Adancer spins at 72rpm about an axis through the center with arms outstretched. the dancer mass=90kg, model the head as a uniform sphere r=8.0cm model the trunk and legs as uniform solid cylinder r=12.0cm, arms as slender rods l=60.0cm. on the average the head=7%, both arms together=13% and trunk and legs=80% of body mass. find i and then calculate the rotational ke.15