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Physics: Post your doubts here!

Discussion in 'International A And AS Level' started by XPFMember, Sep 29, 2011.

  1. XPFMember

    XPFMember XPC Moderator Staff Member

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    Hi everyone, AsSalamoAlaikum Wr Wb...

    To get things organized in a better way, I am making this thread. As othewise, some queries remain unanswered!

    So post your PHYSICS doubts in this thread. InshaAllah other people here will help me and you all. :D ;)

    NOTE: If any doubts in the pastpapers, please post the link! You can find links here!

    Any Physics related notes and links will be added here in this post. Feel free to provide the links to your notes around the forum, or any other websites! :)
    Thanks!
    Jazak Allah Khair!

    Physics Notes:

    Some links & Notes - by destined007

    As physics p1 MCQS YEARLY Solved [explaination]
    Physics Practical Tips - by arlery

    Notes for A2 Direct Sensing (Applications) - shared by sweetiepie

    Physics Summarised Notes (Click to download)

    AS and A-Level Physics Definitions

    A2: Physics Revision notes - by smzimran

    Paper:5 Finding uncerainty in log - by XPFMember

    Physics Paper 5 tips - by arlery

    Physics Compiled Pastpapers: <Credits to CaptainDanger for sharing this..>

    Here are the compiled A level topical Physics questions in PDF form...

    Paper 1 : http://www.mediafire.com/?tocg6ha6ihkwd

    Paper 2 & Paper 4 : http://www.mediafire.com/?g65j51stacmy33c

    (Source : http://www.alevelforum.com/viewtopic.php?f=15&t=14)
     
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  3. zain tariq

    zain tariq

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    in physics may/june 2002 paper 4 question 4 part c
    how can we predict a change in the period or amplitude of motion whwn we donot know the SHm equation of the motion...like for spring-mass system we know the equation;T=2pisquare root of m/k...through which can predict the effect on period.........but in this question no such equation is given so how to answer it?????
     
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  4. destined007

    destined007

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    In case you haven't noticed, the motion of plank is also simple harmonic.
    So period is proportional to mass. mass decreases period decreases.
    amplitude increases because pull has decreased.
     
  5. destined007

    destined007

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

     

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  6. dhatri2005

    dhatri2005

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    Problems in june 2011 paper 11

    No 25, 27, 29, 32, 35,, 36,37..

    And also can u send me some notes on potential divider, internal resistance along with some working examples which cover the whole chapter...
    Thnks in adv..
     
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  7. wahab305

    wahab305

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    32- 9v is emf..and emf is energy converted into electrical/charge..so its A
    B is wrong because emf is sent to the whole circuit
    C is wrong because we dont know circuit is parallel or series because in series emf divides and in parallel same
    D is wrong because 9v rating is not potential difference
     
  8. wahab305

    wahab305

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    35-simple electricity
    total resistance all in parallel so its R=10/17 ohms
    total voltage or in short emf= v=ir V=10/17 X 5=2.94V
    voltage will be same in parallel so I=V/R R=10/17 V=2.94 I=1.5A
     
  9. wahab305

    wahab305

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    36.......simple concept.....if the resitance decreases the current increases..when u remove the resitor...now its in series meaning the whole current flows through it and will have more current in it...Y and Z resistor will be having lesser current because when there was w resistor current was same so answer is C
     
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  10. wahab305

    wahab305

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    37 is a bit tricky question but its really simple indeed .....u can see that lamp is off when resistance of the wire is less than r1 and r2 because current flows through easier path...so we found the point with the least resistance which is not A B C i-e D because this gives the smallest resitance...cheers.... :oops:
     
  11. a021011

    a021011

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    9702_s05_qp1 - Q16, 22, 36

    Thanks
     
  12. destined007

    destined007

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

     

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  13. Xthegreat

    Xthegreat

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    is this for AS or A2?

    if A2 then this is my question. O/N10 paper 43. Q3b

    thanks.
     
  14. hateexamz

    hateexamz

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    Need help with A2 Physics

    Guyz i need help in the following question frm year 2003 Physics Paper 4 Q1 (c) :%)
     

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  15. destined007

    destined007

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    1)
    d = –4cos(120)= 2 cm

    so the piston will be 2 cm above above AB and moving upward.

    2)d=-4cos(240)= 2 cm
    so the piston will be 2 cm above AB but in this case it has traveled all the way to CD and back towards AB.
     
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  16. destined007

    destined007

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    Re: Need help with A2 Physics

    i)
    change in φ = φ1-φ2= GM/R1-GM/R2= GM(1/R1-1/R2)
    = 6.67 x 10^-11 x 6.0 x 10^24 x(1/(6.4 x 10^6)- 1/(6.4 x 10^3 + 1.3 x 10^4))====> solve this

    ii)
    according to law of conservation of energy:
    ½mv^2=mφ where mφ= change in potential energy
    ½v2 = φ as m cancels
    now just plug in the value of φ from part 1.
     
  17. mufc102

    mufc102

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    Help J04/P1/Q.9,Q.17,Q.18,Q.31
    N04/P1/Q5,16,20
     
  18. Abdulrab

    Abdulrab

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    Can anyone tell me what should i learn for pressure in lquids for As level and please give me the detailed explanation of viscosity in liquids asap !!! thanks
     
  19. Abdulrab

    Abdulrab

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    can someone kindly post the notes on momentum by naushad or any other good teacher ??
     
  20. darkpichu

    darkpichu

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    Re: Physics questions? please?

    Question 10 Please.

    Thanks!
     

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  21. zain786

    zain786

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    Re: Physics Help here! Stuck somewhere?? Ask here! :)

    can some1 give me vector notes for physics for As level plzzz?????
     

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