behind the dam, and the other backs up 30 km behind. what effect does the difference in length have on the pressures on the dams?

2. Originally Posted by Mohycha
two dams form artical lakes of equal depth. however one lake backs up 15 km behind the dam, and the other backs up 30 km behind. what effect does the difference in length have on the pressures on the dams?
Length does nothing. The pressure formula is $P = P_0 + \rho gd$ where P0 is the pressure at the surface and d is the depth. This formula does not use the length of the container, so the length affects nothing.

-Dan