Originally Posted by

**Ackbeet** Hmm. DE's are often introduced in Calc II these days, at least the beginnings of them. I'm not sure I buy your answer, for two reasons.

1. The original problem says, "I have an object with an initial heat of h0. It loses heat at a **rate** of k*h^4 per second,..." When I see the word "rate", I think derivative.

2. Dimensional Analysis. Again, the quote reads, "I have an object with an initial heat of h0. It loses heat at a rate of k*h^4 **per second**,..." The units don't work out to have rate on the right-hand-side of the equation (with units of heat per second), and just heat on the left-hand-side.