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  1. queen of the legend

    Physics: Post your doubts here!

    you minus them up because they are acting in different direction. so one negative is for direction and one is for the velocity. you can either think of it this way or you can use this better way for perfectly elastic collisions only where this equation applies Ua-Ub= - (Va-Vb)
  2. queen of the legend

    Physics: Post your doubts here!

    be specific please! if you have a question you dont understand post it down
  3. queen of the legend

    Physics: Post your doubts here!

    speed of separation is actually difference in velocities of ball S and B . velocity of B = -0.8 , and Velocity of S= 1.6 so, 1.6 - (-0.8) = 2.4 (y)
  4. queen of the legend

    Physics: Post your doubts here!

    for question 7bii : its very easy . if you were able to solve 7 part a then part b is just continuation. ok we know that change in momentum (delta)P= F x (delta) t so just substitute part a ii for delta P . you already got F= Eq , and t= L/v ...........so , (delta P = F.t ) that is P= EqL/v...
  5. queen of the legend

    Physics: Post your doubts here!

    draw tangent to the curve at 0.4s and find out the gradient that is equal to speed.
  6. queen of the legend

    Physics: Post your doubts here!

    post your question please!
  7. queen of the legend

    Physics: Post your doubts here!

    which variant do you mean and please post the mark scheme along !
  8. queen of the legend

    Physics: Post your doubts here!

    there are no specific quantities that should be learnt as i have been told ....i think you just have to guess them and i think its just stupid
  9. queen of the legend

    Physics: Post your doubts here!

    anyone having a doubt in paper 2 for AS can contact me but plss post the question paper and mark scheme along!
  10. queen of the legend

    Physics: Post your doubts here!

    for question 5 a: since I=V/R , and we know that v=12 and R is total resistance in the circuit (6 for resistor and 12 for max. variable resistor's resistance) so substitute and u get 0.67A. just to make you understand the concept better , Vin is constant, so increase in amount of R decreses the...
  11. queen of the legend

    Physics: Post your doubts here!

    but the question is not about component of vectors ?! its about uncertainty isnt it ?
  12. queen of the legend

    Physics: Post your doubts here!

    for question 3aii : its very simple if u read the text book you can find detailed explanation about this topic, anyhow .. take a ruler and put it on the line of the graph so that when line starts deviating from straight path its the point that should be marked L where hook's law will not apply...
  13. queen of the legend

    Physics: Post your doubts here!

    thanks a lot ! i appreciate it :)
  14. queen of the legend

    Physics: Post your doubts here!

    question 7 b(iii) from may/june 2009 paper 2 first variant. i need explanation
  15. queen of the legend

    Physics: Post your doubts here!

    In part b air resistance is taken as negligible. since F=crv which is the resistive force calculated as 3.6x10^-5 N is very very small compared to wieght of the ball which is equal to 0.15N . this justifies neglectin air resistace in part b
  16. queen of the legend

    Physics: Post your doubts here!

    since displacemnt is distance covered in particular direction, when a car travels suppose from point A to B and goes back to A its total distance is AB + BA, but the DISPLACEMET is zero from point A. i hope u understand now !
  17. queen of the legend

    thx :)

    thx :)
  18. queen of the legend

    Physics: Post your doubts here!

    I cannot understand these two question: 4b and 5 all from may/june 2009 first variant paper 2 some1 explain pls
  19. queen of the legend

    Physics: Post your doubts here!

    i need help in question question 4c, may/june 2008 paper 2 asap pls where did value of delta h come from ?! http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20%289702%29/9702_s08_qp_2.pdf mark scheme...
  20. queen of the legend

    Physics: Post your doubts here!

    may/june 2003 , paper1 , question : 5, 11, 17, 19, 22, nd q.40 please help!
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