Question #137917
A cyclist rides along the circumference of a circular horizontal plane of radius R, the friction coefficient being dependent only on distance r from the centre O of the plane as k = k0(1 - r/R), where k0 is a constant. Find the radius of the circle with the centre at the point along which the cyclist can ride with the maximum velocity. What is this velocity?
1
Expert's answer
2020-10-15T03:06:15-0400

Solution

As given in question

The cyclist moves in circular path and centripetal force is given by frictional force so,

f=mωf=m\omega

kmg=mv2rkmg=\frac{mv^2}{r}

k0(1rR)g=v2rk_0(1-\frac{r}{R}) g=\frac{v^2}{r}


v=k0(rr2R)gv=\sqrt{k_0(r-\frac{r^2}{R}) g} . ............. eq. 1

For maximum velocity

dvdr=0\frac{dv}{dr}=0

So we get

r=R2r=\frac{R}{2}

So velocity becomes as


v=k0gR2v=\frac{\sqrt{k_0gR}}{2}



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