A small block placed on a horizontal rotating platform with diameter 305 m will revolve with the platform when it is revolved at a frequency of 30 rev/min, provided that the block is no more than.14 m from the axis. (a) What is the coefficient of static friction between the block and the platform? (b) How far from the axis can the block be placed, without slipping, if the platform rotates at 45 rev/min?