Question

The driving wheel of a locomotive engine is $2.1m$ radius. Find the distance covered when it has made $8000$ revolution

Answer 1

Given radius, $r=2.1m$

Circumference of the wheel $=2\pi r$

$=2\times \frac{22}{7}\times \left(2.1\right)$

$=13.2m$

Hence distance covered for $1$ revolution $=$ circumference of the wheel $=13.2m$

Therefore distance covered for $8000$ revolutions

$=13.2\times 8000=105600m=105.6km$ $[\because 1km=1000m]$