# Easy D.e?

• January 25th 2009, 12:35 PM
Scopur
Easy D.e?
Water leaks from a tank through a hole at the base proportional to the square root of the volume of the water remaining. The tank has initially 400 liters and 23 liters leak out during the first day.

When will the tank be half empty?

Am i setting this equation up correctly? I think im being dumb..

For V= volume in tank

$dV/dt=-sqrt(V)$
• January 25th 2009, 12:50 PM
Mush
You must include a constant of proportionality. It says it is proportional, but it does not say what the proportion is.
• January 25th 2009, 02:33 PM
Scopur
thanks... mind gap.