a 1ft diamter spherical tank completely submerged in freshwater is being towed by a ship at 2ft/s. Determine the required towing power to over come the drag by water in W units. Take water density of 62.4 lbm/ft^3 and viscosity of 6.733*10^-4

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.