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3 years ago

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Please help !!

1 answer:

nikitadnepr [17]3 years ago

3 0

If the speed is constant, the acceleration a must be zero. Since force F = m•a, the total force must be zero.
In a 1D case, work W is the product of force F and distance d: W = F • d.
Since there is no more information given about friction or air resistance, I have to assume you are looking for the work done by the total force, wich is also zero.

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The Achilles tendon connects the muscles in your calf to the back of your foot. When you are sprinting, your Achilles ten-don al

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$Y=\frac{Fl}{A\Delta l}$

Replacing the value of the force in the equation of young's modulis we have,

$Y = \frac{8mg*l}{A\Delta l}$

Re-arrange the equation for the rate of l, we have,

$\Delta l = \frac{8mgl}{AY}$

Our values here are giving by,

$m=70kg$

$g=9.8m/s^2$

$l=15*10^{-2}m$

$A=110*10^6m^2$

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Replacing in the previous equation we have that,

$\Delta l = \frac{8(70)(9.8)(15*10^{-2})}{110*10^6*1.5*{10}}$

$\Delta l = 4.98*10^{-3}m$

We note that Achilles tendon stretch around 5mm

<em>B) The strain is given by the equation,</em>

$\epsilon = \frac{\Delta l}{l}$

The fraction of the tendon's lenght is the ratio of the change in lenght to the streched lenght, that is

$\alpha = \frac{\Delta l}{l}$

$\alpha = \frac{5*10^{-3}}{15*10^{-2}}$

$\alpha = 0.033$

The fraction of the tendon's lenght is 0.0333

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