A runner makes one rap round 200m track in a time 25s,what is the average speed and velocity

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Ответ:

bartfrank447

06.03.2020

Physics

$i = 7.438\,A$

Explanation:

Current can be determined by Ohm's Law, whose expression is:

$i = \frac{V}{R}$

Where is the electrical resistance, whose formula is described below:

$R = \frac{\rho\cdot L}{A_{t}}$

Where $\rho$ , and $A_{t}$ are the electrical resistivity and wire length and cross area, respectively. The electrical resistivity for tungsten is $5.65\times 10^{-8}\,\Omega \cdot m$ . Finally, the electrical resistance is computed herein:

$R =\frac{(5.65\times 10^{-8}\,\Omega\cdot m)\cdot (1.50\,m)}{0.7\times 10^{-6}\,m^{2}}$

$R = 0.121\,\Omega$

Moreover, the current in the wire is:

$i = \frac{0.9\,V}{0.121\,\Omega}$

$i = 7.438\,A$

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