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This is not exactly a homework question, more like for my own safety

So I have a project going on and I need to use an angle grinder without the safety guard which will be enclosed in a box (made from plastic most probably).

So I decided to check if the plastic box would be able to withstand the impact of the cutting disk (6'') should it break.

I decided to assume a worst case scenario where the whole disk comes off at 12000rpm.

I am assuming it has a mass of about 50g.

After converting this to angular velocity I got 1256 rad/s

I was considering F=ma where a=r⍺

⍺= change in angular velocity/ change in time.

Now this is where I got stuck, should I consider a change of 1256 rad/s in 1s?

thus having an angular acceleration of 1256 rad/s^2?

Also as for the radius, should I consider the distance which the disk will need to travel until it hits the box?

Thanks a lot