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  1. sudeep1097

    Physics: Post your doubts here!

    In 14 we know that power = force x velocity. Change the question so you get the equation with k on one side and other quantities on other side now substitute force = power/velocity in the new equation to get the answer clear?? In 29 K.E = 1/2 x m x v^2 and Force = eE. Substitute these in the...
  2. sudeep1097

    Mathematics: Post your doubts here!

    5(i) From what i have learned. for |z-i|=2 draw circle with center at 0,i. z is at o,o and -i means that now center point is 0,i if it was +i then center point would be 0,-i just opposite. Same for real numbers i.e |z-1| would mean starting point is 0,1. Now the 2 is radius. SO |z-i|=2 means...
  3. sudeep1097

    Physics: Post your doubts here!

    You mean vertical component of H and W are cancelled by upwards vertical componenet of T
  4. sudeep1097

    You too! :)

    You too! :)
  5. sudeep1097

    Physics: Post your doubts here!

    Hello! Can anyone make it clear to me why ultrasound is pulsed and not continuous in ultrasound scan??
  6. sudeep1097

    m/j 2014 exams ?

    Chill out! :) It's better to panic now then just right before the exams right? Best of luck for your exams! (y) Hope 1 month preparation is enough to get A* haha
  7. sudeep1097

    Thanks for the follow :)

    Thanks for the follow :)
  8. sudeep1097

    m/j 2014 exams ?

    haha same infact I am panicking! :cry:
  9. sudeep1097

    m/j 2014 exams ?

    prepared?
  10. sudeep1097

    Describe the person above you in one word :D

    Dumb :P
  11. sudeep1097

    m/j 2014 exams ?

    a levels
  12. sudeep1097

    Physics: Post your doubts here!

    9 (B) change in momentum = m v1 -m v2 = 0.1 x 20 - 0.1 x 9 (-30) (since direction opposite velocity sign changes into -ve for 30 m/s)= 5 10 (C) momentum is conserved. for x momentum (p) = m x 2v. for y momentum (p) = 2m x v. I supposed v so p is equal for both. now K.E = 1/2 x m x v^2. Finally...
  13. sudeep1097

    m/j 2014 exams ?

    yup me! Maths(mechanics and p3) physics(all) biology(p4 and p5) and chemistry(all)!
  14. sudeep1097

    Now, total time = 6 hours = 360 minutes 10 dm^3 air is pulled in 1 minute i.e. 0.01 m^3 so in...

    Now, total time = 6 hours = 360 minutes 10 dm^3 air is pulled in 1 minute i.e. 0.01 m^3 so in 360 minutes 0.01 x 360 = 3.6 m^3 air. We have got till now, 3.6 m^3 air contains 10080 pollens hence, 1 m^3 air contains 10080/3.6 = 2800 pollens
  15. sudeep1097

    Okay! First of all ignore the area of opening because only area of adhesive surface matters i.e...

    Okay! First of all ignore the area of opening because only area of adhesive surface matters i.e. 10x42 = 420 mm^2 Now, student's data suggests 0.25mm^2 contains 6 pollens so 1 mm^2 contains 6/0.25 = 24 pollens. Hence, 420 mm^2 contains 420 x 24 = 10080 pollens
  16. sudeep1097

    Physics: Post your doubts here!

    When decay takes place two gamma rays are emitted and by law of conservation of energy, energy must be conserved. So the π which is decaying from rest must emit two gamma rays which have same momentum but in opposite directions and since momentum is conserved energy is conserved.
  17. sudeep1097

    Physics: Post your doubts here!

    These may be already answered check the thread! page 373!
  18. sudeep1097

    Mathematics: Post your doubts here!

    It means you have to draw a graph for the equation and show that it intersects with x-axis at only one point.
  19. sudeep1097

    Physics: Post your doubts here!

    Gamma particles have no mass and that 2 means 2 gamma particles not 2 moles gamma particles like in a a chemical equation. Gamma particles are electromagnetic waves (photons) hence have no rest mass like other electromagnetic waves. You cannot use stoichiometrice ratio like in chemistry and...
  20. sudeep1097

    Physics: Post your doubts here!

    B is in the wron I haven't studied O levels but i think these are the answers. (i and ii) B is in the wrong drawer. As B has resistance 221 ohm. I am hoping you can draw the circuit. All the resistors have different values since they have tolerance and the voltmeter doesn't have infinite...
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