(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Assuming that the rate of the mass (m) of an object is proportional to its total surface area, derive a D.E for the rate of change in the mass. Arbitrary constants may be included.

The objects in question are expanding peat discs. The discs absorb water through their surface which causes an increase in height (but the radius and density remain constant).

2. Relevant equations

None

3. The attempt at a solution

No idea...

Not even sure where to start? dm/dt = ...?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Deriving a Differential Equation

**Physics Forums | Science Articles, Homework Help, Discussion**