a) If you want to keep you cup of coffee as warm as possible when you drink it, should you add the cold cream right away after you pour the coffee, or should you wait until you are ready to drink it and then add the cold cream? Explain why you picked your answer. b) When I pour 22 ounces of hot tea at 80 degrees C into thermos bottle, it take 6 hours for the tea to reach room temperature at 25 C. What is the average rate at which heat escapes from the thermos bottle per second, per minute and my per hour?

a) If you want to keep you cup of coffee as warm as possible when you drink it, should you add the cold cream right away after you pour the coffee, or should you wait until you are ready to drink it and then add the cold cream? Explain why you picked your answer. b) When I pour 22 ounces of hot tea at 80 degrees C into thermos bottle, it take 6 hours for the tea to reach room temperature at 25 C. What is the average rate at which heat escapes from the thermos bottle per second, per minute and my per hour?