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# Edexcel AS/A2 Mathematics M1 - 8th June 2016 - Official Thread watch

1. (Original post by sss786)
-i+j=0 ??
then can you rearrange to get j=i

thanks
Well the i and j components have equal magnitude but opposite direction (assuming you are taking east and north as the positive directions in usual fashion)
2. [QUOTE=13 1 20 8 42;65547879]Well the i and j components have equal magnitude but opposite direction (assuming you are taking east and north as the positive directions in usual fashion)[/QUOTE

Thank you,
What other scenarios can they give other than north west?

Thanks
3. Hey, how much does it matter that I used a method that the mark scheme doesn't mention? I get the correct answer but I have used a different SUVAT equation than specified in the mark scheme.

Since the exam is in 9 hours can you please answer this quickly?
4. North-West = positive j and negative i
5. Nortwest= positive i negative j
6. Otherway round mate

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7. do we need to know sine and cosine rules??
8. do we need to know sine and cosine rules
9. Hey, quick question - how many significant figures do we leave are answers to

AND, do we leave it as a fraction if we can
10. (Original post by dripper)
Hey, quick question - how many significant figures do we leave are answers to

AND, do we leave it as a fraction if we can
3 sf or 2 dp
11. (Original post by dripper)
Hey, quick question - how many significant figures do we leave are answers to

AND, do we leave it as a fraction if we can

3 sf or 2 dp
12. Never fractions, right? I.e. if the answers 5/7 I'd like it as 0.714?
13. (Original post by dripper)
Never fractions, right? I.e. if the answers 5/7 I'd like it as 0.714?
Well i dont think it really matters, as in the mark scheme it allows both
14. (Original post by dripper)
Never fractions, right? I.e. if the answers 5/7 I'd like it as 0.714?
Whenever a numerical value of g is required, take g = 9.8 ms^-2 and give your answer to either two or three S.F.
So if you are not using g it is fine to leave the answer as a fraction.
15. (Original post by TercioOfParma)
Hey, how much does it matter that I used a method that the mark scheme doesn't mention? I get the correct answer but I have used a different SUVAT equation than specified in the mark scheme.

Since the exam is in 9 hours can you please answer this quickly?
As long as you use a suvat equation with the correct signs (+ or -) and get the right answer then it will be fine. Doesn't have to be the one stated in the mark scheme and obviously examiners get a much more detailed MS.
16. (Original post by student bang)
do we need to know sine and cosine rules
yh you might need to apply them especially when working with vector triangles.
17. (Original post by student bang)
do we need to know sine and cosine rules
Its helpful for say a triangle of forces question makes it easy to solve. Just go over it shouldnt take long, its basic C2 stuff (cosine/ sine rule)
18. what is vector triangles
19. (Original post by student bang)
Nortwest= positive i negative j
Postive i negative J is south east
20. (Original post by Unknow_n123)
As long as you use a suvat equation with the correct signs (+ or -) and get the right answer then it will be fine. Doesn't have to be the one stated in the mark scheme and obviously examiners get a much more detailed MS.
What about if, with the questions with like tan(theta) = 3/4, i just put in cos(arctan(3/4) instead of the value of theta or precalculating it??

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