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haruspex's latest activity
haruspex
replied to the thread
How to understand the direction of tension in a charged closed ring?
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If you consider a short element of a very thin ring, tension is the force each such element exerts on its neighbours. The two ends of...
Yesterday, 11:36 PM
haruspex
replied to the thread
Planet moving in elliptical orbit around a star
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No, ##v_B\sin(\beta)=\omega r_B##, etc. No, it is the rate of increase of the rate of increase of the radius. In a circular orbit it...
Yesterday, 7:53 PM
haruspex
replied to the thread
Is This a Series or Parallel Circuit?
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Coulombs/sec?
Yesterday, 7:44 PM
haruspex
replied to the thread
Is This a Series or Parallel Circuit?
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No, because the conductive capacity of ##R_3## is shared in some way between those two loops. Given the symmetry, it is shared equally...
Yesterday, 4:41 PM
haruspex
replied to the thread
Planet moving in elliptical orbit around a star
.
If you mean Kepler III, the radius in that law refers to the semi-major axis. It is a law relating all planets orbiting the same star...
Yesterday, 4:04 PM
haruspex
replied to the thread
Planet moving in elliptical orbit around a star
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Sorry, I should have been clearer. A radial component other than centripetal acceleration, i.e. ## \ddot r##
Yesterday, 3:53 PM
haruspex
replied to the thread
Planet moving in elliptical orbit around a star
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I don't think you can use that formula in an elliptical orbit. There can be a radial component to the acceleration. What do you know is...
Yesterday, 6:28 AM
haruspex
replied to the thread
Range of an object launched on a downward hill
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Let me try to be clearer. I am saying that since the velocity only bisects that angle when the range is maximised, a proof that it is...
Yesterday, 6:01 AM
haruspex
replied to the thread
Range of an object launched on a downward hill
.
Clearly that is not true in general (consider firing it straight upwards). It is true if the range is maximised, but I see no attempt...
Yesterday, 12:37 AM
haruspex
replied to the thread
Damped harmonic oscillation
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I cannot see what that has to do with my post #44. The question I raised there was merely one of terminology: having resolved a vector...
Saturday, 4:26 PM
haruspex
replied to the thread
Shortest distance along the shore and into the lake
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Neat, but it would still have led to an answer that the place to jump in is to the left of A. I would guess @brotherbobby would have...
Saturday, 4:18 PM
haruspex
replied to the thread
Shortest distance along the shore and into the lake
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The thing to check is whether your first equation represents reality in all cases. For x<0 it doesn't: it gives a negative time for...
Saturday, 1:03 AM
haruspex
replied to the thread
Damped harmonic oscillation
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##x_1\hat e_1, x_2\hat e_2## are vectors, no allegation required. But please clarify the concern you have.
Friday, 10:29 PM
haruspex
replied to the thread
Damped harmonic oscillation
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I repeat, my point is that the usage is not as standard as claimed in post #39. Perfectly respectable sources express conflicting views.
Friday, 8:41 PM
haruspex
replied to the thread
Damped harmonic oscillation
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We all, naturally, teach as we were taught (or as we understood at the time, which is not always the same). But as the links I posted...
Friday, 6:10 PM
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