Question: A 200 kg cast iron machine part at 500oC is left
A 200-kg cast iron machine part at 500oC is left to cool at room temperature. Assume the machine part is a cube and has an emissivity of 0.780. At what rate is the machine part initially losing heat due to radiation?
Answer to relevant QuestionsA 5.00-g pellet of aluminum reaches a final temperature of 63 oC when gaining 200 J of heat. What is its initial temperature? A student challenges the second law of thermodynamics by saying that entropy does not have to increase in all situations, such as when water freezes to ice. Is this challenge valid? Why or why not? In an isobaric process, an ideal gas sample can do work on the environment but its temperature also increases. How can this be? An ideal gas sample expands isothermally by tripling its volume and doing 5.0 x 104J of work at 40 oC. (a) How many moles of gas are there in the sample? (b) Was heat added to or removed from the sample, and how much? In an isothermal expansion at 27 oC, an ideal gas does 60 J of work. What is the change in entropy of the gas?
Post your question