Question

The diameter of wheel is 0.70 m. Find the distance covered by it in 500 revolutions.
If the wheel takes 5 minutes to make 500 revolutions;its speed in km/hr is 13.2 km/hr

If true then enter $1$ else 0

Answer 1

Since the diameter of the roller is $0.7m$, its radius is $0.35m$.
In one revolution, the wheel covers the distance of one circumference.
Circumference of the roller of radius $0.35m=2\times \frac{22}{7}\times 0.35=2.2m$
Distance travelled in $500$ revolutions $=500\times 2.2m=1100m$

Speed $=\frac{Distance}{Time}=\frac{1100m}{5minutes}=\frac{1100m}{5\times 60seconds}=3\frac{2}{3}$ m/s

m/s can be converted to km/hr using the formula m/s $\times 3.6=$ km\hr

Now, $3\frac{2}{3}\times 3.6=13.2km/hr$