Problem B1: If you spin duct tape attached to a string around in a vertical orientation, then the centripetal force will change along the path Draw a free body diagram including all the forces on the duct tape at the four indicate d l ocations ( see dots on the figure belo w) , then circle the radial forces. Example 5 - 13: A small ball of mass 𝑚 , suspended by a cord of length 𝑙 , revolves in a circle of radius 𝑟 = 𝑙 × 𝑆𝑖𝑛 ( 𝜃 ) where 𝜃 is the angle the string makes with the vertical. (a) Draw a FBD on the ball. (b) In what direction i s the acceleration of the ball, and what causes the acceleration? ( c ) calculate the speed and period (time required for one revolution) of the ball in terms of 𝑙 , 𝜃 , 𝑔 and 𝑚 Example 5 - 13 FBD with components 55. (II) Tarzan plans to cross a gorge by swinging in an arc from a hanging vine (Fig. 5 – 47). If his arms are capable of exerting a force of 1350 N on the rope, what is the maximum speed he can tolerate at the lowest point of his swing? His mass is 78 kg and t he vine is 5.2 m long.