Homework ??

@Tropical_Willie yes，I can not determine which unit should be used.

“The unit of moment of inertia is a composite unit of measure. In the International System (SI), m is expressed in kilograms and r in metres, with I (moment of inertia) having the dimension kilogram-metre square. In the U.S. customary system, m is in slugs (1 slug = 32.2 pounds) and r in feet, with I expressed in terms of slug-foot square.”
– https://www.britannica.com/science/moment-of-inertia

Also see: https://en.wikipedia.org/wiki/List_of_moments_of_inertia

@Zaku 10^{5 or ×10}5 ？

@tianxiaweigong please refer to this guideline about homework questions.

Homework Questions
Feel free to ask for help on your subject, but simply posting your homework question verbatim and expecting an answer is rude! We’re not here to do your homework for you.

@Mimishu1995
I did not ask anyone do calculation for me.
standard unit！！！
This is beyond the scope of homework. If just for homework, I will pick an arbitrary one.
This is a serious matter.
I think many people do not know it，include many science researchers，so we need a centralized plan.

Didn’t you just say this is homework?

It’s relevant to homework but it’s not homework itself. No reasonable physics assignment is going to be “find out what the standard units for moment of inertia are”. And if it is something like that, then the thing to do is look it up. In the case of Moment of Inertia, it’s not that simple of a question, and it’s not unreasonable to ask for a place to look for good information about it. Especially if you’re not a native English speaker and you’d like to be able to do research from English-language sources. Pointing him to some sources is not doing homework for someone, it seems to me.

@tianxiaweigong You asked ”@Zaku 105 or ×105 ？” but I don’t understand what you’re asking.

The Newton?
One newton is the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in direction of the applied force.

There is no such thing as a “unit of moment”, because “moment” is meaningless without some kind of qualifier. Are you talking about a moment of area? A moment of force? A moment of inertia? A statistical moment? This is a question that no one can begin to answer without more context.

@Zaku I see. In the question they ask “which one is…” and then provide some images, making me think they ask us to choose one of the images and thus asking us to do their homework. Sorry I was a bit too harsh.

@dappled_leaves I’m not an expert of those things, but judging by the OP’s manner I don’t think they are able to convey anything you say clearly, as their English isn’t good enough. The images may give us some clue, but unless someone can read Chinese we won’t know the context.

If what you mean is moment of inertia, the unit is kg – square meters.

@Zaku I am sorry for my poor English，I got it from a science journal. I am continue learning English.