1. What is the pressure on the bottom of an aquarium 0.30 m deep filled with water?

2. The plug in a bathtub is 10 cm^3in area and is 0.8 m below the surface of the water. What is the force of the water on the plug?

3. If a column of oil 0.89 m high in balanced by a column of mercury 0.06 m high, what is density of oil?