1. An empty storage tank has a volume of 9,470 ft³. What is the buoyant force exerted on it by the air? (Assume the air is at 0C and 1 atm.)

2. A modern-day zeppelin holds 9,760 m³ of helium. Compute its maximum payload at sea level. (Assume the helium and air to be at 0C and 1 atm.)

3. A boat (with a flat bottom) and its cargo weigh 6,400 N. The area of the boat's bottom is 3 m². How far below the surface of the water is the boat's bottom when it is floating in water?

4. A scale reads 274 N when a piece of iron is hanging from it. What does it read (in N) when it is lowered so that the iron is submerged in water?