Blowguns: In Amazon forrests hunters shoot poisoned darts through hand-crafted blowguns to kill monkeys and birds. After inserting a dart the hunter points the tube vertically, takes a deep breath then blows the dart from the tube. The masses of the monkey and dart are 1.8 kilograms and 6.2 grams, respectively. The inside diameter of the blowgun is 0.8 cm. Assume the event occurs without friction. Ignore the friction of the dart sliding inside the gun, the force required to push the air ahead of the dart out of the tube and the drag of the surrounding air as the dart moves upward. Use the data of the figure.

a) Calculate the least work expended by the hunter. What system did you use?

b) Calculate the average propulsive pressure of discharge of the dart. What is the system?

c) If the monkey is hit (with the dart fired as usual) With the dart and monkey as the system, what energy change does the monkey experience?