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A question about the earths curve. Rate Topic: -----

#21 23 February 2012 - 07:12 PM DrRocket 


Primate

View PostTonyMcC, on 18 February 2012 - 06:36 PM, said:

To be fair to you, I realise that what I said did not properly describe what I meant!! The end result of what I concluded should make what I meant quite clear. But, of course that isn't really good enough. ( especially for a mathematician?) :(


I strongly doubt that even you know what you meant.

You can know the name of a bird in all the languages of the world, but when you're finished, you'll know absolutely nothing whatever about the bird... -- Richard P. Feynman
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#22 23 February 2012 - 08:09 PM mertol 


Quark
Ofcourse you can climb angles even above 90° but not walking. You can't walk at more than 30°.
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#23 26 February 2012 - 03:21 AM DrRocket 


Primate

View Postmertol, on 23 February 2012 - 08:09 PM, said:

Ofcourse you can climb angles even above 90° but not walking. You can't walk at more than 30°.
Posted Image



Angles? Angles ?

All I see are curves.

You can know the name of a bird in all the languages of the world, but when you're finished, you'll know absolutely nothing whatever about the bird... -- Richard P. Feynman
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#24 26 February 2012 - 06:58 PM John Cuthber 


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Chemistry Expert
Well, according to WIKI's article on friction "Coefficients of friction range from near zero to greater than one – under good conditions, a tire on concrete may have a coefficient of friction of 1.7" and if we assume that your shoes have soles made from the same rubber as the tyre and that the bridge is concrete then the limiting angle is about 69 degrees.
Higher values of the coefficient are not impossible.
What's this signature thingy then? Did you know Santa only brings presents to people who click the + sign? -->
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#25 26 February 2012 - 07:40 PM Schrödinger's hat 


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Psychic Sexpert

View PostJohn Cuthber, on 26 February 2012 - 06:58 PM, said:

Well, according to WIKI's article on friction "Coefficients of friction range from near zero to greater than one – under good conditions, a tire on concrete may have a coefficient of friction of 1.7" and if we assume that your shoes have soles made from the same rubber as the tyre and that the bridge is concrete then the limiting angle is about 69 degrees.
Higher values of the coefficient are not impossible.


Really now? What about the dynamic friction if you slip? What if you start falling and no longer have all your weight on the shoes?
You go for a nice long stroll on a 70 degree roof, and I'll come to see you in hospital if you survive.
I don't believe in free will, but I choose to pretend it exists. If I'm helpful press the green button--->
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#26 27 February 2012 - 10:44 AM mertol 


Quark
Your calculations are wrong with 1.7 you could stay at 59.5°.
And even the best supercars barely reach friction of 1.15 even having aero downforce to help them:
http://www.modernrac...stestcars4.html
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