The person in the figure weighs 170 lb. Each crutch makes an angle of
22.0° with the vertical (as seen from the front). Half of the person’s weight is
supported by the crutches, the other half by the vertical forces exerted by the ground on his feet. Assuming he is at rest and the force exerted by the ground on the crutches acts along the crutches, determine (a) the smallest possible coefficient of friction between crutches and ground and (b) the magnitude of the compression force supported by each crutch.
