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    Moment of Inertia Problems

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    The three problems attached having to do with moment of inertia of things like a yo-yo.

    I need help setting them up. Please send explanations with the answer so I can see how your answer was achieved.

    © BrainMass Inc. brainmass.com October 9, 2019, 4:39 pm ad1c9bdddf
    https://brainmass.com/engineering/mechanical-engineering/moment-of-inertia-problems-38018

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    1)
    Let us assume the tension in the string be T, acceleration be a, angular acceleration be alpha, and time taken be t.
    r = 5 in = 5/12 ft
    R = 10 in = 10/12 ft
    moment of inertia I = 0.24 slug.ft^2 = 0.24*32.2 lb.ft^2
    mass m = 50 lb
    gravitational acceleration g = 32.2 ft/s^2

    Net force
    m*g - T = m*a .........(1)

    Moment about the center,
    T*r = I*alpha = I*a/r
    => T = I*a/r^2 .........(2)

    From Equations. (1) and (2),
    m*g = (m + I/r^2)*a
    => a = m*g/(m + I/r^2)

    Kinematics: s = 4 ft; u = 0 (rest)

    Because,
    s = u*t + (1/2)*a*t^2
    => s = (1/2)*t^2*m*g/(m + I/r^2)
    => t^2 = 2*s*(m + I/r^2)/(m*g)
    => t^2 = 2*4*(50 + ...

    Solution Summary

    The solution provides comprehensive workings-out of the three moment of inertia problems given, including step-by-step break-downs of the necessary calculations and snippets of written explanation where needed.

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