A 50.0 kg child stands at the rim of a merry-go-round of radius 1.90 m rotating with an angular speed of 3.00 rad/s. (a) What is the child's centripetal acceleration? (b)What is the minimum force between her feet and the floor of the merry-go-round that is required to keep her in the circular path? (c) What minimum coefficient of static friction is required? Need some help getting started. Don't really know where to go here?