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  1. Charlotte20102013

    Mathematics: Post your doubts here!

    HI. Can someone help me with this please? QP: http://onlineexamhelp.com/wp-content/uploads/2013/11/9709_w12_qp_31.pdf 9709/31/ON/12 Q7 (ii). When I equate the denominator to 0, shouldn't I get both x=0 and 3y^3-1=0 ? Why does the mark scheme solve for only 3y^3-1=0? MS...
  2. Charlotte20102013

    Further Mathematics: Post your doubts here!

    Can someone please help me with 9231/01/ON/08 Q7 ? Maybe a step by step solution? I've seen the marking scheme but still can't get the equation given there. Thanks.
  3. Charlotte20102013

    Chemistry: Post your doubts here!

    Can someone help me with this question please Calculate the pH of a mixture of 25cm3 of 0.1M Ca(OH)2 and 20cm3 of 0.1M HCl. I was given the answer 12.82 but I'm not sure if it's the correct one. Thank you!
  4. Charlotte20102013

    Physics: Post your doubts here!

    Thank you so much! (y)
  5. Charlotte20102013

    Physics: Post your doubts here!

    A mass at the end of a helical spring is given a vertical displacement of 3.0cm from its rest position and then released. if the subsequent motion is simple harmonic with a period of 2.0s, find the distance covered by the mass in (i) the first 1.0s (ii) the first 0.75s. [6.0cm; 5.12cm] Thanks...
  6. Charlotte20102013

    Physics: Post your doubts here!

    A particle undergoes SHM on a straight line with amplitude 5.0 cm and frequency 2.0 Hz. At time t = 0, it starts to move to the right from the equilibrium position. Determine the instants when the displacements of the object are 1.0 cm and – 2.0 cm for the first time. I was given the answers...
  7. Charlotte20102013

    Mathematics: Post your doubts here!

    For the topic - Numerical solutions of Equations. Can someone tell me how do I determine the initial value if it is not given in the question? For example: http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s11_qp_32.pdf Q4(ii) Thanks !
  8. Charlotte20102013

    Mathematics: Post your doubts here!

    For the topic - Numerical solutions of Equations. Can someone tell me how do I determine the initial value if it is not given in the question? For example: http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s11_qp_32.pdf Q4(ii) Thanks in...
  9. Charlotte20102013

    Physics: Post your doubts here!

    Another question: An object of mass 0.20 kg tied to a string is made to move in a vertical circle. When the object is at the highest point, the tension in the string is zero. Determine the tension in the string when the object is at the lowest point. [11.8 N] Thanks! :ROFLMAO:
  10. Charlotte20102013

    Physics: Post your doubts here!

    Thank you! And the question was provided by my lecturer and no I do not have any idea where he got it from. ;)
  11. Charlotte20102013

    Physics: Post your doubts here!

    2, member: 114812"]do you have the reference??[/ Reference? As in?
  12. Charlotte20102013

    Physics: Post your doubts here!

    Suppose that a tank contains 680 m3 of neon at an absolute pressure of 1.01x105 Pa. The temperature is changed from 293.2 to 294.3 K. What is the increase in the internal energy of the neon? [3.9x105 J] Need help . Thanks in advance! :p (This is not a past year question)
  13. Charlotte20102013

    Physics: Post your doubts here!

    Right... Silly me.. Hahah! Thanks again!
  14. Charlotte20102013

    Physics: Post your doubts here!

    For Q3 Is the life span of a man really 2x10^9 s??? WHy isn't the answer D?
  15. Charlotte20102013

    Physics: Post your doubts here!

    http://freeexampapers.automaticpapers.com/as-a-level/physics-9702/9702_s14_qp_12.pdf Q27 (Ans: D) Q34 (Ans: D) (How does V1 and V2 vary as light intensity increase/decrease? Do they increase and decrease together?) Urgent help needed. Please and thank you!
  16. Charlotte20102013

    Physics: Post your doubts here!

    The uncertainty in each thermometer reading is 0.5 °C. Question asked for percentage uncertainty in temperature rise. To calculate the temperature rise you take 100-40=60 °C, and that's the differnece between two thermometer readings. When you add or subtract two quantities, their absolute...
  17. Charlotte20102013

    Physics: Post your doubts here!

    Thank you!
  18. Charlotte20102013

    Physics: Post your doubts here!

    Can someone help with these... http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_s13_qp_13.pdf Q3 (Ans: C) (I chose D) Q11 (Ans: A) Q17 (Ans: C) (I chose D cz I thought molecules in solids (ice) are closer together??) Thanks.
  19. Charlotte20102013

    Physics: Post your doubts here!

    Thanks for the explanation. As for your question, Refer to solution 100 at http://physics-ref.blogspot.com/2014/11/physics-9702-doubts-help-page-19.html They are similar. See if it helps. :)
  20. Charlotte20102013

    Physics: Post your doubts here!

    Need help... A ball is falling at terminal speed in still air. The forces acting on the ball are upthrust, viscous drag and weight. What is the order of increasing magnitude of these three forces? A upthrust → viscous drag → weight B viscous drag → upthrust → weight C viscous drag → weight →...
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