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Homework Help: Help Stuck on these 2 problems

  1. Mar 16, 2005 #1
    Help!!! Stuck on these 2 problems

    1. Determine the motions equations of an ideal pendulum of mass m and lengh r.

    2. A machine is formed by a homogenous cylinder of radio R and mass M. It rotates in its axel (frictionless). A mass by an inextensible cord (massless) is roller to cylinder. Find the motions equations.
  2. jcsd
  3. Mar 16, 2005 #2

    Andrew Mason

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    Homework Helper

    This is fully explained in many texts. All you need to work out is the tangential restoring force on the pendulum mass:

    [tex]F_{tang} = ma_{tang}[/tex] = tangential component of mg.

    I am not sure I understand the problem here. Is the mass on a horizontal frictionless surface begin rolled toward the cylinder or is it rotating about the cylinder?

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