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MarcLeclair

  • 3 years ago

A 240g particle oscillating in SHM travels 31cm between the two extreme points in its motion with an average speed of 90cm/s. b) The maximum force on the particle. Can't figure that one out :/

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  1. Natan
    • 3 years ago
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    (b) In this case the force is equal to F=-kx, |F|=kx. If k =const. the maximum force is when x is maximum.

  2. BoneFreeze
    • 3 years ago
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    Natan is right k=mg/h and since Fmax = kh = mg/h *h = mg =0.24*Acceleration due gravite (9.8 m/s2 or something like that)

  3. Natan
    • 3 years ago
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    yes. that is right. please can you tell me about the letter a .

  4. MarcLeclair
    • 3 years ago
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    That doesnt work though I tried, in letter A i got the answer right I did t=1/f therefore t=2pi/w which is in turn w=9.26. Knowing the mass is .240 kg you can find out k being 20.56 no? and I get fmax = 15.5cm * 25.56 (15.5cm being the Xm)

  5. Natan
    • 3 years ago
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    that is fmax=20.56*15.5. what is the question in letter a?

  6. MarcLeclair
    • 3 years ago
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    oh my bad Its this : The angular frequency.

  7. MarcLeclair
    • 3 years ago
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    find the angular frequence* which i found with the t=1/f

  8. Natan
    • 3 years ago
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    Sorry i'm confused now.

  9. MarcLeclair
    • 3 years ago
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    In a i have to find the angular frequency, the w of the following equation x=Asin(wt+ alpha) alpha being the phase constant.

  10. MarcLeclair
    • 3 years ago
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    I found my W using the fact that frequency is T ( period) = 1/f and therefore T=2pi/w

  11. Natan
    • 3 years ago
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    it is OK. Now I urderstood. k=w^2*m

  12. Natan
    • 3 years ago
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    in letter b you got the correct answer

  13. MarcLeclair
    • 3 years ago
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    yeah so k = 9.26^2 * .240g which gives me 20.56 but it always gives it wrong to me :/ could it be the sign?

  14. MarcLeclair
    • 3 years ago
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    so f=kx therefore my amplitude is 31/2 so f = 20.56 *.240 no?

  15. Natan
    • 3 years ago
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    no f=15.5*20.56

  16. MarcLeclair
    • 3 years ago
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    yeah sorry and it g ives 319 but it says its wrong, I don't know what to do to change it

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