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anonymous

  • 5 years ago

The displacement d (in meters) of an object at time t (in seconds) is given. d= -sin(t/9) (a) Describe the motion of the object. is it simple harmonic motion or damped motion? (b) What is the maximum displacement from its resting position? Round your answer to two decimal places. in meters (c) What is the time required for one oscillation? Round your answer to two decimal places. in seconds (d) What is the frequency? Round your answer to two decimal places. in oscillation/second

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  1. amistre64
    • 5 years ago
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    simple harmonic i believe; there is no part of it that is accounting for a dampned effect

  2. anonymous
    • 5 years ago
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    1 is the max displacement

  3. amistre64
    • 5 years ago
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    the displacement from rest is the amplitude; which is 1 the initial displacement tho is -1

  4. anonymous
    • 5 years ago
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    it asks for decimal places tho?

  5. anonymous
    • 5 years ago
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    initial disp is 0 amistre

  6. amistre64
    • 5 years ago
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    1.0000 then lol

  7. anonymous
    • 5 years ago
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    hahaha

  8. anonymous
    • 5 years ago
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    hahaha

  9. amistre64
    • 5 years ago
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    well.... yeah, initial = 0 :)

  10. anonymous
    • 5 years ago
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    1/18pi is the frequency

  11. anonymous
    • 5 years ago
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    and hence18pi is the time period for one oscillation

  12. anonymous
    • 5 years ago
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    so max disp is 0 or 1?

  13. amistre64
    • 5 years ago
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    1

  14. amistre64
    • 5 years ago
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    are you accounting for the pi already in the problem? or are you atributing an external pi?

  15. amistre64
    • 5 years ago
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    sin[(1/9)t]

  16. anonymous
    • 5 years ago
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    see the eqn for shm is x=sin (wt)

  17. anonymous
    • 5 years ago
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    and 2(pi)f=w

  18. anonymous
    • 5 years ago
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    lol i got lost

  19. anonymous
    • 5 years ago
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    so f=w/2pi

  20. anonymous
    • 5 years ago
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    w=1/9 hence f = 1/18pi

  21. amistre64
    • 5 years ago
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    i get turned around whe w = pi/n lol

  22. anonymous
    • 5 years ago
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    and since T=1/f , T=18pi

  23. amistre64
    • 5 years ago
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    http://www.wolframalpha.com/input/?i=-sin%28t%2F9%29 hims good on it

  24. anonymous
    • 5 years ago
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    yeah waves were my forte ;)

  25. anonymous
    • 5 years ago
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    so was c) 18pi ?

  26. anonymous
    • 5 years ago
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    yes

  27. anonymous
    • 5 years ago
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    did u follow the working?

  28. anonymous
    • 5 years ago
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    lol got lost

  29. anonymous
    • 5 years ago
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    would you mind explaining it to me?

  30. anonymous
    • 5 years ago
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    do u know what simple harmonic motion is?

  31. anonymous
    • 5 years ago
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    i did it before but forgot. is it got to do with the pendulums?

  32. anonymous
    • 5 years ago
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    yeah...anything in shm follows the displacement eqn x = Asin(wt) w is called the angular frequency and equals 2pi x f where f is the frequency

  33. anonymous
    • 5 years ago
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    and f=1/T where T is the time for one cycle or oscillation

  34. anonymous
    • 5 years ago
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    i remember now haha

  35. anonymous
    • 5 years ago
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    max disp from its resting position isnt 1 tho

  36. anonymous
    • 5 years ago
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    then what?

  37. anonymous
    • 5 years ago
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    -1?

  38. anonymous
    • 5 years ago
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    im not sure. but the answer u got is 1.00? its not right for some reason

  39. anonymous
    • 5 years ago
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    so its -1?

  40. anonymous
    • 5 years ago
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    is it -1.00??

  41. anonymous
    • 5 years ago
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    must be that then...

  42. anonymous
    • 5 years ago
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    no it isn't.

  43. anonymous
    • 5 years ago
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    it must be to two dp and be in meters

  44. anonymous
    • 5 years ago
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    gotta be 1.00...dunno y its coming out wrong..

  45. anonymous
    • 5 years ago
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    me either but it aint working. tried it already

  46. anonymous
    • 5 years ago
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    cud it be 0

  47. anonymous
    • 5 years ago
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    how do u work that part anyways?

  48. anonymous
    • 5 years ago
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    hey amistre, the max disp from rest is turnin out wrong

  49. anonymous
    • 5 years ago
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    i put in -1.00 and 1.00 both r wrong

  50. amistre64
    • 5 years ago
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    thats becasue we assumed displacement = amplitude d = displacement; so we gotta work the formula :)

  51. anonymous
    • 5 years ago
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    amplitude is defined as the max displacemnt from the mean position

  52. amistre64
    • 5 years ago
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    it peaks at |+-1| it aint asking for the value of 't' at the max becasue there aint no interval to associate a single t into

  53. amistre64
    • 5 years ago
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    have you tried it without the decimals?

  54. amistre64
    • 5 years ago
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    just enter: 1

  55. anonymous
    • 5 years ago
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    its my last shot tho lol

  56. anonymous
    • 5 years ago
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    nah, it didnt work

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