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    Loaded Sullivan's Perfect Ratchet

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    Show that in the case of zero external force the equation v=(fL/kT)^2 D/L (e^(fL/kT) - 1 - fL/kT)^-1 reduces to 2D/L. Then show that at high force (but still smaller than (epsilon/L)) the equation reduces to v=(fL/kT)^2 D/L (e^(-fL/kT)).

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    https://brainmass.com/physics/classical-mechanics/loaded-sullivans-perfect-ratchet-29131

    Solution Preview

    Part 1:
    v=(fL/kT)^2 D/L (e^(fL/kT) - 1 - fL/kT)^-1
    => v = (fL/kT)^2 (D/L)/ (e^(fL/kT) - 1 - fL/kT)
    => v = (fL/kT)^2 (D/L)/ (1 + (fL/kT) + (fL/kT)^2/2! + ... - 1 - ...

    Solution Summary

    This solution includes multiple calculations proving the equation reduces. The loaded Sullivan's perfect ratchet is analyzed.

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