Question

An automobile with 0.260 m radius tires travels 80,000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear?

Answer 1

Answer:

revolutions=48970751

Explanation:

2π radians =1 rev

1rad = 1/2π rev====> θ rad = θ/2π rev

Now:

rev = θ/2π = l/(2π*r)

=80,000,000m/2π*0.260

=48970751 rev