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Recent content by Charlotte20102013

  1. Charlotte20102013

    Physics: Post your doubts here!

    Hi can someone help me with this please: An iron block of 30 kg mass and 90°C temperature is dropped into an insulated tank that contains 50 kg of water at an unknown temperature. At the same time a paddle wheel is driven by a 400 W motor is activated to stir the water. It is observed that...
  2. Charlotte20102013

    Further Mathematics: Post your doubts here!

    Gotta thank you both for helping me out the past two weeks! :LOL::X3:
  3. Charlotte20102013

    Further Mathematics: Post your doubts here!

    For questions like 9231/21/MJ/14, Q5, when do we take the total mass to act at mid-point of AC? So far the questions I've done doesn't. It adds up all mass from different distances from the axis of rotation, but for this question it takes total mass to act at mid point.. When do we do this?
  4. Charlotte20102013

    Further Mathematics: Post your doubts here!

    Ahh okay.. Get it now.. Thanks! :D
  5. Charlotte20102013

    Further Mathematics: Post your doubts here!

    Did you put the negative sign for the force towards A only because it acts towards LHS and you take LHS direction as negative? Or is the negative sign of another reason? Can I put it for the force towards B instead? :unsure:
  6. Charlotte20102013

    Further Mathematics: Post your doubts here!

    Could you also show me steps and explanation for Q4? For the same paper.. Appreciated :)
  7. Charlotte20102013

    Further Mathematics: Post your doubts here!

    9231/23/MJ/13 Q9 (Last part) Why only the y-int is affected (divided by k)? What's the concept behind this? When and what values will be affected when divided/multiplied/added/subtracted?? Q10 (iii)&(iv) Don't understand the mark scheme, how do you get and AP and how to continue from there...
  8. Charlotte20102013

    Further Mathematics: Post your doubts here!

    Can I ask you some questions ?
  9. Charlotte20102013

    Further Mathematics: Post your doubts here!

    Anyone here doing Paper 2 ?
  10. Charlotte20102013

    Further Mathematics: Post your doubts here!

    I thought it was quite difficult compared to past papers... I did paper 13... :cry:
  11. Charlotte20102013

    Further Mathematics: Post your doubts here!

    Another question. How do we tell the axis of symmetry of a polar graph? Like I've learnt that if it's a function of cos only then it will be symmetrical about theta=o . And if sin only, it will be about theta=pi/2. Is this correct? Besides that, I've seen a past year question. cos(2theta-3pi/4)...
  12. Charlotte20102013

    Further Mathematics: Post your doubts here!

    Oh I get it now! Wasn't that complicated after all. :LOL: If you're free could you please help with more? 9231/11/ON/13 Q3. Express Ur in terms of r. I know how to express it but I don't know how to show it step by step or how to explain what I did to arrive at that answer. And how to justify...
  13. Charlotte20102013

    Further Mathematics: Post your doubts here!

    Are you talking about the part to deduce the roots of equation are.... ? I know how to solve the last part 'Hence show that...' But not the 'deduce...' I'm sorry I still don't get it. Could you explain further?
  14. Charlotte20102013

    Further Mathematics: Post your doubts here!

    Need help with 9231/11/MJ/14 Q7 second part "Deduce...". THANKSS.
  15. Charlotte20102013

    Further Mathematics: Post your doubts here!

    It's ok. I got it already. ;) I do need help with 2012 N P13 tho. Q12 OR, I'm not sure how to show the last part. :(
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