This is out of a P3 (OCR) text book so it should be dead easy but I just can't see the answer. I know it is not a simple ln(N(500-N)) because the differential is not on top. Anyway here it is:(adsbygoogle = window.adsbygoogle || []).push({});

(5000)dN/dt=N(500-N)

they also say when N = 100, dN/dt = 8 (which is obvious)

the answer in the back of the book is:

t=(10)ln(N/(500-N))+k

Cheers

**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!

# A Differential Equation

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