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  1. i_try9621

    Physics: Post your doubts here!

    We use A= -λN because we have Activity, Decay constant and N( the no of particles that are present). Using that formula we get N= 9.52 x 10^7 of Radon-222 atoms So the ratio will be (2.52 ×10^25)/(9.52 x 10^7) giving 2.6 x 10^17. I believe this is the correct answer.
  2. i_try9621

    french speaking exam 2017 help?

    what books do you use to learn french? Or any resources that you use ?
  3. i_try9621

    Mathematics: Post your doubts here!

    First one says sinx = cosx which happens when x = 45( from the graph) In b), at about 66 degrees you see the difference b/w sinx and cosx is 0.5
  4. i_try9621

    Physics: Post your doubts here!

    For this if you look at the samples taken you see that some peaks get lost (between 0.25ms and 0.50ms & between 1.00ms and 1.25ms) which we don't want. So there is a significant change in voltage measured and the sampling frequency(or sampling rate) is too low.
  5. i_try9621

    Physics: Post your doubts here!

    Q5 b) ii) from 41/O/N/15
  6. i_try9621

    Physics: Post your doubts here!

    Do a lot of past papers. That's how I revise usually and definitely read the notes.
  7. i_try9621

    Mathematics: Post your doubts here!

    Square both sides Last step will be 8a^2 > 4ax Final answer is x < 2a
  8. i_try9621

    Mathematics: Post your doubts here!

    yup it's wrong, thanks for the help
  9. i_try9621

    Mathematics: Post your doubts here!

    In 2. How is it that the line l is on the plane? Also the answer on the markscheme says it's 7x + 8y - 11z = -38
  10. i_try9621

    Mathematics: Post your doubts here!

    Need help with Q29) part 3
  11. i_try9621

    Mathematics: Post your doubts here!

    And thanks for helping me out :)
  12. i_try9621

    Mathematics: Post your doubts here!

    jhz why did you consider a to be (1,2,-1) because this is a direction vector, isn't it? I have tried this sum and my ans was 7x + y - 5z = 17 and I took a to be (1,0,-2) from the line l.
  13. i_try9621

    Mathematics: Post your doubts here!

    Need help with Q24 part 2
  14. i_try9621

    Mathematics: Post your doubts here!

    It's definitely not hard to get an A in AS Math although I believe M1 can be a bit tricky and P1 is really easy if you have done Add Maths in O-levels
  15. i_try9621

    Mathematics: Post your doubts here!

    In i, Why do we need two points that are on both planes? Also couldn't it be that the planes were skewed?
  16. i_try9621

    Mathematics: Post your doubts here!

    Need help with Q19
  17. i_try9621

    Suggestion for 9709 mechanics p4&5

    how hard do you find P5 to be than P4 from your experience or from what you have heard about it ?
  18. i_try9621

    Physics: Post your doubts here!

    I now finally understand. You sir, are a genius. Thank you!
  19. i_try9621

    Physics: Post your doubts here!

    Okay, I now did understand the significance of including the weight but the equation that you have given here F_c = F + F_g and the equation you used in the first reply where the tension is 18N, and is equal to the sum of the stone's gravity and the centripetal force. My confusion is that are...
  20. i_try9621

    Physics: Post your doubts here!

    As you mentioned above in the first reply, that the gravity of the stone is exerted on the glue. Could that be the reason why the weight should be included here ? Or am I looking at it the wrong way?
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