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  1. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    The only chapter that taunts me. :mad: I'm afraid I can't help you because I am not very good at relative velocity. Sorry. :( However, I did manage to do part (a) and I'm getting the same answer, and for (b) shouldn't the distance be 24 km? Distance AB = Distance Traveled by B - Distance...
  2. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    x-2(3x-2(x+1)+5)=16 x-2(3x-2x-2+5)=16 x-2(x+3)=16 x-2x-6=16 -x=22 x=-22
  3. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    Is that a minus sign before the 5?
  4. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    Here you go.
  5. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Ok, in simple words :p The reaction b/w HCl and CuCO3 is, CuCO3 + HCl ---> CuCl2 + H2O + CO2 The hydrogen from the hyrdochloric acid displaces the copper in the cooper (II) carbonate since hydrogen is more reactive than copper. This will form carbonic acid and copper (II) chloride. The carbonic...
  6. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    :)
  7. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    A centripetal force is a force that acts towards the center of a circular path, it is responsible for making bodies travel in circular motion.
  8. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Both have the answer A. In 6, the motorcyclist is moving in circular motion hence a centripetal force acts on the motor cycle, since the motor cycle is leaning towards the left, the centripetal force of circular motion is A. In 7, the force at P produces a clockwise moment, so, applying the...
  9. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Well, I'm not quite sure of this, but from what I know, the hydrogen being more reactive will replace the copper in the solution (that will lead to copper (II) chloride being formed), and hydrogen carbonate is soluble so it will break down into ions CO3- + H+ ----> CO2 + H2O (balanced eq. is CO3...
  10. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    :)
  11. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    I had the same feeling when I first came across them (I'm still no good but I just get what's in the syllabus.. barely) :P
  12. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Actually, electronics (the whole section) seems complicated but its questions in past papers are very easy so perhaps it will be blessing in disguise if it comes!
  13. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Thanks. I got it. The weight is at the center and not B hence the upward force = 0.
  14. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    For, part (f) and (g) I had precisely the same answers but the problem is that for (f), the answer is 0 (no force acting upwards) and for (g) the answer is 0.5 m not >0.5 m or equivalent. These are weird questions (stephen pople's book), I'll ask my teacher. Thanks Anyway! :)
  15. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    :)
  16. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    It's complicated. I know. :P
  17. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Here you go, http://revisionguide.blogspot.com/p/physics-atp.html And notes for ATP by sweetiepie,
  18. Saad Mughal

    O-level Notes Center

    robinhoodmustafa In the physics section, bistable/astable circuit notes are missing. I've found 2 of them, add them please; these circuits are rarely found in books so these notes will be helpful to those seeking them.
  19. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Yeah, I guess I'll give them to the notes centre. This circuit is connected to another circuit (its in the attachment) so the initial result comes from the inputs of another circuit.
  20. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    I'm attaching 2 files if you guys still don't understand.
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