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# Official M5 Edexcel Thread June 2016 watch

1. (Original post by Ewanclementson)
Having checked the answer you agreed with for Q5, I do disagree. The centre of mass was a distance of root(10)/2 from the pivot.
m(2a)+m(a)=2mx leads to x=1.5a then the centre of mass was 1.5a below L and by symmetry, 0.5a from l which gives root(10)/2.
what do you mean? this was random's answer and that was what I put.
2. I was saying that I think random's answer which had a root2 in was incorrect (and you said you put what he did). I believe 8752 is correct
3. (Original post by Ewanclementson)
I was saying that I think random's answer which had a root2 in was incorrect (and you said you put what he did). I believe 8752 is correct
4. (Original post by 8752)
Yes you're right it does lie on the line joining the two masses. The distance should be root10/2 a however. Im curious as to how people got root 2 tho?
Incorrect use of the cosine rule: if you do it with the measurements on my diagram you would get csquared as
5/2, rooting that gives root10/2, but for some reason instead of taking moments I used cos rule just a tiny bit wrong like this
by a factor of 2 in the term with cos145 gcse tier error tbh
5. Just got hold of the paper and had a go myself.
Question 4 is ambiguous in that it's open to interpretation (with or without caps?). I've included both possibilities.
Attached Images
6. 6681_01_que_20160621.pdf (289.0 KB, 81 views)
7. M5 2016.pdf (136.3 KB, 106 views)
8. (Original post by kloitrell)
Just got hold of the paper and had a go myself.
Question 4 is ambiguous in that it's open to interpretation (with or without caps?). I've included both possibilities.
If you look in the formula book that Edexcel give you, the M of I of a cylindrical shell is given as being the same as for a hoop. That tells you that the shell does not have caps.
9. (Original post by tiny hobbit)
If you look in the formula book that Edexcel give you, the M of I of a cylindrical shell is given as being the same as for a hoop. That tells you that the shell does not have caps.
I think it should always be stated though. I did both ways aswell but it really should be stated.

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