Question

A bicycle with tires 68cm in diameter travels 9.2km. How many revolutions do the wheels make?

I'm guessing for this question I have to use the work done formula, am I right?

Answer 1

`4219` revolutions

Explanation:

diameter= 68cm
r=`68/2cm=0.34m`
distance travelled=9.2 km=9200 m
circumference of the tire=`2pir=2*3.14*0.34=2.13m`
so, 1rev.`rarr` 2.13 m
2.13m `rarr` 1rev
1m `rarr` `1/2.13rev`
`9200m rarr 1/2.13*9200=4219` revolutions. (approx)