[tex]\nu =20 \dfrac{rot}{min}= 20\dfrac{rot}{60 s}= \dfrac{1}{3} \dfrac{rot}{s}=0.33 \dfrac{rot}{s}\\
R=50\ cm=0.5\ m\\
...................................\\
\text{Din echilibrul fortelor avem ca:}\\
F_f=F_{cf}\\
\mu \cdot N=m\cdot \dfrac{v^2}{R}\\
\mu \cdot m\cdot g=m\cdot \dfrac{4\pi^2\nu^2\cdot R^2}{R}\\
\mu\cdot g= 4\pi^2\nu^2\cdot R\\
\mu =\dfrac{4\cdot \pi^2 \cdot \nu^2\cdot R}{g}\\
\text{Mai departe il calculezi tu}.[/tex]
