i have a physics question here... so you have a cup og hot coffee and u want cream in it, but your not going to be drinking the coffee for a little while. if i wanted the coffee to stay the hottest, should i put the cream in now or when i wanted to drink it? explain it... they give the equation ΔQ=KΔT my guess it to put the cream in when ur ready to drink it, b/c the ΔT will be much less, but im not sure how to explain/prove it.