A-Level Maths: S1-12 Moments: Lamina Held in Equilibrium at an Angle

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Perhaps one of the hardest topics in the whole of A2 maths and not helped by the fact that the Edexcel blue CGP book barely explains it at all; and then the only question they have has an error in it so its unsolvable. Last topic in the book so I can only assume the writers gave up at that point. Thanks for your help again :)

lukeollerhead
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You are amazing! You make so easy to understand. Thanks.

mamadetaslimtorabally
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are these on edexcel 9MA0 specification, in other word, could these come up on paper 3?

Joe-Fowler
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How come its 1.5 for the sin and not the cos.??? It’s halfway but so is the cos!

adnaaa
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do i have to apply in A? i have try it by using B but it gives me another answer.

siumingsiu
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would the horizontal component 20gsin30 have no turning effect about A as it is horizontal and acts through A ?

susua
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i have no idea why its 20gsin30 surely it would be 20gsin60 because it looks like youve made a right angle in the middle not an angle of 60

takundatsatsa
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why is it 30 degrees how did u work it out?

AlEx-rokd