I want to ask some questions that is related to cost accounting...
Those questions are given bellow:
1. what is relevant range?
2.state the difference between accounting short-turm and economic short turm.
3.what is operating capacity?
4.define sunk cost and committed cost with an illustration.
5.why zero-defect is essential in JIT?

I have a feeling these are not your questions, but rather homework questions -- just the way a few things are worded. (After all these years, I know the difference between how a book talks and how your average student talks.) If this is homework, then please see our guide for submitting such:

https://www.askmehelpdesk.com/finance-accounting/announcement-font-color-ff0000-u-b-read-first-expectations-homework-help-board-b-u-font.html

Make an attempt to answer them and then someone will be more willing to help.

I'll tell you right now that I personally do not even know all of them because cost is a specialty, and it's not mine. (Especially given this is more advanced cost.) I'd have to research them, meaning you should take the time first yourself to research them.