Question

what is the formula for finding revolutions?

Answer 1

I have this problem: a bicycle with tires 68cm in diameter travels 7.2km. How many revolutions does the wheels make?

Answer 2

What is the circumference of the tires?

Answer 3

isn't it 2 pi r? so, 2*pi* 0.34? = 2.13m

Answer 4

So, now I just divide the circumference by the distance traveled?

Answer 5

THe other way around. Each revolution, the bike travels 2.13 m. How many revolutions does it take to travel 7200 m?

Answer 6

\[\frac{ 7200m }{ 2.13 }\]=3380

Answer 7

Well done!

Answer 8

but what are the units? radians?

Answer 9

The units are revolutions (which is really not a unit at all).

Answer 10

oh, ok

Answer 11

thank you so much!

Answer 12

You're welcome