Question

A wheel has diameter 24 cm. Find how many complete revolutions must it take to cover 3.168 km.

Answer 1

$r=\frac{d}{2}=\frac{24}{2}=12cm=0.12m$

Let the no of revolution be $n$

Total distance covered$=3.168km=3168m=2n\pi r⟹n=\frac{3168}{2\pi \times 12}=4203$