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# Help with centre of mass question please watch

1. hey please can you help me with question 7 about an isosceles triangular plate with a corner folded over

http://www.teachnet-uk.org.uk/2006%2...htm#Questions2

I've worked out the centre of mass for the big triangle minus the small triangle and got 7.5, but i don't know how to incoporate the folded bit, does the thickness get involved?

Please can you explain how to do this or any other method to solve this problem would be appreciated.

Thanks
2. (Original post by coolgal111)
hey please can you help me with question 7 about an isosceles triangular plate with a corner folded over

http://www.teachnet-uk.org.uk/2006%2...htm#Questions2

I've worked out the centre of mass for the big triangle minus the small triangle and got 7.5, but i don't know how to incoporate the folded bit, does the thickness get involved?

Please can you explain how to do this or any other method to solve this problem would be appreciated.

Thanks
you can simply consider it another triangle, find the center of mass of the other triangle

then with 2 centers of mass, you can figure out the relative mass using half base times height, then take moments

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