TSny's latest activity
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TSny reacted to Russ Edmonds's post in the thread Undergrad Simulated motion of an oblate and prolate spinning spheroid with
Love.
Equations of motion for a spinning spheroid [1] where implemented in a Blender Python script. 1. H. K. Moffatt, Y. Shimomura and M... -
TSny replied to the thread Newton's laws homework: inclined plane with pulley.Yes, good. That's what I get. If @akapm90 is OK with this argument, then they can proceed onward and ignore post #5. Very good point...
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TSny replied to the thread Newton's laws homework: inclined plane with pulley.@Steve4Physics: Your post made me think of an easier way to see how ##a_y## is related to ##A_x## and ##A_y##. Imagine that the block...
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TSny replied to the thread Newton's laws homework: inclined plane with pulley.I'm not seeing this. If ##\alpha = 0##, so the upper section of the string remains horizontal, then ##a_y = -A_x##. But this is not...
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TSny replied to the thread Newton's laws homework: inclined plane with pulley.Even though it starts at rest, we can still consider the configuration after the block has moved some distance. Of course, the block...
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TSny replied to the thread Newton's laws homework: inclined plane with pulley.The pulley moves with the block ##M##. If the block moves a distance ##S## up the slope, then the pulley moves parallel to the slope...
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TSny replied to the thread Newton's laws homework: inclined plane with pulley.OK. I see now that you already brought up this ambiguity in your first post. Thanks.
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TSny replied to the thread Newton's laws homework: inclined plane with pulley.I'm wondering if the question is asking for the acceleration ##a## and tension ##T## as functions of time, or if it is asking only for...
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This is only part of the picture. First, in order to apply length contraction to the Earth-star distance, as you are doing, we have to...
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TSny reacted to flyusx's post in the thread Calculating Dipole Moment In 3s To 2p Hydrogen Transition with
Like.
I see that I did make a typo, for which I listed the radial integral as having the value of its square. I've reworked it from scratch... -
TSny replied to the thread Calculating Dipole Moment In 3s To 2p Hydrogen Transition.I think this might be part of the problem: In calculating the transition rate, you should include a sum over the final polarization...
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TSny replied to the thread Calculating Dipole Moment In 3s To 2p Hydrogen Transition.Sounds right to me.
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BTW thanks for the link to Wolfram - I tried it with numbers of four significant figures and it worked.
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TSny replied to the thread Some work on MTW Figure 25.7.I think 1.86 is good. Using simple numerical differentiation, similar to your approach, I get 1.83. The approximate formula ##\frac...
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TSny replied to the thread Undergrad Why is the Lorentz Force always perpendicular to velocity?.Consdider the case where the test charge moves perpendicularly away from the conductor ("wire") in the lab frame ##S## and suppose the...
