# Calc rate problem

by Okie
Tags: calc, rate
 P: 81 That can be simplified but, yes, I think it is correct. I have trouble reading the formula like that so... $$\frac{dP}{dt} = \frac{-1.4P\frac{dV}{dt}}{V}$$ Now that you have an equation that relates the rates, the problem is figuring out what these values are from the problem. You solved for dP/dt and I'm not sure why, but it stills works. The problem asks for the rate at which volume is changing, and it gives you a volume, pressure, and a rate at which pressure is changing. Your new equation has 4 variables, Pressure, Volume, the rate at which Pressure changes, and the rate at which Volume changes. Plug in your known variables and solve the problem.