Velocipedes

In the 19th century, bicycles did not have a chain drive, and the pedals were connected directly to the wheel axis. This wheel diameter gradually increased until the so-called high bicycles (velocipedes) with a front wheel diameter of up to 1.5 meters, while the rear wheel was only 45 cm. In 1891, Frederick Osmond reached a speed of 38 km/h on a bicycle, a world record. How many times a minute did the front wheel turn?

Correct result:

n =  134.4

Solution:

D=1.5 m v=38 km/h m/s=38/3.6  m/s=10.55556 m/s t=1 min s=1 60  s=60 s  s=v t=10.5556 60=19003633.3333 m o=π D=3.1416 1.54.7124 m n=s/o=633.3333/4.7124=134.4



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