Need Centre of mass help please :)Watch

#1
Hey people, sorry to be a pain but ive understood centre of mass so far but im unsure how to work out the centre of mass for an arch of a circle. A question from the edexcel m2 book is... "An arc of a circle has radius r cm and the angel at the centre is θ. Find the distance of the centre of mass of the arch from the centre of the circle when: r=4 and θ=pi/2"

Thanks alot for those who help me out, please remember im new at working out this centre of mass for an arch of a circle so could u please be easy on the working out process .
I appreciate the help ALOT, thanks in advance

-Naz
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13 years ago
#2
If I remember correctly you aren't expected to derive the expression for CoM of an arc/ sector for M2... you just read the formula from the formula book and plug in values. The formula should be in the textbook somewhere (I can't remember it off hand).
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#3
Can someone give me a quick guide on how to do this, ive heard its really easy but ive never done it before, thanks.
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