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  1. B

    Physics: Post your doubts here!

    E = Pt = V^2t/R, since V and t are constant we can write this equation as: E = k/R So, E is directly proportional to 1/R So, can can conclude: E1/E2 = R2/R1
  2. B

    Chemistry: Post your doubts here!

    The ions present in a solution of ethanol and H2SO4 are: 2H+ OH- HSO4- and the intermediate: CH3CH2O+ First: 2AL + 3/2O2 --> AL2O3 Mole ratio is 2:1 so 0.02 mol of Al will give 0.01 mole of AL2O3. Then: Al2O3 + 6HCl --> 2AlCl3 + 3H2O Mole ratio is 1:6 so 0.01 mol of Al2O3 will react with 0.06...
  3. B

    Physics: Post your doubts here!

    E = Pt = V^2t/R Where V (pd) and (t) are constant in both the cases therefore: E1/E2 = R2/R1 E1 = 1.1 * 10^5 R1 = 45 R2 = 15 Substitute the values into the equation. Answer is 3.67 * 10^4
  4. B

    Physics: Post your doubts here!

    Change in PE = GMm [1/(R+h1) - 1/(R+h2)] Change in KE = 1/2m (v1^2 - v2^2) Equate equations. m cancels. Substitute values of G, (R+h1), (R+h2), v1 and v2 and you'll get the correct answer.
  5. B

    Physics: Post your doubts here!

    The question says that the volume is increased from 1.8 to 2.1. This is done by moving the piston and not by heating the cylinder because the question mentioned 'insulated' cylinder. Therefore, it doesn't make sense for the temperature to RISE (as it seems to do when using pV = nRT or v1/t1...
  6. B

    Chemistry: Post your doubts here!

    Please check if you have the right options for this question because the product is supposed to be an alkane or a bromoalkane and none of the options given have the proper number of carbon and hydrogen atoms for it to be an alkane. 1 equilibrium mixture N2F4 <=>2NF2 Enthalpy change is positive...
  7. B

    ~~jokes?? in here?? really??

  8. B

    Mathematics: Post your doubts here!

    The text book is right and my method is right as well. Your implementation was correct till finding the arc lengths but you calculated the perimeter wrongly. The actual perimeter of the shape means the outer arcs of both the circles combined. The outer arc is calculated as follows: Circumference...
  9. B

    Math, Physics and Chem.

    Math, Physics and Chem.
  10. B

    Best Life Guide...Mind or heart?? :p

    Watching too many movies nowadays, huh? :P
  11. B

    Best Life Guide...Mind or heart?? :p

    Both are important but the question was 'best' life guide, which would be mind in my opinion :P
  12. B

    SAT 2

    SAT 2
  13. B

    A level and SAT preparation

    A level and SAT preparation
  14. B

    Physics: Post your doubts here!

    dU = q + w dU = mc(dT) + pV Volume can also be used instead of mass but 'c' is still not given.
  15. B

    Islam and Christmas

    Hmm. Well it's sad to hear that i'm unable to change your mind about birthdays. I'd still request you to watch a video of Zakir Naik related to the issue of birthdays. I don't think a debate will be required after that. Well, that's the way debate works. I would like to apologize as well. :)...
  16. B

    Thanks. Studies, mostly.

    Thanks. Studies, mostly.
  17. B

    Best Life Guide...Mind or heart?? :p

    The MCQ done with instinct may or may not be right. The one solved with logic will always be right.
  18. B

    Mathematics: Post your doubts here!

    You can also draw the same shape as shown in the image attached. Then use cosine rule and sine rule to find the angles x and y. Use 2x and 2y to calculate arc lengths and accordingly the perimeter. 8C4 * 8C4 = 4900 (I think. Permutations and combination questions are really confusing.) dx/dt...
  19. B

    Islam and Christmas

    Oh, but there are scholars who have given a fatwa against it. In fact, my mother read 3 of them to me 2 days ago from a book approved by Da'arrussalam and all 3 of them stated that celebrating birthdays is 'najaiz', if not gunnah. Celebrating Milad however, is in a sense forbidden considering...
  20. B

    Chemistry: Post your doubts here!

    I think this is O level.
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