Question

1. (30 points) You are modeling the biceps of a new life-like robot you are designing. The geometry of the arm has been defined as follow: Di - 5 cm, D2- 15 cm, D325 cm and D4- 18.66 cm (distances in the diagram are shown for the elbow positioned at 90°). The dumbbell weighs 7 kg and the weight of the forearm is 2 kg. (F - ma) a. Plot the moment arm values as a function of the angle (%) for the weight of the dumbbell experienced by the elbow from +45° to -45° b. If b-105° (angle between the arm and bicep) when the elbow is at 90°, calculate the forces at the elbow for the elbow positioned at 90° and when lowered by 45% (extra credit 10 points)

Answer 1

ution :- -も Wd - 740i) - 68 67 N/ i'cm 3 crn Mg.ys. * 1421.81 N-um 0-0 Z0l0 .75 N-cm. 2010-75 Nim I421.81 N-t m. -4S +YS。