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  1. usman

    Physics Uncertainty help

    ‘The manufacturer of a digital ammeter quotes its uncertainty as +/- 1.5% +/- 2 digits. (b) The meter is used to measure the current from a d.c. power supply. The current is found to fluctuate randomly between 1.58A and 2.04A. Determine the most likely value of the current, with its uncertainty.’
  2. usman

    Further Maths help (Polynomial Functions and Equations)

    I am stuck in this maths problem. Please somebody help: Exercise 9d Q2(d) of this book: http://books.google.com.pk/books?id=gB5 ... &q&f=false I found the Σ(a^2) and Σ(1/a) successfully correct bt culdn't find Σ(a^2)(B^2) and (Σa)(ΣaB): 'ΣaB(a + B) = 6' is given as the answer but my own answer...
  3. usman

    Revision material for Maths AS and A2 Maths + Further Maths

    http://www.schoolworkout.co.uk/a_level.htm
  4. usman

    Cambridge question papers

    when the examiners distribute the question papers (most often about 5 or 7 mins b4 the exam time starts), it's so easy to look through the pages inside the front page of the ppr coz the print on the papers has such a high contast, although it's not allowed to open the ppr b4 the time commences...
  5. usman

    Mathematics (Mensuration)

    :shock: Given that GHIJ is a square with GH = HI = IJ = GJ = 1cm Also, HJI, GIJ, GIH & GHJ are all identical quadrants centred at I, J, H & G respectively. They are all inscribed in the square GHIJ as shown in the diagram. Now, the question is to find the area of the region ABCD (which is in...
  6. usman

    Chemistry (balancing chemical equations)

    Cu + HNO3 = Cu(NO3)2 + H2O + NO copper + nitric acid = copper(II) nitrate + water + nitrogen monoxide
  7. usman

    aDdditional MaThs

    solve da trigonometric equation sin (2X) = cos(X) plz show da steps also
  8. usman

    Mathematics (sequence & series + Logarithms)

    plz help me out!!! find the nth term of da followin' series 4 me 3,6,11,20,37,70 & 2,3,5,9,17,33 also plz solve dis logarithmic equation 4 me (without using graphs) and find da exact value of x 2^x + x = 50 NB: 2^x stands for 2 raised to the power x
  9. usman

    Biology

    can sbd plz me out my Q is abt plant respiration. i know dat plants repire using their stomata . i also know dat these stomata are closed during night time . so HOW dO pLAnts reSpiRe durin' night time?
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