Physics 011

Quiz#14

# Chapter 14: Heat

 Chapter 14 Practice Problems

 1 A 0.5 kg mass of Aluminum at 0 degrees Celsius is put in 1 kg of water at degrees Celsius in a Calorimeter of negligible mass. What is the resulting temperature (to the nearest tenth of a Celsius degree) at equilibrium? 2 You are in a 2 cm thick down sleeping bag. Assuming your body temperature is 100 degrees Fahrenheit and the outside temperature is degrees Fahrenheit, how much heat, to the nearest Joule, do you lose through the bag in an hour? (Assume that the exposed area of the bag is 2 m^2.) 3 How much energy, to the nearest kcal, must be used to turn kg of ice (c=0.5 kcal/kg*C) at -50 degrees Celsius into steam (c=.5 kcal/kg*C) at 150 degrees Celsius? 4 A wall is made up of 5 cm of wood and 8 cm of brick. If the temperature difference across the wall is Celsius degrees,and the wall area is 10 m^2, how much heat, to the nearest Joule, is lost through the wall in 1 hour? 5 If the interior wood wall in problem 4) is 30 C, what is the temperature, to the nearest degree Celsius, of the wood/brick interface? 6 What is the internal energy of one mol of a monatomic ideal gas at Celsius (to the nearest Joule)? 7 If heat is added to the gas in problem 6) until its internal energy is doubled, what will be its new temperature to the nearest Celsius degree? 8 Assuming you have a body surface area of 2 m^2 ,temperature of 37 C, an emissivity of 1, and are surrounded by walls at a temperature of C,how much energy ,to the nearest Joule, do you lose in an hour by radiation exchange?