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  1. ni2005

    Mathematics: Post your doubts here!

    only for the value t=0 that only one solution is correct, if we replace t by any other value, then the value of H obtained will satisfy both solutions :unsure:
  2. ni2005

    Mathematics: Post your doubts here!

    In an industrial process, a control mechanism supplies heating and cooling in such a way that the temperature H and the time t (each measured in suitable units) are related by the differential equation: dH/dt = (100 - H)³
  3. ni2005

    Mathematics: Post your doubts here!

    hehehe! i've been able to work it out up to here, but i think when we take square root, we will have to take the negative, because if u replace for t=0 in your answer, H will be 99, not 101
  4. ni2005

    Mathematics: Post your doubts here!

    e i'm getting the answer u got too, mayB it's just a printing error in the answer key
  5. ni2005

    Mathematics: Post your doubts here!

    assalamualaikum!! can u please help me with this? given the differential equation: dH/dt = (100-H)^3 solve the differential equation, given tht H=101 when t=0, giving H in terms of t. my answer is: H= 100+ (1/(2t+1)^0.5), i've taken negative square root, becasue then when t=0, H=101, but the...
  6. ni2005

    CIE maths 9709 A-level help!!!

    given the differential equation: dH/dt = (100-H)^3 solve the differential equation, given tht H=101 when t=0, giving H in terms of t.
  7. ni2005

    Mathematics: Post your doubts here!

    it is maths A-level
  8. ni2005

    Mathematics: Post your doubts here!

    jazakallahu khairan!!!! but could u please elaborate a little more...? i didnt really understand how u did the discriminant part.
  9. ni2005

    Mathematics: Post your doubts here!

    assalamualaikum! i have a question, it's a very old one (june 89), please help me! The equation y= ax^2 - 2bx + c , where a,b and c are constants, with a>0. a) Find, in terms of a,b and c the coordinates of the turning point on the curve. b) Given that the turning point of the curve lies on the...
  10. ni2005

    physics november 2012

    i did the diagram of a relay, i 4gt the question too but there was no mention of reed switch, just "draw the diagram of a relay and explain how it can be used to switch on the motor" even i wrote pretty much the same thing about the pressure question, the molecules had to apply a bigger force...
  11. ni2005

    physics november 2012

    i got 630.something degree celsius
  12. ni2005

    physics november 2012

    yeeaahh!!! but i got it wrong!:(anyways, what about the energy changes, the bungee jumping one?
  13. ni2005

    physics november 2012

    i got 2.5 A there was another question about charge, what is the number of particles?
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