terça-feira, abril 22, 2014

Tatuagem "A força necessária ..."

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Esta tatuagem é de uma equação que representa algo do tipo:

A força necessária para empurrar uma bicicleta e seu ciclista através do ar e para superar o atrito da tracção.

Fonte: http://blogs.discovermagazine.com


Eis a explicação :)

(...)
There is a well-known equation that gives the power required to push a bike and rider through the air and to overcome the friction of the drive train:
P = g m V_g (K_1+s) + K_2 V_a^2 V_g,
where P is in watts, g is Earth's gravity, V_g is ground speed (m/s), m is bike/rider mass in kg, s is the grade (m/m), and V_a is the rider's speed through the air (m/s). K_1 is a lumped constant for all frictional losses (tires, bearings, chain), and is generally reported with a value of 0.0053. K_2 is a lumped constant for aerodynamic drag and is generally reported with a value of 0.185 kg/m.[17] If there is no wind, V_g=V_a and the result simplifies to:
P = g m V_g (K_1+s) + K_2 V_g^3,
which is proportional to the ground speed cubed in its leading term.
(...)
Fonte: http://en.wikipedia.org/wiki/Bicycle_performance

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