A 58-kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m. If the skier's speed at...

A 58-kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m. If the skier's speed at point A in the figure below is 8.1 m/s, what is the normal force exerted by the snow on the skier at point B? Ignore frictional forces.