# Bouyant force on a cube floating at the surface between water and oil?

by kalisious
Tags: bouyant force, floating, fluids, mass
 Share this thread:
 P: 13 1. The problem statement, all variables and given/known data A cube of 15 cm is floating at the surface between water and oil. The oil has a density of 810 kg/m3. If the cube floats so that it is 52% in water and 48% in the oil, what is the mass of the cube and what is the buoyant force on the cube? 2. Relevant equations Archimede's Principle Fb= densityfluidvfluidg 3. The attempt at a solution Not sure how to find the mass of the cube when only the height of one side is given?
 Sci Advisor HW Helper P: 8,953 The cube is displacing it's own weight in oil and water. it might be simpler to think of it as two (almost ie 0.52/0.48) half cubes immersed in oil and water.
 P: 1 fb = (1000*0.52+810*0.48)*0.15^3*9.8 =30 N mass=fb/g =30/9=3.33

 Related Discussions Introductory Physics Homework 8 Classical Physics 1 Introductory Physics Homework 3 Introductory Physics Homework 5 Introductory Physics Homework 5