1. Intro to Physics Units

You have three objects in front of you. Object A has a volume of $4{\mathrm{cm}}^3$, object B has a volume of $7{\mathrm{cm}}^3$, and object C has a volume of $10{\mathrm{cm}}^3$. They all have the same mass. What is the correct ranking of the objects from most dense to least dense?

The stem of a hydrometer is calibrated from 0 to 10 depending on the length. When it floats in water, the reading is 0. The reading is 10 when floating in a liquid of relative density 1.5. In which liquid of relative density will the reading of the hydrometer be between 0 and 10?