Physics Thermodynamics Test 1. A sealed glass container holds molecules of nitrogen gas that are increasing in 3. Which of the following statements best velocity. Which of the following is most explains why there is no change in likely causing the nitrogen molecules to temperature once thermal equilibrium move faster? between two objects in contact is reached? A The molecules are forming bonds B with each other. A Heat cannot flow between two objects in contact unless both Heat is being transferred to the molecules. objects are very hot. C B Heat exchange requires a difference The volume of the container is in temperature between the objects. expanding. D C Heat does not flow spontaneously Pressure within the container is from a cooler object to a warmer decreasing. object if those objects are in contact. Heat flows by conduction, convection, 2. and radiation when the temperatures Which of the following is an example of of two objects are the same. the transfer of energy through convection? bone9 A In a two story house the top floor is usually warmer than the first floor. B A parking lot increasing in temperature during the day. C The filaments within a toaster burn Sweivey orl) ob way bid . a piece of bread. D Energy passes from a hot coffee cup into a person's hand. wolver self ob of don seora boy il wov bid Q R S T 25C 10 C orb boy ll 35.C 50 C Four spheres composed of the same metal have been heated to different temperatures and 4. placed in a petri dish. The temperature of the air surrounding the spheres is 18 C. After 10 minutes at room temperature, which sample will have experienced the greatest change in temperature? ybutz of jon seorb boy !I A