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Homework Help: A problem about a moving nickel coin - help/advice

  1. Nov 14, 2008 #1
    Please, help me with this:

    1. The problem statement, all variables and given/known data
    A nickel coin with diameter 2 cm and thickness 2 mm starts to roll with no friction on a horizontal plane with spped 10 cm/s. At 55.2 cm from the beginning the plane is inclined up. For the coin to go up to height max= 0.5 mm, what should be the maximum angle of inclination ? The rotation frequency is 1/2pi (s^-1), and the friction force down the inclined region is constand with f = 7.5 mikro Newtons.

    also, the nickle density is 8.9 g/cubic cm

    2. Relevant equations

    conservation of energy, newton's laws, laws of mechanical motion

    3. The attempt at a solution

    I receive an angle of ~40 degree, but I think something's wrong. Thanks for the advice!
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Nov 14, 2008 #2


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    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi archivlad! Welcome to PF! :smile:

    (have a mu: µ and a pi: π :wink:)
    Yup … conservation of energy is the way to go!

    Show us what you tried, and where you're stuck, and then we'll know how to help. :smile:
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