Solution Found!
Solved: The entropy of a hot baked potato decreases as it
Chapter 7, Problem 77C(choose chapter or problem)
An insulated piston–cylinder device initially contains 300 L of air at and . Air is now heated for 15 min by a 200-W resistance heater placed inside the cylinder. The pressure of air is maintained constant during this process. Determine the entropy change of air, assuming (a) constant specific heats and (b) variable specific heats.
Questions & Answers
QUESTION:
An insulated piston–cylinder device initially contains 300 L of air at and . Air is now heated for 15 min by a 200-W resistance heater placed inside the cylinder. The pressure of air is maintained constant during this process. Determine the entropy change of air, assuming (a) constant specific heats and (b) variable specific heats.
ANSWER:
Step 1 of 8
An insulated cylinder initially contains air at a specified state. A resistance heater inside the cylinder is turned on, and air is heated for at constant pressure. The entropy change of air during this process is to be determined for the cases of constant and variable specific heats.we will assume that at specified conditions air can be treated as an ideal gas.