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# M2 OCR centre of mass watch

1. Hi, I was wondering how to find the centre of mass of a few things. I know what to do with a triangle, but what do you do with things like a semi-circle, a cone and a hemi-sphere?

Attached below are some questions in this context:
Attached Images

2. Would look nicer if you saved it as a gif
3. Cheers for that, I'll keep that in mind.
Seriously though;
any help with the question?
Attached Images

4. it's really same as triangle but taking different position

Triangular Lamina: 2/3 along the median from vertex
Solid hemishpere, radius r : (3/8)r from centre
Hemisphere shell, radius r : (1/2)r from centre

I think these are included in the Formula Sheets
5. (Original post by sena168)
I think these are included in the Formula Sheets
Yeah your right, I checked out the OCR specification.
Look at the attatchment (in GIF format!) to see what you get. Looks like everyting!
Cheers
Attached Images

6. has anyone got answers for GIF VERSION of semi-circle (much prettier).gif question?

I got 11.6 for the distance from B, but im not sure if its correct

a night before the exam and still learning!
7. (Original post by u2o_uk)
has anyone got answers for GIF VERSION of semi-circle (much prettier).gif question?

I got 11.6 for the distance from B, but im not sure if its correct

a night before the exam and still learning!
Yeah, I got 11.6 too, should be right.
8. yep, night before - becoming too common for my liking, i really must revise earlier.

this revision (i started at 11pm) is the only revision i will get for M2! i was so bad for phyiscs and business studies exams i had a last minute panic and stayed up all night.

oops

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