Problem 5 An anchor having mass m = 100 kg has to be raised from a water depth H= 30 m with the help of 200 litre plastic barrel as a float. The barrel has a height h = 1 m, and is attached with the opening down to the anchor as shown in the Fig. 3. Originally, the barrel is filled with water, but with the help of a bicycle pump and a hose, air could be forced into the barrel. The bicycle pump has inner diameter of 1 inch (2.54 cm). The anchor is made of metal with a specific gravity SG = 5, while the density of water, gravitational acceleration and the atmospheric pressure are given as p= 1000 kg/m", g = 10 m/s, and po = 105 Pa, respectively. a Calculate how much force should be applied on the bicycle pump to introduce air into the barrel. b Calculate how much volume of air inside the barrel is needed to lift the anchor. P AI Figure 3