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  1. S

    A2 Physics | Post your doubts here

    i)1- mean = average is 4.8 + 6 / 2 = 5.4 2- I = Mean V / R 3- from graph, when its sloping downwards its dischraging ii) 1- Q = I x t Current is rate of flow of charge 2- C = Change in Q / Change in V
  2. S

    A2 Physics | Post your doubts here

    When the wavelength is reduced, this means that each photon has more energy now since this means higher frequency by E=hf formula. If each photon has more energy, then definitely the rate of emission must decrease to maintain a constant intensity!
  3. S

    hehe you noticed :P , wish SF could be abit more active :D

    hehe you noticed :P , wish SF could be abit more active :D
  4. S

    A2 Physics | Post your doubts here

    Feel free to post any more questions :) More than glad to help! Just doing my duty as a brother :D Now I can't get my head around Question 9, June 2009! Got too bored thinkin about it...
  5. S

    A2 Physics | Post your doubts here

    Novemer 2007 Question 1 b i ) Centripetal force is the resultant. Here there is no tension because it is an ELASTIC string. So Fc = 5 Newtons which is the weight. Find omega by m x r x omega^2 = 5! Question 4 b) Tangential to the electric field line and opposite in direction since the field...
  6. S

    A2 Physics | Post your doubts here

    June 2007 Question 3 d) i) Fair enough :) Question b ii) Attachment Question 7 b) The Voltage is fixed since it is determiend by the rate of change of flux. Higher resistance, means less Induced Current since R=V/I. Less induced current means less energy loss by motor effect, therefore less...
  7. S

    A2 Physics | Post your doubts here

    November 2006 Question 3 c:- Remeber June 2004 Question 4 c)? Question 6 a ii) It blocks the negative values of ac current. Half wave rectifier. So when pd across diode is maximum (Vnode) then the resistor will have zero volts.
  8. S

    A2 Physics | Post your doubts here

    June 2006 Question 2 b iii) This is a tricky question. First of all you need to find the volume of gas in the Cylinder by the eqn P1V1=P2V2. The trick is that you have to know that the cylinder has to have the same initial amount of volume inside it or else it will collapse due to atm pressure...
  9. S

    A2 Physics | Post your doubts here

    June 2004 Question 4 c) Larger surface area, therefore larger air resistance causing drag which acts as a damping factor reducing the amplitude of oscillations. Question 6:- Thermal energy was required to break some intermolecular force. There was no work done since it doesnt expand much, hence...
  10. S

    A2 Physics | Post your doubts here

    November 2003 Question 4 C :- attachment
  11. S

    A2 Physics | Post your doubts here

    Its asking for a FULLY charged capacitor i.e Vnode which means V maximum .
  12. S

    A2 Physics | Post your doubts here

    Please upload the question papers i.e which year and question, so that I may upload pictures for you! It will be much easier for me to find the questions :)
  13. S

    A2 Physics | Post your doubts here

    http://www.youtube.com/results?search_query=operational+amplifiers&oq=operational+amplifiers&aq=f&aqi=g10&aql=&gs_l=youtube-psuggest.3..0l10.1866997.1870849.0.1870998.22.22.0.11.11.0.194.1371.4j6.10.0. Its like a cosine graph but you flip the negative side on to the positive side. Just like...
  14. S

    mean what? aviation!? YEAH! Its my favorite Hobby!@!

    mean what? aviation!? YEAH! Its my favorite Hobby!@!
  15. S

    Physics: Post your doubts here!

    Q9 Its movin up and down. Lowest point of motion is at the bottom where the speed is zero! Point D from the graph is the lowest point since the speed is increasing and is getting ready to move UP! Q26 Yes , but the question is asking for vibrations not necessarily maximum vibrations! At Nodes ...
  16. S

    Physics: Post your doubts here!

    An ultrasound is emitted to reach the fetus front edge of the head and is reflected back to the source and shown as the first pulse on the graph. The distance travelled is from the source to the front edge back to the source. Another ultrasound is emitted to reach the fetus rear edge of the head...
  17. S

    Physics: Post your doubts here!

    g x h = ms^-2 x m = m^2 x s^-2 Square root = ms^-1 = velocity SI units --> A
  18. S

    Physics: Post your doubts here!

    o_O o_O o_O .... alrighty then! We can see if someone confirms it. Cz there is a chance of error.
  19. S

    Physics: Post your doubts here!

    I think so! Please check it with the marking scheme and tell me :D
  20. S

    Physics: Post your doubts here!

    like I said I ---> A^2 2I ----> 2 A^2 So A = sqauare root of (2A^2) = root 2 A Q3 Use SI units Q13 torque = force x PERPENDICULAR distance There are 2 ways:- 1- find the vertical component of the force 2- find the perpendicular distance by trigonometry Q33 V1 = 5/10 x 2 = 1V V2 = 3/5 x 2 = 1.2V...
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