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heena

  • 2 years ago

ok they had given pendulum done 100 oscillation its amplitude reduced to 1/3 of initial value. what will be its amplitude if it completes 200 oscillation

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  1. JamesJ
    • 2 years ago
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    100 oscillations in what time period?

  2. heena
    • 2 years ago
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    dont solve just tell me ur vies dat how will u suppose to handle this ques plz plz but dont solve

  3. heena
    • 2 years ago
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    *view they didnt give time period so we can assume it constant??

  4. JamesJ
    • 2 years ago
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    I still don't understand the question. Is it this: "In a given time period a pendulum completes 100 oscillations. "Then the pendulum has its amplitude decreased by 1/3 and it completes in the same time period 200 oscillations." If so, what's the question here.

  5. heena
    • 2 years ago
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    no they didnt said anything abu time period even i m asking can we assume it constant

  6. JamesJ
    • 2 years ago
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    What is true about a pendulum is that if you increase the angle of maximum oscillation more than about 10 degrees, the period of the pendulum increases. The reason for that is in calculating the standard period of pendulum, we use a small angle approximation \[ \sin\theta \approx \theta \] which only holds for small angles \( \theta \). The wikipedia article has good animation of what happens when \( \theta \) gets large and there you can see the period increases. http://en.wikipedia.org/wiki/Pendulum#Period_of_oscillation This would explain the effect described in this set up.

  7. heena
    • 2 years ago
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    but james my ques how i m gonna solve it ? any hint or idea even i m trying hit and try but u can tell ur one too that it might like dis?

  8. heena
    • 2 years ago
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    u guys have any idea?

  9. heena
    • 2 years ago
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    it is saying that when pendulum completes its 100 oscilation its amplitude reduced to 1/3 of its inital means 2/3 is remain of apmlitude i guess and then they are asking if it completes 200 oscilation than what will be the value of amplitude

  10. hosein
    • 2 years ago
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    i think amplitude decrease

  11. heena
    • 2 years ago
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    i need a value too.. :P

  12. JamesJ
    • 2 years ago
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    Oh, I see. Precisely what is the amplitude, in angular terms. Use the first couple of terms of this expansion:

  13. heena
    • 2 years ago
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    god.. u r kidding james by showin me dat short formula rit ...

  14. heena
    • 2 years ago
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    i thinks in that i m not getting they are squaring or wat?? inside the bracket?

  15. Shayaan_Mustafa
    • 2 years ago
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    hello. i am back.

  16. hosein
    • 2 years ago
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    with 100 oscillation amp 1/3 decrease so with 200 oscillation again decrease 1/3 im not sure

  17. JamesJ
    • 2 years ago
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    You know that T decreases by a factor of a 1/2. Use that formula to find what value of theta_0 will make that happen.

  18. Shayaan_Mustafa
    • 2 years ago
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    may i help here? May i could do something?

  19. heena
    • 2 years ago
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    yea solve diss ques

  20. Shayaan_Mustafa
    • 2 years ago
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    ok wait. let me analyze.

  21. heena
    • 2 years ago
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    i wasted 15mins in this ques yar

  22. heena
    • 2 years ago
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    plz quick

  23. hosein
    • 2 years ago
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    james formula is correct?

  24. heena
    • 2 years ago
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    yea but unable to aplly a i nvr heard abu dat one

  25. hosein
    • 2 years ago
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    james formula abu period of oscillation,not amplitude

  26. Shayaan_Mustafa
    • 2 years ago
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    now what i understand. BUT THIS QUESTION LOOKS INCOMPLETE. look here first calculate time period using T=1/f T=1/100 T=0.01sec

  27. heena
    • 2 years ago
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    guys i need the ans 1/9 nw think ow can we get

  28. heena
    • 2 years ago
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    f=? y u put ocilation??

  29. hosein
    • 2 years ago
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    idont understand u'r sentence?

  30. heena
    • 2 years ago
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    i mean the ans of this ques is 1/9 now just hit and try to get this ans

  31. hosein
    • 2 years ago
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    how can you got it?

  32. heena
    • 2 years ago
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    no i dont got dat i had ans key :) and my ans is not matching dats why i ask for help..

  33. Shayaan_Mustafa
    • 2 years ago
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    now use the displacement equation, y=Asinwt where w is the frequency. y=(1/3) sin(100*0.01) y=(1/3)(0.0174) y=0.005m now use this displacement as, 0.005=Asin(200*0.01) 0.005=A(0.0348) A=0.143 :( is this wrong?

  34. Shayaan_Mustafa
    • 2 years ago
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    there is no other way to do it. so it tried my best. and result is before you. :((

  35. heena
    • 2 years ago
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    i want to cry.. :"( )............ )............................ god if this kind of ques coming on exam i m gonna dead

  36. Shayaan_Mustafa
    • 2 years ago
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    what is exact answer?

  37. Shayaan_Mustafa
    • 2 years ago
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    i am sure it is right.

  38. heena
    • 2 years ago
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    1/9 i meantion it too

  39. Shayaan_Mustafa
    • 2 years ago
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    1/9 is equals to 0.1. so it is right. may be.

  40. heena
    • 2 years ago
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    yes u r rit u got it congo.........

  41. Shayaan_Mustafa
    • 2 years ago
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    congo?

  42. heena
    • 2 years ago
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    but in ur equation asinwt here t is time not time period

  43. JamesJ
    • 2 years ago
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    Heena. Let's try this one last time. Write out the complete question in your best English.

  44. heena
    • 2 years ago
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    lolz.. ok

  45. hosein
    • 2 years ago
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    ithink shayan answer is wrong.

  46. heena
    • 2 years ago
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    when an osicllator completes 100 oscilation then its amplitude reduced to 1/3 of its initial value of amplitude.what will be its amplitude if an osicllator completes 200 oscilation

  47. JamesJ
    • 2 years ago
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    This question is still very ambiguous. It means either * The time periods for the 100 and 200 oscillations are different and just a distraction. The amplitude is 3rd of what it is and that's the end of it. * We're talking about a pendulum and the period of oscillation changes. In which case we need to use the formula I wrote above * Something else.

  48. Shayaan_Mustafa
    • 2 years ago
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    i know. when i said it is true. it may be wrong. i just tried. although i am an electronics engineer not a theoritical physicist.

  49. heena
    • 2 years ago
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    guys had a idea leave it even i already wasted 30 mins in this ques better to leave this i ll ask my lecturer dont worry

  50. Shayaan_Mustafa
    • 2 years ago
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    yeah, good idea.

  51. heena
    • 2 years ago
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    thnQ for being here for help .. i always gave good ideas u knw gyan guru :P

  52. hosein
    • 2 years ago
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    why gave me medal i can't solve your ques

  53. Shayaan_Mustafa
    • 2 years ago
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    well i am going. good luck every one. take care.

  54. heena
    • 2 years ago
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    hey medal is not for only those who solve the ques but its for those too who atleast tries to solve it ok

  55. heena
    • 2 years ago
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    and i think u deserve as u given ur precious time to had a luk a my ques and tries it to solve as a help thnk you so much

  56. hosein
    • 2 years ago
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    this medal have not a value,i think however thanks for your attention sorry my english not well

  57. heena
    • 2 years ago
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    np i apreciate everyones work they did for helping others dats the main moto to give medals atleast people help others for medals.. and dnt think u dont solve dis medal is for ur work out in this ques ok..

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