M2 centre of mass question Watch

wamble
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Hi, I've been working on this question from an M2 paper (June 2013), and I couldn't work out how to find the moment of the weight about the point A. Looking at the answers, it seems like they've used two components - parallel & perpendicular to the surface to work out the overall moment but I don't really understand how. Could anyone explain?

Thanks!
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tiny hobbit
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(Original post by wamble)
Hi, I've been working on this question from an M2 paper (June 2013), and I couldn't work out how to find the moment of the weight about the point A. Looking at the answers, it seems like they've used two components - parallel & perpendicular to the surface to work out the overall moment but I don't really understand how. Could anyone explain?

Thanks!
Draw vertical lines through A and through the midpoint of AD.

Using the 0.3 m takes you to the line through the midpoint of AD so you have to subtract the distance in the little triangle to the left of A.

You'll need to work out where the 40 degrees goes in the relevant triangles.
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wamble
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(Original post by tiny hobbit)
Draw vertical lines through A and through the midpoint of AD.

Using the 0.3 m takes you to the line through the midpoint of AD so you have to subtract the distance in the little triangle to the left of A.

You'll need to work out where the 40 degrees goes in the relevant triangles.
Ohh that makes sense, thanks for the help! <3
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