How many Revolutions

Question

The radius of the front wheel of Lisa's bike is 59cm.

Lisa goes for a cycle and travels 40.41km.

How many full revolutions did Lisa's front wheel complete?

Answer 1

Idea here is to translate d covered into revolutions N The connection is that d can be computed in terms of circumference and then R found from it. The formula for C = circumference is C 2PiR, where Pi: 3,14 AND R is the radius.

So, d / (2PiR) equals the number of revolutions N. Plug in 40410 for d and divide by 2Pi (0.59) and you will get the answer. Note that you need to make units consistent, e.g. meters in the numerator and meters in the denominator. If you don't your answer will be "off" by a power of ten.