A 61 skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 . If the skier's speed at point...

A 61 skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 .If the skier's speed at point A in the figure is 8.0 , what is the normal force exerted by the snow on the skier at point B? Ignore frictional forces.