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Recent content by usmiunique

  1. usmiunique

    A2 Physics | Post your doubts here

    The worst line can EITHER be the steepest possible line OR the shallowest possible line.. What is important is that it pass through ALL the error bars.. Sometimes it happens that the line you described DOESNOT pass through all the error bars. In that case we take the opposite line ie from the...
  2. usmiunique

    A2 Physics | Post your doubts here

    ur welcome! :)
  3. usmiunique

    A2 Physics | Post your doubts here

    i have done it before.. but i dont have the answer.. but ur method is correct!
  4. usmiunique

    A2 Physics | Post your doubts here

    yes it will be the same answer.. the 2 marks for that are 1 mark for the answer being in the appropriate range and 1 mark for the units!
  5. usmiunique

    Physics Paper 51 Guess

    vacuum pump not just vacuum!
  6. usmiunique

    Physics P5 doubt! Plz help...

    they are asking to find the spacing of the wires in the mesh.. in other words, the value of 'd' in the formula given! just like the diffraction grating experiment, this has to be done.. its CIE.. they can ask anything.. just remember that whatever they ask is from the syllabus.. dont panic and...
  7. usmiunique

    A2 Physics | Post your doubts here

    Yes,You do have to use that *10^-3 in calculating the gradient... and yes d) is the same answer as the gradient!
  8. usmiunique

    A2 Biology | Post your doubts here

    Maybe it should be (final volume-initial volume)/time taken
  9. usmiunique

    A2 Biology | Post your doubts here

    The null hypothesis in this case is that there is no significant difference between the no of moths in grazed and ungraded land.. Meaning that the number of moths should be equal in in all fields.. This is 36+90+114/3=80 which is the expected number of moths in BOTH grazed and ungraded land!
  10. usmiunique

    A2 Biology | Post your doubts here

    There is something related to the data being in the range of mean +/- standard deviation. Actually standard deviation means that the 95% of the data is within the range of mean-s.d.and mean+s.d.. I don't know why exactly we use 0.05 but it is derived from this expression by 1-0.95(the...
  11. usmiunique

    Statistics Paper 62 -- How was it?!

    yes!
  12. usmiunique

    Mathematics: Post your doubts here!

    The probability of a letter being >12g above the mean is 0.94+(0.06/2)=0.94+0.03=0.97 What u are taking is 0.94 which is the probablity of the letters being within 12g of the mean but what u have to take is the probabality of the letters being MORE than 12g above the mean!
  13. usmiunique

    Statistics P6 Help needed

    thanks a LOT!
  14. usmiunique

    Mathematics: Post your doubts here!

    oh... thanks a lot!
  15. usmiunique

    Mathematics: Post your doubts here!

    yes it can b either a 4 digit number or 5 digit numer.. for 4 digt numer u found out 72 possible ways. for 5 digit number, all numbers will be greater than 4000 so that is 5! numbers.. so, the total is 72+5!=192
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