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Recent content by mahad

  1. M

    CHEMISTRY P12: INCREDIBLE!!!

    people increase in temperature ALWAYS speeds up rate of reaction and that should be pretty clear whether it is forward or backward. It is just that in case of ammonia the rate of backward reaction increases more because the enthalpy change is endothermic in the backward reaction. REMEMBER...
  2. M

    ANY1 with a heart out there help this poor soul!!!!

    here's the answer to your second question http://xtremepapers.net/forums/viewtopi ... =26&t=1382
  3. M

    PURE MATHS 3 URGENT !!!!!!

    well this simply means that the general point of the plane is actually 3i less than the calculated value of X for example if x comes out to be 5 then the actual general point is 2. i hope you got this.
  4. M

    How to convert analogue to digital in Phy p4

    I got it buffer solution thanks. princesszahra how can i use my calculator for the same? i didn't get this
  5. M

    How to convert analogue to digital in Phy p4

    I don't get this. how do we divide and how do we proceed. say 4V. If i divide it by 2 I get 0 as the remainder and 2 as the quotient and i don't know how to proceed. help!
  6. M

    Chemistry P33 Anions/Cations

    WELL people the reason why you should have added the barium salt first and then the acid was that if the ppt were soluble then it was a sulphite which OBVIOUSLY isn't a sulphate and for that we had to write that sulphate was absent. So if you didn't add the acid later you would have seen a white...
  7. M

    Physics P33 - Viscosity and diode

    valuable information mate. Usually they don't ask for the sources of error and improvements in the first question but if this happens to be the second question then well yes everybody should take a look.
  8. M

    Physics P33 - Viscosity and diode

    People I have been hearing a lot about this viscosity and diode. Could somebody cast bright good light on both the questions. I'd inshAllah be updating this post so that the members can know what really we have discussed up till so far. For Question 1 - the viscosity question - I've heard that...
  9. M

    Estimates in physics

    people somebody please post the estimates of the diameter of nucleus, separation of nucleus and other such estimates. thanks.
  10. M

    Physics Paper1 M/J 2006 and O/N 2006

    I'm a bit confused about 27. did 31 first. well the direction is obvious it is from y to x because how the battery is connected. now find out time. q = I x t. q = 1.6 x 10-19 and I = 4.8A. T comes out to be 3.33 x 10-20. as it demands tha rate of flow which is 1/T. so inverse this to get...
  11. M

    Physics Paper1 M/J 2006 and O/N 2006

    ok coming to may/june 06 q12 => mass of first truck is m and its velocity is 2v. it's momentum becomes 2mv. mass of second truck is 3m and its velocity is -v because it is coming in the opposite direction. after collision mass becomes 4m as both stick together and there speed let be V. as there...
  12. M

    Physics Paper1 M/J 2006 and O/N 2006

    q27 => well they told you that slit separation is 500 times more than the line spacing of the grating. suppose the grating separation is T. so apply the formula used in diffraction grating to get lambda in terms of a. => dsintheta = nlambda. (d = T, theta = 30degrees, n = 1). so lambda = T/2...
  13. M

    Physics Paper1 M/J 2006 and O/N 2006

    ok starting from nov/oct 06 q17 => efficiency = required output / input x 100. here the output is light. input total is 93 + 7 Joules. 7/100 x 100. gives you 7%. q18 => efficiency of the locomotive is 80%. find out the voltage supplied. which is 80% of 25000V. now. for this voltage calculate the...
  14. M

    URGENT: Permutations and Combinations, Mathematics P6!

    mate this is one topic with the easiest of concepts to get and one of the most difficult of questions to solve. you can ask anybody the difference between the two and the main gist of both the definitions would be that in permutations order is important and in combination order is immaterial...
  15. M

    physics help

    ok i came across a few more problems. this is paper 4 physics may/june 09 question no. 3 part ii... why do we subtract the masses and the powers...i just couldn't figure this out. same paper question 6 part c..a full explanation required of this one..actually my concept of this root mean square...
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