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physics/math

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A puck of mass m = 1.10 kg slides in a circle of radius r = 16.9 cm on a frictionless table while attached to a hanging cylinder of mass M = 2.20 kg by means of a cord that extends through a hole in the table. What speed keeps the cylinder at rest?

  • physics/math -

    Ac = v^2/r

    1.1 Ac = 2.2 g
    so
    Ac = (2.2/1.1)(9.81) = 19.6 m/s^2

    v^2 = .169 (19.6) = 3.32
    v = 1.82 meters/second
    that is the speed
    if you want angular velocity
    omega = v/r = 1.82 /.169 = 10.8 radians/second

  • physics/math -

    thanks so much!!!!!

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