• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. S

    Physics: Post your doubts here!

    Suppose you are standing x meters away from a sound source (turned off), and the speed of the waves = v. Also suppose wavelength = λ. If it is turned off, you will hear a crest of the wave in time x/v seconds. The wave will take a time of λ/v to completely register in your ear, so you will...
  2. S

    Physics: Post your doubts here!

    Wow, is this a good question! The trick here is to simply work through all the steps, and see what you get. First step is in find the extension from the values we know. The Young's Modulus Formula is Y = Fl/Ae (where F is the tension, l is the original, unladen length of the sample, e is the...
  3. S

    Physics: Post your doubts here!

    Q11) The object hits the wall with a speed v, and rebounds with the same speed, but a velocity in the opposite direction. Kinetic Energy does not depend on the direction of an object's velocity, just the magnitude of that objects velocity, i.e. the speed. Therefore, since the speed remains the...
  4. S

    Physics: Post your doubts here!

    On checking the marking scheme the answer is D - where did you find the answer to be A? Either ways, the working for this question can be very easy if you work in a particular manner; first point is that Force = Δ(mv)/Δt, and if we take Δt to be 1 second, the equation is reduced to it's...
  5. S

    Physics: Post your doubts here!

    An important point concerning elastic collisions is that the relative speed (relative is a very important word here) is the same for the colliding objects both before and after the collision occurs. Interestingly, this is independent of mass. Suppose you are seeing the entire situation from the...
  6. S

    Really?! Huh, i don't think so. I had started typing the message, then i searched on Google for...

    Really?! Huh, i don't think so. I had started typing the message, then i searched on Google for that equation, and then I typed it, but i don't think it was 30 minutes. Hmmm...
  7. S

    Physics: Post your doubts here!

    This is the formula that relates Intensity I to Amplitude x: I = 2(π)^2 * ρ(ƒ)^2v(Δxmax)^2 Where I = Intensity, ρ = density of medium where wave is travelling, ƒ = frequency of vibration, v = speed of propagation of wave and Δxmax= maximum amplitude. (This is from an advanced website, paper...
  8. S

    Physics: Post your doubts here!

    Because this question uses basic concepts. It is very important to fully understand all the basic concepts, because the most complex problems can still use basic concepts. Maybe I overdid it on this one, but still - I read somewhere that PhDs teaching at Uni level teach freshers and first year...
  9. S

    Physics: Post your doubts here!

    First point to note here - the block will only accelerate down the plane, not perpendicular to it. Therefore, there is only one component of acceleration, that is down the slope. Let's apply Newton's Second Law down the inclined plane: The component of gravity pulling the block down the plane...
  10. S

    Physics: Post your doubts here!

    No, it isn't. The terminal P.D. is the potential difference across the terminals of any battery. If that battery has no internal resistance, then the terminal P.D. is equal to the EMF or the Voltage rating of the battery. If the battery has an internal resistance, since that resistance is...
  11. S

    Physics: Post your doubts here!

    I can't understand what you mean by "on either side of X and Y is 8+4=12", could you explain? Anyways, when they are asking for the potential difference between X and Y (which are points in the middle of the upper and lower branches respectively) they are asking for the (Potential at X) -...
  12. S

    Physics: Post your doubts here!

    Q33) The potential difference across the Upper branch is equal to the potential difference across the Lower branch; another assumption we can make is that the potential at P is 12 Volts, and the potential at Q is 0 Volts. So, we can take each branch separately as follows: Potential Difference...
  13. S

    Physics: Post your doubts here!

    Google Search, then copy-paste ;)
  14. S

    Physics: Post your doubts here!

    27) Think about it this way - for an electromagnetic wave (or ANY transverse wave, or even a longitudinal wave) regardless of the wavelength and frequency, regardless of all other properties of the wave, as long as it is periodic (as long as it repeats itself in a certain time period), the...
  15. S

    Physics: Post your doubts here!

    26) C is just a random value I included; we know that the value of A changes by a factor; from A it becomes (something) * A, not (something) + A. So, I just decided to make that (something) C - it isn't part of the question, it is just something I put it. You will get the same answer by...
  16. S

    Physics: Post your doubts here!

    25) There is an equation that states that "the intensity of a wave is proportional to the square of its amplitude". Therefore, doubling the amplitude increases the intensity by a factor of 4; tripling the amplitude increases the intensity by a factor of 9. So, for a particular point, we can...
  17. S

    Physics: Post your doubts here!

    The marking scheme is really confusing; the two tables shown in the marking scheme for Part 2 (b) show the ratio m/(m+M) in the first column and v^2 in the second column, so don't check your values of v in there, you have to check your values of v^2 there. In the question body, it is written...
  18. S

    my secret :P

    my secret :P
  19. S

    not in Asia (most of my answers come at wonky times for the same reason!) BTW I took Bio, ICT...

    not in Asia (most of my answers come at wonky times for the same reason!) BTW I took Bio, ICT and Eng in 2012 O/N and Physics, Math and Chem in M/J 2013 ;-)
  20. S

    i'll reply in some time, have to go for dinner :P

    i'll reply in some time, have to go for dinner :P
Top