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  1. M

    Physics: Post your doubts here!

    than thanks but i am still a bit unsure. does it mean that the resistance between BY BX CX are the same? meaning the total resistance between BY BX CX is the total resistance of the resistors in parallel. is this true?
  2. M

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s09_qp_2.pdf Paper 21 Q7(a)(ii), how do we know its 0.5R? how do we see that it is parallel? and lets say if a third resistor of same resistance is added in parallel, is the resistance AB...
  3. M

    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s11_qp_61.pdf for question 6(i), the upper class boundaries are for example 100 or 100.5? http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s13_qp_63.pdf 6(i), upper class boundaries are 40 or 40.5...
  4. M

    Statistics S1 post your doubts here

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s11_qp_61.pdf for question 6(i), the upper class boundaries are for example 100 or 100.5...
  5. M

    A level Biology: Post your doubts here!

    Thanks! But I would also like to know, what are the cells next to the sieve tube element? Those which dont have any contents. Are they the companion cells or something else? Because I have also seen before sieve tube elements with no contents
  6. M

    A level Biology: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20%289700%29/9700_s05_qp_2.pdf Q2 (a)(i) is the one with dots the phloem sieve tube?
  7. M

    Physics: Post your doubts here!

    pls help me with this thx :)
  8. M

    Chemistry: Post your doubts here!

    hydrogen sulphide reacts with water according to the following equation. H2S(aq)+ 2H2o(aq) --> <--- (reversible) 2H3o+(aq) + S2- (aq) Which of the following aqueous solutions when added would cause the system at equilibrium to shift to the left? A. NH4Cl B. Na2CO3 C. CH3COONa D. NH3 Pls teach...
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