5. (10 pts) The zipline is fastened at the top end by a fixed loop. The bottom end is fastened with a spindle and crank that can be tightened from time to time if the tension in the line is unsatisfactory. The crank handle extends beyond the diameter of the spindle. The crank handle extends beyond the diameter of the spindle. Identify as many of the simple machines in the zipline system as possible. 6. Once the zip line has been completed, you walk up a path that takes you to an outcropping. A short bridge leads you to a scenic (concrete) platform overhanging a drop. As soon as everyone in your group has gotten on the 12 mx 12 m platform, your guide closes a gate and pushes a switch. You realize that the platform is attached to a pivot by a 10 m arm. (20 pts) The platform has a total mass of 2850 kg. The lever arm has a mass of 145 kg. The platform swings around to land against another landing 200° around the circle. The swing takes 5 minutes. Take the swing as travelling clockwise relative to the viewer. What is the rotational energy of the platform? 1227 Roo