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  1. S

    Mathematics: Post your doubts here!

    Well, there's no 4(ii) and 4(iii) in this paper , could you update that?
  2. S

    Mathematics: Post your doubts here!

    4) i) Since we know that the speed of each particle is the same as that of the other when Q has reached point B and P has reached point A, our plan of action can be equating the speeds of the particles at those points, and using that equation to find the initial velocity of Q. Firstly, we know...
  3. S

    Mathematics: Post your doubts here!

    (This solution is for 7(ii), not for 7(i), 7(iii) or 7(iv), so in case you'd like a discussion on those too, do post here) From solving part (i), we know that α satisfies the equation (99/100)x = sin(x). We can rearrange this equation by subtracting sin(x) from both sides to give us a zero...
  4. S

    Mathematics: Post your doubts here!

    Let's first discuss what is going to happen here - the masses are connected by a piece of inextensible string - this means that the string will not stretch no matter how much tension is applied on it, and so each part of the string will move with the same speed and same acceleration (if the...
  5. S

    Physics: Post your doubts here!

    Okay, so in this problem, the mass in concern is hanging vertically from a spring, and is initially at rest (since it is displaced from it's rest position). It is then displaced either upwards or downwards (doesn't matter which - if the motion is simple harmonic, the amplitude is the same...
  6. S

    hey man, sorry for the late reply, haven't been online much - i'm fine, thanks for asking! btw...

    hey man, sorry for the late reply, haven't been online much - i'm fine, thanks for asking! btw, what's up now? did you do any exams this november? If so, how did they go?
  7. S

    CHECKPOINT,IGCSE and AS level.

    Six months is a very, very long time - it should be enough to prepare a lot in those six months, provided you prepare daily. The method of preparation shouldn't be just reading the textbooks for 4 months, then stuff the remaining sample papers into the last two months - this method is one of the...
  8. S

    hey, nothing much, waiting for another month to finish off - if college starts, it will be then...

    hey, nothing much, waiting for another month to finish off - if college starts, it will be then ;-) how's stuff after papers? Things going well now?
  9. S

    Physics: Post your doubts here!

    This is from a post that is two pages back, iin case you have any more doubts from this paper, you may find the answers there and on the page after that (p. 578 and p. 579): Q14) When the projectile reaches it's highest point, it has a purely horizontal velocity and no vertical component of...
  10. S

    Physics: Post your doubts here!

    unique111 posted another solution here (that is totally correct, despite that last line!) - I'd posted at around the same time, so the following is a straight "lift" off that comment, in case you'd like a little elaboration. When a total amount of work W is done on any object, the kinetic...
  11. S

    Physics: Post your doubts here!

    Q10) This one has been discussed before, here are a few posts on that: https://www.xtremepapers.com/community/threads/physics-post-your-doubts-here.9860/page-318#post-692472 https://www.xtremepapers.com/community/threads/physics-post-your-doubts-here.9860/page-567#post-828639 Q21) I'm pressed...
  12. S

    Physics: Post your doubts here!

    So the main point here is the specific nature of the formula for efficiency: Efficiency = (Useful Energy Output)/(Total Energy Input) =(Useful Energy Output per second)/(Total Energy Input per second) = (Useful Output Power)/(Total Input Power) The only useful energy we get from this system...
  13. S

    Physics: Post your doubts here!

    Q15) First things first, the law of conservation of momentum says: "....the momentum of any system shall remain constant and unchanging if and only if no net external force acts on that system." So, in most situations in physics, the easiest way to tackle a process is to isolate those parts...
  14. S

    Physics: Post your doubts here!

    Hopefully this post will help. Good Luck for all your exams!
  15. S

    Physics: Post your doubts here!

    Well, if the torque applied to Q is 3.0 Nm, and the only force applying the torque on Q is the upper part of the belt, then the force applying that torque should be the tension in the belt. So, since the torque = (Tension) * (Distance from rotation axis), we can say that (Tension) = 3.0...
  16. S

    Physics: Post your doubts here!

    Since the pattern displayed as λ above repeats itself, that length is equivalent to the time period of the wave (since the horizontal direction is the time-base axis). This is less that 1 centimeter, and actually measuring the length on the paper would give you an answer somewhere close to 0.6...
  17. S

    Physics: Post your doubts here!

    About your earlier query, I have no idea what you said "yeah" for, so here's an answer anyways ;). Either ways, the book shows the graphs for different materials, and since different materials have different behavioral patterns under tension and compression, the graphs for different materials...
  18. S

    Physics: Post your doubts here!

    Haven't I heard of your exploits elsewhere?;) Either ways, do you have a doubt concerning this question? Good Luck for your exams!
  19. S

    Chemistry: Post your doubts here!

    Q20) When esters are hydrolysed using alkalis under reflux, not only is the reaction a one-way reaction (no equilibrium mixture is formed, reaction is complete) but in the end, the ester is split into an alcohol and acid, the ones that formed it in the first place. However, there is a twist...
  20. S

    Chemistry: Post your doubts here!

    26) When a primary alcohol is heated with aqueous acidified potassium dichromate, it is, in general, oxidized. With gentle warming, it is first oxidized to an aldehyde, and if the aldehyde product is further allowed to react in heated conditions where the oxidant (dichromate, in this case) is...
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