Originally Posted by
Jaydee Hello,
I have some review to work on over the holidays for grade 11 math. This year math and I haven’t been getting along as well as we usually do, however, and so I’m having some trouble with our review for our upcoming exam, and I really need to have some questions explained out for me as to how I can do them so that I can study them over the break. I’ve done most of them, but here is one that I’m having trouble with:
Coffee, at 95 C, is poured into a cup. After 2 minutes the coffee cools to 90 C. The room temperature is kept at 20 C. Assuming an exponential cooling curve, how long will it take for the coffee to reach 80 C?
I figured that the equation would look something like: 95(?)^t/? + 20
However I can’t figure out what goes in brackets and what is the denominator for the t. This is how we typically do cooling curves in class, though we’ve never had to write our own equations.
Any help would be much appreciated,
JD