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Posted by on Wednesday, June 29, 2011 at 6:21pm.

What is the angular momentum of the second hand on a clock if the clock has a length of 25cm, a mass of 20g, and is rotating with constant angular velocity. Treat the second hand as a thin rod.

  • Physics - , Wednesday, June 29, 2011 at 6:29pm

    I w
    where I is moment of inertia
    and
    w is radians/second = 2 pi/period
    period = 1 minute = 60 seconds

    I = (1/3) M L^2 = (1/3)(.020 Kg)(.25 m)^2
    = 4.17*10^-4
    4.17 *10^-4 * 2 * pi / 60 = 4.36 * 10^-5

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