A bicycle tire is 64 cm in diameter. At what frequency does the tire rotate when the bicycle is traveling at a speed of 40 km/s?

Answer 1

40 km/s is equal to 4,000,000 cm/s.

the velocity of the bike is rw where r = tire radius and w = angular velocity of the tire, so

4,000,000 = (32)w, w = 125,000, w = 2*pi*f wherer f = frequency

f = 125,000/2*pi = 19,894.4