In this lesson, we will learn how to calculate the density of an object that is submerged in a fluid of a given density.
Sample Question Videos
Bird bones have air pockets in them to reduce their weight—this also gives them an average density significantly less than that of the bones of other animals. An ornithologist weighs an impermeable bird bone in air and in water and finds its mass is 45.0 g and its apparent mass when submerged is 3.60 g.
What mass of water is displaced?
What is the volume of the bone?
What is the average density of the bone?
Logs sometimes float vertically in a lake because one end has become waterlogged and denser than the other. What is the average density of a uniform-diameter log that floats with of its length above water? Use a value of 1,000 kg/m3 for the density of water.
A chunk of iron with a mass of 390.0 g in air is found to have an apparent mass of 350.5 g when completely submerged in an unknown liquid. Assume that the iron has a density of kg/m3.
What mass of fluid does the iron displace?
What is the volume of the iron?
Calculate the fluid’s density.