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  1. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    That's what I want. The change in velocity. Why is 17.5 the change in velocity/ why do you add the 9.5 to the 8? Change in speed is easy; 9.5-8=1.5m/s EDIT: I'm an idiot, I get it now. P: The 9.5m/s and 8m/s were in different directions, so it's like 9.5 and -8, it changes by 17.5 :)
  2. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    I have my own questions for once. a) How do you calibrate a CRO? b) How was the change in velocity found in question 2)c)ii) of the attached past papers?
  3. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Left hand rule: So as long as you know two of them, you can find the other. E.g. if you know magnetic field and direction of current, just put your fingers in those directions and however you have to twist your hand to do so will show direction with thumb Right Hand grip Rule: There's two, one...
  4. ThatReallyReallyWeirdDude

    Physics Help PLEASE !

    http://www.passmyexams.co.uk/ Thanks to user Nilmani: http://www.xtremepapers.com/community/members/nilmani.14456/
  5. ThatReallyReallyWeirdDude

    Quick revision notes for Physics and Biology

    Good job ;) Pretty sure a lot of people could use this Though they're all asking in different threads so if you don't mind i'll spread it around
  6. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Yes :)
  7. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    http://www.wisc-online.com/objects/ViewObject.aspx?ID=IAU13208 Very awesome. Try it!
  8. ThatReallyReallyWeirdDude

    I'm good thanks I have my physics tomorrow. I'm ready though so just going around forums helping...

    I'm good thanks I have my physics tomorrow. I'm ready though so just going around forums helping people (because hopefully if i help people with THEIR physics,Allah (s.w.t) will bless MY physics :) It's useful too, they all bring out the hard questions :D
  9. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/motdc.html :)
  10. ThatReallyReallyWeirdDude

    Hello :) How are you?

    Hello :) How are you?
  11. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Because the pivot is not at the center of P, it's on the left corner The distance between W and the center of P is 0.2 - so you have to take away the distance between the center of P and it's corner, which is 0.06/2 = 0.03 On the other hand the distance between the weight and the center of P is...
  12. ThatReallyReallyWeirdDude

    PLEASE HELP PHYSICS PAPER 3

    My exam is tomorrow too :D Hopefully if I help you Allah will bless my own studying and exam. I'm ready anyway, and this is useful :) 9C ON/06 M/J 2007 q2a) The moment caused by the steam is opposite to moment of the weight. When steam pressure is high, it's moment is more than the moment of...
  13. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Depends on grade threshold There have been exams where threshold is less than 45/60 but that's rare, it's usually 47-50/60. Maximum was 54/60 It depends how hard the paper was and how many people score low (that's how they choose grade, by plotting it on curve and stuff). Last year variant 1 A*...
  14. ThatReallyReallyWeirdDude

    Awh thanks I don't think it's that special but people like it it seems ;)!

    Awh thanks I don't think it's that special but people like it it seems ;)!
  15. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Power is given as 2kW = 2000watts Energy = Power x Time Time is 4 minutes (22-18) = 4x60=240 seconds Energy = 2000 (power) x 240 (time) = 480,000J or 480kJ
  16. ThatReallyReallyWeirdDude

    PLEASE HELP PHYSICS PAPER 3

    I can't upload images in inbox conversations for some reason so here's the answer to your question: Reason: The plate to the left is positive and to the right is negative (You don't actually have to put the -tv/+tve signs, thats for your benefit) Electric fields go from positive to negative! ;)
  17. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Yes ;)
  18. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Alright It says that it JUST tips the scale; that means its JUST above equilibrium So we can assume clockwise moments = anticlockwise moments so moment caused by man = moment caused by planks weight so 0.17xW = 0.78x160 W=(0.78x160)/0.17=734N. That's what the mark scheme says ;)
  19. ThatReallyReallyWeirdDude

    PLEASE HELP PHYSICS PAPER 3

    http://www.xtremepapers.com/community/threads/physics-chemistry-and-biology-post-your-doubts-here.11053/page-54 :) I replied to you there.
  20. ThatReallyReallyWeirdDude

    Physics, Chemistry and Biology: Post your doubts here!

    Link to the past paper please. There's three variants so...
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