1) The Earth has mass 5.97210²⁴ kg and radius 6371 km. Find the density of the Earth in g/cm³.

2) Find the difference in blood pressure (in pascals) between the top of a persons head and their feet if the person is 185 cm tall.

The density of blood is 1056 kg/m³.

3) A dome with height h = 25.4 cm is immersed in a fluid of unknown density. The pressure at the top of the dome is 1.0210⁵ Pa and thepressure at the bottom of the dome is 1.4610⁵ Pa. Find the density of the fluid in kg/m³.