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5 SHM Problems i can't get HELP!

  1. Sep 25, 2012 #1
    5 SHM Problems i can't get :( HELP!

    http://imageshack.us/a/img201/3924/sadv.png [Broken]

    Okay so these are the last 5 problems that I'm stuck on... I've tried a lot and no success, if anyone can please show me the work on how to get them... I've tried all 4 and will explain what I did

    1) I found the mass easily but do not know where to go from here....

    2) This is my work and it was wrong
    0.8kg (m) x 9.8m/s^2 (g) = F
    7.84N = F
    -----------------------------
    F = kx
    7.84N = 20N/m × x
    7.84/20 = x
    0.392 = x

    3) I found A-max using A-max = w^2
    Plugged that into the equation Acceleration = - Aw^2 sin (wt + ∅) to find t.
    Then plugged t into X = Asin(wt+∅) to find it's position... both of which were incorrect

    4) I found the positions successfully.. tried to plug those values into the given equation to
    find time and no luck...

    5) I'm not yet 100% with pendolums so i'll do a little more studying on this one

    --------------------------------------------------------------------------------------
    Any help on these would be greatly appreciated thank you all :)
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Sep 25, 2012 #2

    SammyS

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    Re: 5 SHM Problems i can't get :( HELP!

    Hello gf_24. Welcome to PF !

    Please include at most, two questions/problems per post. (See the rules for this Forum.)
     
  4. Sep 25, 2012 #3

    micromass

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    Re: 5 SHM Problems i can't get :( HELP!

    Let's do questions (1) and (2) in this thread. Please create another thread for the other questions.
     
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