By applying a force of 200 N to the pedal of his bicycle, a cyclist exerts a turning moment of 35 Nm on the crank. The bicycle has 48 teeth on the front chainwheel and 18 on the rear sprocket wheel. The wheels are 700 mm in diameter. Calculate the effective length of the crank, the speed of the rear wheel in revolutions/minute when the pedals are being driven at 180 rev/min, the velocity ratio of the machine (i.e. the ratio of the linear speed of the pedals to the linear speed of the outermost surface of the rear wheel), and the force parallel to the road acting on the machine. Neglect any losses.