Question 1108434
A woman rides a bicycle for 1 hour and travels 16km. find the angular velocity of the wheel if the radius is 30 cm. 
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16 km = 16000 meters = 1.6e6 cm
Each rev moves the bike 2pi*30 = 60pi cms
# of revs = 1.6e6/(60pi) =~ 8488
--> 8848 rev/hour