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  1. K

    October/November 2012 CIE |Question Papers ||Marking Schemes||Grade Thresholds| |Examiner Reports|

    Thank you!
  2. K

    CIE PASSWORD HELP PLEASE.....

    Hi guys I became interested.. Is it really possible to get the results online if: -a private candidate AND -no login/password were given. If a person has login and password, he/she can only see own results or anyone's?
  3. K

    help needed

    Hey guys, Does anyone know when the Oct/Nov papers(a-level) will be released? Should they be released earlier than results? Thanks)
  4. K

    Mathematics: Post your doubts here!

    so your integral is given by I = integral(-0.5 ; 0) of e^(-x) * (1+2x) dx u = 2x+1, dv = e^(-x) dx. hence du = 2dx and v = -e^(-x) I = (2x+1)*(-e^(-x)) +2 integral (e^(-x) dx) I = -e^(-x) * (2x+1+2) = -e^(-x)*(2x+3) inserting limits, obtain: I = -3 + e^(0.5)*2; hence the volume is pi*(2...
  5. K

    Physics: Post your doubts here!

    The force acting on the metal X is the same as the force acting on the metal Y(denote it as F) and according to Hooke's law: lambda(modulus of elasticity)/natural length = F/x. for metal X: lambda = 3*F/x = 3 m*F/1.5 mm= 2000F for metal Y: lambda = 1*F/x = 1m* F/1.0 mm= 1000F hence the...
  6. K

    Mathematics: Post your doubts here!

    why not. take exponent as dv and the polynomial as u: integral u dv = uv - integral v du
  7. K

    Mathematics: Post your doubts here!

    (-1/2;0) is the point of intersection of the graph with x-axis hence the lower limit is -1/2 it's given by: pi* integral from -1/2 to 0 of y^2
  8. K

    Physics: Post your doubts here!

    The train decelerates uniformly between the yellow and reg lights. Hence, we can apply the equations of motion with uniform acceleration, especially this one: 2*a*x = v^2 - u^2. the final velocity of the train v = 0. the initial is u. the acceleration is negative, hence we can rewrite it as...
  9. K

    Mathematics: Post your doubts here!

    Should use the identity (dy/dx) * (dx/dy) = 1. In this case x = tan y. then dx/dy = sec^2 y hence dy/dx = cos^2 y now substitute y = tan^(-1) x: dy/dx = cos^2( tan^(-1) x). denote the angle tan^(-1) x as B and find cos^2 B if tan B = x; using identity sec^2(B) = 1 + tan^2 B, obtain dy/dx =...
  10. K

    Physics 43!! How was it?? Expected GT anyone?

    I messed up there. it's correct, if you use rms
  11. K

    Physics 43!! How was it?? Expected GT anyone?

    The mass-energy is conserved. I don't say anything about neutrons. All the lost mass is the energy released.
  12. K

    Physics 43!! How was it?? Expected GT anyone?

    I don't know how to explain it to you. We had mass-energy before the reaction and after. All the lost mass is the energy released.
  13. K

    Physics 43!! How was it?? Expected GT anyone?

    I am trying to say that the masses were given for all the nuclei and particles. don't you remember the voltage in de Broglie problem?
  14. K

    Physics 43!! How was it?? Expected GT anyone?

    I don't remember my wavelength, but the others are the same
  15. K

    Physics 43!! How was it?? Expected GT anyone?

    No. I didn't round it up to 200. I got something like 199.89 etc. It is because the neutrons were also the products of the reaction.
  16. K

    Physics 43!! How was it?? Expected GT anyone?

    Anyway, recall the first task, where you should find the binding energy of uranium. how would you solve that without knowing masses of proton and neutron (which were given). The table contained the 3 headings: particle/ mass and binding energy per nucleon. Data for every particle and nuclei was...
  17. K

    Physics 43!! How was it?? Expected GT anyone?

    they gave everything, including exact masses, maybe you didn't pay much attention.
  18. K

    Physics 43!! How was it?? Expected GT anyone?

    http://www.thebigger.com/chemistry/nuclear-and-radiation-chemistry/calculate-the-energy-released-nuclear-reaction/ take a look please. the masses were given not for nothing, i think
  19. K

    Physics 43!! How was it?? Expected GT anyone?

    Yes
  20. K

    Physics 43!! How was it?? Expected GT anyone?

    I don't know really. Maybe someone else will tell how to solve =)
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