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  1. S

    Important SAT 2 material(like practice tests) free!

    Right, then. When light passes from one medium to another, the rate at which the light travels through the new medium (i.e. it's speed in that new medium) changes, depending on certain properties of that medium. So, that property is given a value we commonly call it's "refractive index", and it...
  2. S

    Have you done any practice papers recently?

    Have you done any practice papers recently?
  3. S

    Hey, sorry for the late reply - good morning to you, too!

    Hey, sorry for the late reply - good morning to you, too!
  4. S

    what papers are you taking, bro?

    what papers are you taking, bro?
  5. S

    Have you completed the syllabus for the papers ur taking?

    Have you completed the syllabus for the papers ur taking?
  6. S

    Hey, what's up?

    Hey, what's up?
  7. S

    Please Help.

    I've done the 2012 O/N paper, so I can help out there - I can't find the 2013 October/November paper, or the marking scheme, or the supporting files, so i'm sorry on that front. If I do find them, i'll try my hand at it. I'm not sure why you're having a problem with the importing, it's going on...
  8. S

    Mathematics: Post your doubts here!

    When particle P changes the direction of it's motion, it's velocity turns from negative to positive or positive to negative (since the motion is only along a straight line, it can only travel in two ways). However, before that changeover happens, the velocity of the particle has to equal zero -...
  9. S

    Physics: Post your doubts here!

    Let's think of this question in terms of net force: We know that the boy accelerates at a constant rate until his velocity reaches 5.6 ms^-1. In part (ii), his speed is 4.5 ms^-1, so he hasn't yet finished accelerating. From the earlier part, we know that the acceleration of the boy is 1.12...
  10. S

    Physics: Post your doubts here!

    Well, for any stationary object, i.e. an object in equilibrium, the following two conditions have to be fulfilled: i) No net force must act on that body (so that the centre of mass does not accelerate, or if the object is stationary, start moving); ii)No net torque must act about ANY point...
  11. S

    Same here, btw ;-) Yeah, i've listened to it before, pretty chill song! You've heard Guns N'...

    Same here, btw ;-) Yeah, i've listened to it before, pretty chill song! You've heard Guns N' Roses Paradise City?
  12. S

    Physics: Post your doubts here!

    You're welcome, but what about the second question (unless you've got it sorted out already)?
  13. S

    Physics: Post your doubts here!

    Q1) Suppose the particles are separated by a particular distance x, and their charges are as you have mentioned, one with a charge "q" and another with charge "Q-q". Then, the coulomb force acting between them would be equal to: F(Coulomb) = kq(Q-q)/x^2 Now, we want to know what values of q...
  14. S

    Mathematics: Post your doubts here!

    Bro, if you've got the tech, no probs(y)
  15. S

    Mathematics: Post your doubts here!

    Since the box is a prism, the cross-sectional area is constant from bottom to top, so the total volume is simple to calculate as: Volume = Area of Cross Section * Height = (0.5 * r^2 * θ) * h = 0.5hr^2 Since we are given this to be 300 cm^3, we can equate the two to...
  16. S

    Please Help.

    If you look at the marking scheme, the following details are mentioned: Book required lookup (C2:C10) Value=$A$2 [1] Source=Book Orders.csv [1] Vector=a2:a21 [1] Result=c-k2:c-k21 [2] Use of if [1] So...
  17. S

    Please Help.

    Here's a possible solution (courtesy my dad): The assumed solution would be to convert the entire CCNumber column into integers (without decimal figures) and then use the LEFT() or RIGHT() functions to obtain the first 4 characters of each CCNumber. After that, you look up that value in the...
  18. S

    Physics: Post your doubts here!

    It depends on the two bodies involved. For example, if you have a circular ring (or a symmetrical one, it can even be an oval for that matter) somewhere in space and a particle is placed at it's center, the gravitational force on it is Zero. As that particle is moved away from the ring, the...
  19. S

    Physics: Post your doubts here!

    The two most important things to note for this question are as follows: i) Since the string is "mass-less", the tension in every part of the string is the same. In other words, the string pulls each block with the same force; it pulls the 2.0 kg block to the right with the same force as...
  20. S

    Physics: Post your doubts here!

    Q25: The image of a wave has been given, and so has the direction it is traveling in. Note that since this is a transverse wave and the disturbances are traveling from left to right, the particles at any point are vibrating in a direction perpendicular to that propagation. In other words, if...
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