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  1. PANDA-

    Mathematics: Post your doubts here!

    Alternative method... similar but I think it's easier F2=3F1 P2=5P1 F2V2=5F1V1 Substitute F2=3F1 and V1=6 3F1V2=5F1(6) 3F1V2=30F1 F1V2=10F1 Cancel out F1 V2=10 I think you already got the height which is 50, using trigonometry, we'll use that to get P.E. Work done by driving force <What...
  2. PANDA-

    A level Biology: Post your doubts here!

    Tissue fluid? He did say translocation=plants...
  3. PANDA-

    Mathematics: Post your doubts here!

    I second this as well.
  4. PANDA-

    Some good P1 notes?

    Mathematics 9709...
  5. PANDA-

    Mathematics: Post your doubts here!

    Yup, got it, thanks a lot.
  6. PANDA-

    Some good P1 notes?

    Anyone? (n)
  7. PANDA-

    Mathematics: Post your doubts here!

    No I meant how did you get a+4d/a=a+14d/a+4d
  8. PANDA-

    Mathematics: Post your doubts here!

    But wait.. how do you equate the two... I mean a+4d/a=a+14d/a+4d.. Just that part.
  9. PANDA-

    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20%289709%29/9709_w07_qp_1.pdf q4 ii and iii
  10. PANDA-

    Some good P1 notes?

    Does anyone have some good P1 revision notes, something that I can review a few days before the exam...
  11. PANDA-

    Chemistry: Post your doubts here!

    Oh yes, sorry mixed that up, but the primary will not give aldehyde, because the oxidation will take place directly to Carboxylic acid, because it's acidified K2Cr2O7 under reflux, i.e. strong oxidation. But for secondary, there is no further oxidation after ketones.
  12. PANDA-

    Chemistry: Post your doubts here!

    They said before when X is heated with Na2CO3 it gives an effervesence, and what gives effervesence with CO3? Acids. So now we know it's a -COOH... and it has 3 carbons, so it technically could be propanoic acid, but they said it reacts with K2Cr2O7, which means it has to have an -OH group as...
  13. PANDA-

    A level Biology: Post your doubts here!

    For this first question... The answer is pretty clear in the MS. When the malarial parasite invades an RBC, it makes it more rigid, making it harder for the RBC to move through blood vessels, so eventually it will rupture, this causes the number of RBC's to reduce, and therefore the number of...
  14. PANDA-

    Chemistry: Post your doubts here!

    Well, you can't really memorize every single reaction... That except the organic reactions, which you must memorize, and are laid out very nicely here.. https://www.xtremepapers.com/community/threads/easy-organic-synthesis.24625/ If it's not clear, scroll further.
  15. PANDA-

    Chemistry: Post your doubts here!

    OR... MS Word + Screenshot + Ctrlv.in
  16. PANDA-

    A level Biology: Post your doubts here!

    Did you mean the question that says... "Outline the likely effects..."? Please state the question number, makes everything easier.
  17. PANDA-

    Mathematics: Post your doubts here!

    I second this if someone could reply to this would be great.
  18. PANDA-

    A level Biology: Post your doubts here!

    Not sure about this, but I'll try... Base pairing helps to keep the DNA molecule stable, as if the bases were exposed, and not paired inwards in the way they are, they would react with cellular fluids, which would cause the loss of the DNA information. Also, base pairing occurs with hydrogen...
  19. PANDA-

    Mathematics: Post your doubts here!

    Okay, but that can't be the only to do it right?
  20. PANDA-

    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20%289709%29/9709_s05_qp_1.pdf Question 7, part (iii)
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