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Help anyone know how to do this type of problem

  1. Sep 28, 2005 #1
    A boy of mass 41 kg rides on a playground merry-go-round at a speed of 2.0 m/s. and has to hold on with a force of 79 N to keep from flying off. What is the radius of the merry-go-round?
     
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  3. Sep 28, 2005 #2

    arildno

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    Ask yourself the following:
    What type of acceleration does the boy experience?
     
  4. Sep 28, 2005 #3

    Tide

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    Yes, a lot of people know how to do that type of problem. The real question is what have you tried so far? :)
     
  5. Sep 28, 2005 #4
    F=M1*M2/R but i dono if thats right
     
  6. Sep 28, 2005 #5

    arildno

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    Do you know what your symbols mean?
     
  7. Sep 28, 2005 #6
    Yes, but it seems as if there is only one mass the mass of the boy i didnt know wher the second mass would come from thats why it staryed me away from this equation but i wasnt sure what else i coudl use
     
  8. Sep 28, 2005 #7

    arildno

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    So you just pick some formula out of thin air and hope you can apply it to a given situation??

    What is acceleration, what dimensions does it have?
     
  9. Sep 28, 2005 #8
    its centripital acceleration
     
  10. Sep 28, 2005 #9

    arildno

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    Correct. What are the physical dimensions of acceleration?
    Do you see those anywhere in your formula?
     
  11. Sep 28, 2005 #10
    F=mv^2/r possibly
     
  12. Sep 28, 2005 #11

    arildno

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    That is correct.
    Now, what is the unkown quantity in that equation?
     
  13. Sep 28, 2005 #12
    radius so would it be .481
     
  14. Sep 28, 2005 #13
    A airplane flies in a circle of radius 1.0 km at a constant speed of 1248 m/s. What is the centripetal acceleration of the airplane in km/s/s?
    would the centripital accel be = (to v^2/r) or (1248^2)/1 which would be 1557504 km/s/s
     
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