Posted by **Aravind** on Wednesday, February 23, 2011 at 11:44am.

The radius of a wheel is 7 cm. In covering 44 km, how many revolutions will it make?

- Maths -
**drwls**, Wednesday, February 23, 2011 at 11:51am
N = 44,000 m/(2*pi*0.07 m)

= 100,000 (rounded to 4 sig. figures)

- Maths -
**Ms. Sue**, Wednesday, February 23, 2011 at 11:53am
C = pi * d

C = 3.14 * 14

C = 43.96 cm = 0.4396 meters

1 km = 1000 m

Take it from there.

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