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haruspex's latest activity
haruspex
replied to the thread
Damped harmonic oscillation
.
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...
Today, 4:26 PM
haruspex
replied to the thread
Shortest distance along the shore and into the lake
.
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...
Today, 4:18 PM
haruspex
replied to the thread
Shortest distance along the shore and into the lake
.
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...
Today, 1:03 AM
haruspex
replied to the thread
Damped harmonic oscillation
.
##x_1\hat e_1, x_2\hat e_2## are vectors, no allegation required. But please clarify the concern you have.
Yesterday, 10:29 PM
haruspex
replied to the thread
Damped harmonic oscillation
.
I repeat, my point is that the usage is not as standard as claimed in post #39. Perfectly respectable sources express conflicting views.
Yesterday, 8:41 PM
haruspex
replied to the thread
Damped harmonic oscillation
.
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...
Yesterday, 6:10 PM
haruspex
replied to the thread
Damped harmonic oscillation
.
I see no problem. All we are discussing is terminology. If ##\vec v=x_1\hat e_1+x_2\hat e_2## should we call ##x_1\hat e_1, x_2\hat...
Yesterday, 5:53 PM
haruspex
replied to the thread
Damped harmonic oscillation
.
That does not appear to be completely standard. It certainly seems a more reasonable use of the word "component" to say that a vector...
Yesterday, 4:16 PM
haruspex
replied to the thread
Damped harmonic oscillation
.
No, just emphasising that, being a scalar, it can be positive or negative. Why do you suppose it is a vector? The equation here is for...
Yesterday, 6:53 AM
haruspex
replied to the thread
Damped harmonic oscillation
.
Seems to me your whole confusion comes from taking v to be a magnitude whereas in the equation you quote in post #1 it is a signed scalar.
Yesterday, 6:12 AM
haruspex
replied to the thread
Damped harmonic oscillation
.
Presumably, in ##bv\hat i##, v stands for the magnitude of the velocity. If so, ##b\vec v=-bv\hat i##.
Yesterday, 4:15 AM
haruspex
replied to the thread
Damped harmonic oscillation
.
How so? In that situation, v is negative and the damping force acts to the right, so it is -bv.
Yesterday, 2:22 AM
haruspex
replied to the thread
X and Y coordinates of an oscillating object on a spring.
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except that, as indicated later, the amplitude and phase constants can be different. Only the frequency must be the same. Easily...
Thursday, 5:17 AM
haruspex
replied to the thread
The electric potential inside a conducting sphere with charge Q
.
Right, like an infinite uniformly charged sheet.
Thursday, 2:05 AM
haruspex
replied to the thread
The electric potential inside a conducting sphere with charge Q
.
As noted in posts #5 and #6, it does not follow that the potential inside is nonzero. It will be nonzero if (a) we adopt the common, but...
Wednesday, 9:40 PM
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