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Recent content by Mathemagical

  1. Mathemagical

    Physics: Post your doubts here!

    No problem! :)
  2. Mathemagical

    Physics: Post your doubts here!

    Resistance is proportional to length, and inversely proportional to diameter/radius squared. Let the resistance of the first wire be R. Resistance of second wire = 2*(1/4) R = 0.5R Current = 2V/0.5R = 4I
  3. Mathemagical

    Physics: Post your doubts here!

    3: a) Binding energy is the energy required to separate the nucleons in a nucleus to infinity. OR Binding energy is the energy required to bring together nucleons in a nucleus from infinity. (first definition preferred) b) ii) Mass defect, ∆m = 211.70394 – 209.93722 = 1.76672u binding...
  4. Mathemagical

    Chemistry: Post your doubts here!

    Entropy is a measure of disorder. For I, 1 mole of the complex is formed from 5 moles of solute. Hence, there is a decrease in entropy. For II, 1 mole of the complex is formed from 3 moles of solute. This means there is an increase in entropy (disorder), because fewer moles of solute forms the...
  5. Mathemagical

    Student with 4 A*s in his A Levels, currently taking a gap year before studying in the UK. Don't...

    Student with 4 A*s in his A Levels, currently taking a gap year before studying in the UK. Don't hesitate to contact me if you need help!
  6. Mathemagical

    Physics: Post your doubts here!

    2: There are 3 parts of the current-time graph. i) steadily increasing current until near t1, meaning that emf is constant (as emf is gradient of the graph, and the gradient is constant). ii) sharp decline in current around t1. The emf for this region is much larger than in the first part as...
  7. Mathemagical

    Physics: Post your doubts here!

    1: a constant non-zero value of E from 0 to 3 cm a different constant non-zero value of E from 3 to 6 cm E from 3–6 cm has the opposite sign to and larger value than E from 0–3 cm Notes: Emf is the rate of change of magnetic flux, which means it's essentially the gradient of the magnetic flux...
  8. Mathemagical

    Chemistry: Post your doubts here!

    Gibbs free energy = H - TS S = (H-G)/T *1000 You multiply by 1000 because the unit for S is J/Kmol, while the units for H and G are kJ. Hence, the answer is 14.1.
  9. Mathemagical

    Further Maths Topical Papers

    UPDATED: Pure Topical Papers
  10. Mathemagical

    Further Maths Topical Papers

    Hey everyone, here are some topical further maths mechanics papers. Stay tuned as I will be uploading more for stats and pure! P.S. These are for 2002-2011 only.
  11. Mathemagical

    Chemistry: Post your doubts here!

    1. It has to be a tertiary alcohol, as it cannot be oxidised. 2. It is chiral, so it has 4 different groups attached to the main C atom.
  12. Mathemagical

    Chemistry: Post your doubts here!

    That is free radical substitution.
  13. Mathemagical

    Chemistry: Post your doubts here!

    NH3 is the nucleophile because it has a lone pair which "attacks" the electron deficient centre.
  14. Mathemagical

    Chemistry: Post your doubts here!

    Chlorine will react with cold NaOH to form hydrogen and sodium chlorate (I).
  15. Mathemagical

    Physics: Post your doubts here!

    Gain in Potential Energy = mgh = mgs (sin α) Work done by engine = Fs Efficiency = mgs (sin α)/Fs = mg (sin α)/F
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