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  1. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    As I said before, ALWAYS read full questions. :P
  2. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    They haven't asked about downhill so you don't need to mention it! :giggle: But yes, when going downhill, the cyclist will accelerate.
  3. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    The kinetic energy is constant but where does the kinetic energy come from? Chemical energy. Its not the answer, I was telling usama321 about what happens.
  4. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    ALWAYS read the question first, although I do the same sometimes, come to the answer directly. :rolleyes:
  5. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    They've asked only for uphill so, chemical energy ---> kinetic energy + gravitational potential energy + some heat energy.
  6. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Key word here is CONSTANT SPEED that means kinetic energy remains the same throughout. Now, the cyclist has CHEMICAL ENERGY in the body that is used to pedal the bicycle, this chemical energy is converted to kinetic and gravitational potential energy, the kinetic energy is constant, the...
  7. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Please do. So we can get off the current topic as well. :p
  8. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    We never wash out flasks with acids/alkalis. We only rinse burettes with the solution to remove the water, we rinse it several times, and we reduce the error as far as we can! Excess solution of the acid in the burette is not an impurity, water is.
  9. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Exactly! I calculated it the same way. As I've mentioned above, C should be the answer!
  10. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Acid contains water. Adding more water to it makes it dilute, you agree, right? The water present in the burette is rinsed by the acid. The acid mixes with the water in the burette during rinsing; on the addition of the water in the burette the acid becomes more dilute hence removing the water...
  11. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    I'm not saying I'm correct. Errors are going to be introduced in both ways, but leaving water as is will, according to what I know, bring a larger error. The acid in a way washes away the water (the water makes the acid more dilute becoming part of the acid) when we rinse with it, therefore...
  12. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    Suchal Riaz usama321 TheLeagueofShadows This is a forum for open discussion and help, if one person has one view and the other has one view, please try to reach mutual consensus on the matter instead of blaming or criticizing each other. That's the purpose of this thread! :) But I do agree with...
  13. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    usama321 TheLeagueofShadows Ok, so I have read both points of the argument. My final evaluation of the problem would be: The purpose of titration is to find the concentration as accurately as possible. We use the water to clean the burette of any impurities and unwanted substances. The use of...
  14. Saad Mughal

    Biology; Chemistry; Physics: Post your doubts here!

    If I'm not mistaken, then the answer is C. 32 g.
  15. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    Amount of Commission = (5/100*15000) + (6/100*10000) = 750 + 600 = Rs.1350 I don't know what that means but I guess, -3q+26=4q-9 35=7q q=5
  16. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

  17. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    For the partnership question, Ratio of investment= 8000:6000:5000 Ratio of investment=8:6:5 Converting to fractions, 8/19, 6/19, 5/19. A receives = 8/19*12000 = Rs. 5050 B receives = 6/19*12000 = Rs. 3790 C receives = 5/19*12000 = Rs. 3160 All answers are correct to nearest 10th of a number...
  18. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    Did you completely solve it?
  19. Saad Mughal

    Maths, Addmaths and Statistics: Post your doubts here!

    If you're looking for challenging questions then I'll send you some from my book, they are a little harder than the past papers. As far as the classified questions are concerned, I've done permutation and combination and have found nothing very difficult but I haven't completed relative velocity...
  20. Saad Mughal

    I posted this long ago. :O Thanks for the reply anyway but I found resources to do the above and...

    I posted this long ago. :O Thanks for the reply anyway but I found resources to do the above and I have the required information for the topics and have done the past papers. Thanks anyway. :) Don't worry if I have any problems, I'll ask for help. ;)
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