Instructions: Neatly write or type out all your work in the space below each question. Always use -9.81 m/s2 as the acceleration due to gravity. Enter your final answer in the specified place provided. Report your answers with SI units and use 4 decimal places until you get to the final answer. Include both a magnitude and a direction for vector quantities. ALL WORK MUST BE YOUR OWN. 1) (1.5 pts) A student attempts a back extension exercise using two different machines. In the first machine, the student performs the back extension until the body is completely horizontal. With the second machine, the student is positioned at an angle and performs the back extension. The weight of the student's upper body is 430 N and, in both positions, the center of mass of the upper body is 0.3m from the hip joint. Draw and label the following items for machine 1 and machine 2: a. Axis of rotation at the hip b. Moment arm for the body weight c. Arrow indicating the rotation caused by bodyweight d. Arrow indicating the rotation caused by the back extensor muscles Machine 1: Machine 2: 35