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  1. Asad Moosvi

    Physics: Post your doubts here!

    Got a quick question. How many significant figures should a percentage uncertainty have? (in paper 3, practical) If I have an absolute uncertainty of 0.1 cm and the reading is 2.5 cm, how many significant figures should the percentage uncertainty have?
  2. Asad Moosvi

    Physics: Post your doubts here!

    Which percentage uncertainty? Sometimes we calculate a percentage uncertainty earlier which isn't even part of the equation.
  3. Asad Moosvi

    Physics: Post your doubts here!

    Hey I need help with a part from the second question. Where you have to show whether or not the relationship is supported by calculating two values of k. I've asked this before, but I'm still confused! Different people are telling me different things, this has just made it worse. You seem like...
  4. Asad Moosvi

    Physics: Post your doubts here!

    How do you choose a sensible scale and draw the line of best fit? This always takes me a while. Also, could you look at my previous post and tell me whether what I've said is correct or not. I'd really appreciate it.
  5. Asad Moosvi

    Physics: Post your doubts here!

    Can I just calculate the percentage difference between the two k's and if it's greater than the percentage uncertainty calculated earlier then it's not supported? And if it's less than or equal to percentage uncertainty calculated earlier, it is supported. Is this essentially the same thing?
  6. Asad Moosvi

    Physics: Post your doubts here!

    Does it matter if k1 is the smaller one or the larger one?
  7. Asad Moosvi

    Physics: Post your doubts here!

    I'm still a little confused. :( The part that I don't get is this: "Now, suppose you got %uncertainty of x as 20%. Then you find k1+ 20% of k1 AND k1-20% of k1 This is the range"
  8. Asad Moosvi

    Physics: Post your doubts here!

    Hey. In physics paper 3 (practical), how do I prove whether a mathematical relationship is supported or not by calculating two values of k? Can anybody help me out here?
  9. Asad Moosvi

    Physics: Post your doubts here!

    Wow, couldn't tell you how much I appreciate this! Number 17, please? :)
  10. Asad Moosvi

    Physics: Post your doubts here!

    I don't get 18
  11. Asad Moosvi

    Physics: Post your doubts here!

    Hey, thanks. How about question 25 from the same paper? I don't get that.
  12. Asad Moosvi

    Physics: Post your doubts here!

    May someone please explain questions 13, 14 and 20? http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s13_qp_12.pdf
  13. Asad Moosvi

    Physics: Post your doubts here!

    Assume the young's modulus is 1 and then arrange the equation so that the extension is on one side and everything else is on the other side. Then just assume values for F, the original length, x, and area, A. Then find the extension. This will be the extension for the crane. Do the same for the...
  14. Asad Moosvi

    Physics: Post your doubts here!

    I understand it now. The mass of the model is 10 times smaller in each direction. So if the mass of the actual crane is 1000 kg, the mass of the model will be 10 kg. The young's modulus is the same in either case. We just have to solve for the extensions and then find the ratio. Simple as pie.
  15. Asad Moosvi

    Physics: Post your doubts here!

    Question 19, anyone??? Please! http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s13_qp_13.pdf
  16. Asad Moosvi

    Physics: Post your doubts here!

    Okay, ignore that question. Can you help me with question 19 though? Same paper.
  17. Asad Moosvi

    AS Physics P1 MCQs Preparation Thread.

    Can someone please help me with question 19? http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s13_qp_13.pdf
  18. Asad Moosvi

    As physics p1 MCQS YEARLY ONLY.

    Can someone please help me with question 19? http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s13_qp_13.pdf
  19. Asad Moosvi

    Physics: Post your doubts here!

    Q 17. Need an explanation. http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s13_qp_13.pdf
  20. Asad Moosvi

    Physics practical tips

    I found a resource that might be helpful for the physics practical. http://www.saburchill.com/physics/practicals/contents.html
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