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  1. S

    A2 Physics | Post your doubts here

    two different formulas, mv^2 /r and m r w^2... depends on what you are using!
  2. S

    A2 Physics | Post your doubts here

    I would sugguest, waiting for questions to be solved first then post more...Because you are pushing your old questions up and people may not notice it.. Thank you. 7 b) from the eqn in part a) , v= E / B . Since v , B , E are not changed. Then there is no deflection in the path of the alpha...
  3. S

    A2 Physics | Post your doubts here

    Will start answering it in 30 minutes, hold on!
  4. S

    A2 Physics | Post your doubts here

    just post it in here, much higher chance of answers in time and people can correct each other... Dont worry , period of a day is 24 hours - 7 hours sleep - 2 hour food breaks - 3 hour fun breaks = 12 hours of pure study i.e 7 papers x 4 days = 28 papers ---> meaning you got time for finishing...
  5. S

    A2 Physics | Post your doubts here

    because E m f by lenz law is minus rate of change of flux!
  6. S

    A2 Physics | Post your doubts here

    I am agreeing with you, did you find anything yet ? :) Although I am a little confused whether it should touch the first dotted axis or not . If it should not then I guess this is not correct...
  7. S

    A2 Physics | Post your doubts here

    You seem very confident, yet having problems interpreting the problem :D Can you continue your curve if current has not been switched off? Current would be sinosoidal and EMF too! but with a 90 degree phsa shift. Transformers always output an alternating e.m.f , but you sketch does not show any...
  8. S

    A2 Physics | Post your doubts here

    thats the problem , i cant seem to agree with your explanation. Because I am reluctant why it cant be somehow convex rather than concave. Meaning it should be like the shape of an alternating voltage i.e how did you the rate of decrease of current decreases rather than increase with time!
  9. S

    A2 Physics | Post your doubts here

    Have some problems getting this clear... The gradient of the current graph looks undefined at the beginning? tangent to that point is vertical? means emf shouldnt touch the axis?
  10. S

    A2 Physics | Post your doubts here

    Then just flip your monitor upside down :P If voltage across resistor is increasing, voltage across diode is decreasing and vice versa. When voltage across R is Max , voltage across diode is zero and vice versa again! Kirchoff's Voltage Law!
  11. S

    A2 Physics | Post your doubts here

    A Analogue to digital converter is used where samples are taken at certain intervals of time i.e sampling rates to convert the decimal number into binary digits made of a certain number of bits. 2^3 / 2^2 / 2^1 / 2^0 8 4 2 1 Example 9 is 8 + 1 so the binary digit is 1 0 0 1 Hope you got it :)
  12. S

    A2 Physics | Post your doubts here

    Then post more hard questions for practice please :D Half wave Rectifier:- http://en.wikipedia.org/wiki/File:Halfwave.rectifier.en.svg Full wave Rectifier:- http://en.wikipedia.org/wiki/File:Gratz.rectifier.en.svg
  13. S

    A2 Physics | Post your doubts here

    please make some brief elaboration on the first part of the emf of the graph... why is it somehow as a sine graph rather than a cosine graph? why couldnt it be a straight line sloping downwards? How do we know if the rate of decrease is constant or the rate of decrease is increasing/decreasing...
  14. S

    A2 Physics | Post your doubts here

    1.This is because there is no change in kinetic energy, heat is taken in to break intermolecular forces only. 2.This is because there are more bonds to be broken when boiling so more heat is required. 3.This is because the high energy particles take energy from the lower energy particles that...
  15. S

    A2 Physics | Post your doubts here

    Clearest video I found on the wave nature of particles on both macroscopic and quantum scales! Will show you all the screen patterns of particles :)
  16. S

    A2 Physics | Post your doubts here

    It depends, -If its through a carbon / graphite filter , you draw concentric circles like a field, but I need to check if the seperation of the lines is the same or not...but prollly increasing. -If its through a single or double slits, it will be similar to that of light as discrete lines ...
  17. S

    A2 Physics | Post your doubts here

    wajazak mithluh :) my duty as a brother ;)
  18. S

    A2 Physics | Post your doubts here

    http://www.batesville.k12.in.us/physics/phynet/mechanics/circular%20motion/centforce_and_earth.htm This will elaborate more on why the normal reaction is less than the person's weight when he/she is standing at the equator / plane of spin!
  19. S

    A2 Physics | Post your doubts here

    I wanna share this theory with you. " Internal energy is determined by the state of the system " Internal energy is determined by the values of the current state and is independent of how the state is arrived at. Thus if a system undergoes a series of changes from one state A to...
  20. S

    A2 Physics | Post your doubts here

    Question:- If an object is in space and is on the AXIX of the Earth's Spin. Does that mean that the centripetal force is zero? So this means that a person at the poles will have a normal reaction equal to that of his weight, while a person at the equator has a normal reaction less than his weigh...
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