# hw_4 - MS&E 303 Fall 2004 Homework#4 Due Friday September...

This preview shows pages 1–2. Sign up to view the full content.

MS&E 303 – Fall 2004 Homework #4 – Due Friday September 25 1. You are in charge of the keg for the beach party during spring break. The social chair has tasked you with spending the absolute minimum on anything but the beer – so you cannot use anything but ice to keep the beer cool during the day. It’s a brisk 35 o C on the beach and you are not allowed to let the beer temperature rise above 5 o C. (i) What is the minimum number of kilograms of ice you must buy in order to keep the keg below 5 o C from 10:00 a.m. to 5:00 p.m.? (ii) Plot the temperature of the beer as a function of time during the day. For the purposes of this problem, you may assume: the beer is a half keg of Molson holding 15.5 gallons (165 12 oz glasses) undergraduates don’t actually drink, so the keg remains full throughout the day (for challenge credit, assume that it is consumed uniformly throughout the day). heat conduction into the keg from the sun and air is constant throughout the day at 150 J/s. beer may be approximated as pure water The beer and ice are initially at 0 o C (just above freezing). The beer and ice are always at the same temperature. Take c P for water and ice as constants (though not the same constants).

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern