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  1. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Barium Sulphate (BaSO4 is not soluble). We learned this in the solubility table, didn't we? So how can it be used to make aqueous solution?
  2. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    They're correct. We've been dumbfounded by the basics. :cry: Kill me now. Barium sulphate is not even soluble! How could it be in (aq.) form after reacting. :(
  3. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Yeah, barium comes after potassium and sodium.
  4. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Which paper?
  5. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    lg x = 4, therefore, x = 10^4 x = 10000
  6. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    B should be the answer.
  7. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    We proved in first part that ABP is congruent to BCQ. Therefore, ABP = BCQ, AD is parallel to BC, APB = CBM (alt. angles) AB = BC, Therefore, triangle ABP is congruent to CBM (AAS). Hence, BMC = BAP = 90 deg.
  8. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Construction and mining (exposing radioactive sources underground). Nuclear waste and Nuclear power plants give off background radiation. Global warming causes destruction of ozone which leads to more cosmic radioactive rays from the sun.
  9. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    A cathode ray oscilloscope consists of a cathode, a grid (optional), an anode, y-plates, x-plates and a florescent screen. The cathode is heated (like a filament) and it emits electrons (thermionic emission). The anode is connected to a large positive potential (hence it is positively charged)...
  10. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    (b) (i) Trapezium is the answer, reason: BE = kq, this means that it will be a horizontal line similar to AC of longer/shorter length. If you draw it, you'll see that it's a trapezium. (ii) AE = AB + BE = p + kq (triangle law) (iii) DA = 3p + q D, A and E are collinear, Therefore, AE = x DA (x...
  11. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    For $25, the value after 8 years is $62. $500 investment is 20 times that of $25. Therefore, Value of $500 after 8 years = 62 * 20 = $1240.
  12. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Which marking scheme? :eek: The marking scheme says "decrease to 5 m/s at 25 s".
  13. Saad Mughal

    The picture. Lol. :D

    The picture. Lol. :D
  14. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    Yeah, it should be x^2 + x - 2.
  15. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    1 seems wrong, the value of x = 1.2 if proportionality is to be applied.
  16. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    For first, B is the answer. For second, A is the answer.
  17. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    Don't know about 1, but 2 is C.
  18. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    A is the answer.
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