573_Physics ProblemsTechnical Physics

573_Physics ProblemsTechnical Physics - 20 Heat and the...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
20 CHAPTER OUTLINE 20.1 Heat and Internal Energy 20.2 Specific Heat and Calorimetry 20.3 Latent Heat 20.4 Work and Heat in Thermodynamic Processes 20.5 The First Law of Thermodynamics 20.6 Some Applications of the First Law of Thermodynamics 20.7 Energy Transfer Mechanisms Heat and the First Law of Thermodynamics ANSWERS TO QUESTIONS Q20.1 Temperature is a measure of molecular motion. Heat is energy in the process of being transferred between objects by random molecular collisions. Internal energy is an object’s energy of random molecular motion and molecular interaction. Q20.2 The T is twice as great in the ethyl alcohol. Q20.3 The final equilibrium temperature will show no significant increase over the initial temperature of the water. Q20.4 Some water may boil away. You would have to very precisely measure how much, and very quickly measure the temperature of the steam; it is not necessarily 100 ° C. Q20.5 The fingers are wetted to create a layer of steam between the fingers and the molten lead. The steam acts as an insulator and can prevent or delay serious burns. The molten lead demonstration is
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

Ask a homework question - tutors are online