Summit signs

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paul0
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Re: Summit signs

Post by paul0 »

TravelingMatt wrote:...at least 13,770 feet MSL.

To five significant figures, which is what our mountains are measured to,
I believe this is four significant figures.


TravelingMatt wrote:...The equation for angle of deflection of light due to gravity is theta = [4GM]/[r(c^2)]. For the earth in SI units, the exponent of G is -11, M is 24, r is 6 and c^2 is 16, making the exponent of theta -9 give or take. That is, billionths of radians, which you'd be taking the cosine of anyway to get the factor.
This is an especially inapt formula to use in the quoted situation since the impact parameter (b classically or r in the quote) is an orthogonal distance from the path of the particle to the field potentially affecting it. Which, of course, would be zero in the quoted situation.


TravelingMatt wrote:IOW, shut up
This ad hominem attack is a logically fallacy and is consistent with the factual errors within the quotes.
--
"There's nothing so stable as change."
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TravelingMatt
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Re: Summit signs

Post by TravelingMatt »

paul0 wrote:I believe this is four significant figures.
If you had bothered to do the math yourself, you'd find the final zero is significant.

This is an especially inapt formula to use in the quoted situation since the impact parameter (b classically or r in the quote) is an orthogonal distance from the path of the particle to the field potentially affecting it. Which, of course, would be zero in the quoted situation.
So you're saying there's no lensing at all (or there's less lensing than the billionths of radians I estimated), which is to say I am right that accounting for it is unnecessary?

There's still a lensing effect when the vector is directly away from the center of gravity, but it would be less than 4GM/rc^2, for reasons that as textbooks like to say will be left as an exercise to the reader.

This ad hominem attack is a logically fallacy and is consistent with the factual errors within the quotes.
It's not a logical fallacy, I made no factual errors, you didn't attack my actual use of math or provide a counterargument that it is necessary to compensate for lensing, and your grammar sucks.
You never know what is enough until you know what is more than enough. -- William Blake
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LURE
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Re: Summit signs

Post by LURE »

George James wrote:
LURE wrote:Could I borrow one of your laminated 14er signs, please?
Absolutely not. Can't break up the set. Get your own
Maybe if I try it I'll understand why everybody does it.
You really should try it if you rrreally haven't done it. I don't believe you haven't done it. Who of us has not stood on top of one of these and posed with some sort of sign? Suspicious.

Srsly tho go try it if you haven't. It just plain American fun, and you'll never be bored if you try something new. Really, there's no telling to what you can do!

PS - you get free sandwich out of it still right? why wouldnt you do it amiright
Sharing is caring!

But yeah, you got me. I once did the Which Wich thing, a good while back. Never even picked up my sandwich.
stevo6868
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Re: Summit signs

Post by stevo6868 »

Kind of ironic... I did a quick trip to Sherman today and there was two summit signs left up there, one correct, one incorrect, and a summit rock scribed with sharpie. I found great humor in all of it due to this thread :-D