The number of revolutions made by a circular wheel of radius 0.25 m in rolling a distance of 11 km i

Question

The number of revolutions made by a circular wheel of radius 0.25 m in rolling a distance of 11 km is\

Professor PC Thomas Classes · Answer

(d): In one revolution wheel covers distance of $2 \pi r$. So, in $n$ revolution it will cover $2 \pi r n$ distance.\ $	herefore \quad S=2 \pi r n$\ According to question, $S=11 \mathrm{~km}, r=0.25 \mathrm{~m}$ so,\
$$\begin{equation}
11 	imes 1000 = n 	imes 2 	imes \frac{22}{7} 	imes 0.25 \Rightarrow n = 7000
\end{equation}$$