Problem 12.51-Enhanced-with Feedback Part A Brewed coffee is often too hot to dr
ID: 1788416 • Letter: P
Question
Problem 12.51-Enhanced-with Feedback Part A Brewed coffee is often too hot to drink right away You can cool it with an ice cube, but this dilutes it Or you can buy a device that will cool your coffee without dilution-a 300 g aluminum cylinder that you take from your freezer and place in a mug of hot coffee. If the cylinder is cooled to -20° C, a typical freezer temperature, and then dropped into a large cup of coffee (essentially water, with a mass of 500 g) at 85 C, what is the final temperature of the coffee? Express your answer using two significant figures You may want to review(LD pages 380-381 Submit My Answers Give UpExplanation / Answer
specific heat capacity of aluminum = 910(J/kgK)
assume T is the final temp.
910*300*(T+20) = 500*4200*(85-T).
so, T = 72.92 (deg).
Please rate my answer...