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José Gonçalves's List: Physics
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Feb 16, 09
Clima: Emissões de carbono estão a aumentar a um ritmo superior ao esperado. A preocupação aumenta relativamente às mudanças de clima e condições atmosféricas.
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Sep 10, 08
News about Large Hadron Collider
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Jul 09, 10
The most accurate measurement ever suggests the proton is smaller than we thought, which could hint at exotic new particle physics
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Jul 24, 11
@eufisica Another Solar Negative http://t.co/D07BZZP Hopefully like you!
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http://www.thecompasscompany.com/noname10.html
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http://www.ocean.washington.edu/people/grads/mpruis/ magnetics/history/hist.html
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Aug 29, 11
Let’s estimate he can push down with a force about a quarter of his weight. If he weighs 200 pounds, this would result in a force of 50 pounds, or 225 N. We also know that the force of friction (F) between his feet and the asphalt depends on the force with which he pushes down (N) and the “coefficient of kinetic friction”(μ) between the soles of his shoes, which we will assume are made of rubber, and the pavement.
F = μN
The μ between rubber and asphalt varies between 0.5 and 0.8. Let’s assume a value of 0.7. Therefore, solving for stopping distance, we get:
D = ½(2100kg)(18m/s)2/(0.7)(225N) = 2160 meters, or over 1.3 miles!
The situation might be improved if he exerted his full 200 pounds, or 900 Newtons, of force against the ground. In that case:
D = 1/2(2100kg)(18m/s)2/(0.7)(900N) = 540 meters (about a third of a mile)
However, the amount of torque exerted on his ankles and knees might make that a problematic proposition.
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