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heena

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

  • 2 years ago
  • 2 years ago

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  1. JamesJ
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    100 oscillations in what time period?

    • 2 years ago
  2. heena
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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

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

    • 2 years ago
  4. JamesJ
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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.

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

    • 2 years ago
  6. JamesJ
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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.

    • 2 years ago
  7. heena
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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?

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

    • 2 years ago
  9. heena
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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

    • 2 years ago
  10. hosein
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    i think amplitude decrease

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

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

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

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

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

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

    • 2 years ago
  17. JamesJ
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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.

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

    • 2 years ago
  19. heena
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    yea solve diss ques

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

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

    • 2 years ago
  22. heena
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    plz quick

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

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

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

    • 2 years ago
  26. Shayaan_Mustafa
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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

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

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

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

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

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

    • 2 years ago
  32. heena
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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..

    • 2 years ago
  33. Shayaan_Mustafa
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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?

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

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

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

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

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

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

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

    • 2 years ago
  41. Shayaan_Mustafa
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    congo?

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

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

    • 2 years ago
  44. heena
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    lolz.. ok

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

    • 2 years ago
  46. heena
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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

    • 2 years ago
  47. JamesJ
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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.

    • 2 years ago
  48. Shayaan_Mustafa
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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.

    • 2 years ago
  49. heena
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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

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

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

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

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

    • 2 years ago
  54. heena
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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

    • 2 years ago
  55. heena
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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

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

    • 2 years ago
  57. heena
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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..

    • 2 years ago
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