Assume a cyclist of weight mg can exert a force on the pedals equal to 0.90 mg on the average.If the pedals rotate in a circle of radius 18 cm,the wheels have a radius of 34 cm, and the front and back sprockets on which the chain runs have 42 and 19 teeth respectively. Assume the mass of the bike is 12 kg and that of the rider is 65 kg . Ignore friction.
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read what you posted, and
(a) fix the parts you left out
(b) fix the parts you mistyped
(c) maybe ask an actual question