This last problem seems to be causing me the most trouble: Dropping Anchor. An iron anchor with mass 35.0 kg and density 7860 kg/m^3 lies on the deck of a small barge that has vertical sides and floats in a freshwater river. The area of the bottom of the barge is 7.95 m^2. The anchor is thrown overboard but is suspended above the bottom of the river by a rope; the mass and volume of the rope are small enough to ignore. After the anchor is overboard and the barge has finally stopped bobbing up and down, has the barge risen or sunk down in the water? By what vertical distance? I'm not sure how to start this problem since the weight of the parge is unknown, but I'm guessing somehow that doesn't matter. Any suggestions?