Recent content by chi-young

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    Easy way to get the expectation value of momentum squared?

    Hello, I've been trying to define <p2> in terms of <x2>, much the same way that you can write <p> = m d<x>/dt, because it would be easier in my calculations. Is this possible, or am I on a fools errand? Edit: For Gaussian distributions.
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    How does angular momentum create a perpendicular force?

    The experiment of a quickly rolling wheel on a string is well known. How is this behavior explained in terms of the molecules of an atom? That is to say, why don't the individual atoms of the wheel fall down?
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    Checking the divergence of a function

    Homework Statement Check the divergence theorem using the vector function V = r^2 \hat{r} + sin(θ) \hat{θ} which is expressed in spherical coordinates. For the volume use a hemisphere of unit radius above the xy-plane (see figure below) (picture not shown, but I integrated r: 0 to 1, theta: 0...
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    Good careers in Computational Physics?

    I'm trying to go into big data and I like physics so I'm going for a degree in computational physics. I'm thinking of learning Hadoop and Storm, because all of the corporate careers seem to require them. Am I barking up the right tree? What kind of career path will a Bachelor's in Computational...
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    Why isn't passive dynamic walking used more?

    ouch. Okay. Why are there not more quasi passive dynamic lower extremity active orthosis' or exoskeletons in comparison to fully actuated versions? What is holding passive dynamic exoskeleton design back?
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    Why isn't passive dynamic walking used more?

    I was researching movement models for bidpedal locomotion and when I stumbled across this amazing video of passive dynamic walking from 1990. But all the papers now I find are about neural oscillation. I do not find a mention of passive dynamic walking anywhere. Was there some kind of fatal flaw...
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    How Does Zero Moment Point Influence Robot Stability?

    So I was reading up "Zero Moment Point -Thirty Five Years of Its Life" by Vukobratic for a presentation, and is said something like this: So if I am reading this right, it's saying the point where the GRF is acting upon will shift based on the magnitude of the force created by the...
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