Physics-Heat transfer (Thermodynamics) Exam Questions with Complete Solutions

The second law of thermodynamics states that - ANSWER-heat naturally transfers from bodies of higher temps to bodies of lower temps 3 types of heat transfer - ANSWER-1. Conduction 2. Convection 3. Radiation conduction - ANSWER-the transfer of heat into or through a material by direct molecular contact. generally best through solids conduction is the transfer of heat ______ or ______ a material by ________ ______ ______. generally best through _____ - ANSWER-into or through direct molecular contact solids when does conduction occur - ANSWER-when faster moving molecules in a higher temperature region of an object collide with and pass on some of their energy to the slower moving molecules in a lower temperature region of the object conduction occurs when ______ moving molecules in a ________temperature region of an object_________ with and _____ on some of their energy to the ______ moving molecules in a ______ temperature region of the object - ANSWER-faster higher collide pass slower lower molecules in higher temperatures have _____ kinetic energy than molecules in lower temperatures - ANSWER-more thermal conductivity (k) - ANSWER-the ability of a particular material to conduct heat what are the units for thermal conductivity - ANSWER-J/ (m *s *C) thermal conductors - ANSWER-materials that are good conductors of heat examples of good thermal conductors - ANSWER-metals diamond