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

by kalisious
Tags: bouyant force, floating, fluids, mass
kalisious is offline
Nov11-09, 09:11 PM
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?
Phys.Org News Partner Science news on
Cougars' diverse diet helped them survive the Pleistocene mass extinction
Cyber risks can cause disruption on scale of 2008 crisis, study says
Mantis shrimp stronger than airplanes
mgb_phys is offline
Nov11-09, 10:11 PM
Sci Advisor
HW Helper
P: 8,961
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.
imjagat is offline
Dec1-09, 01:05 PM
P: 1
fb = (1000*0.52+810*0.48)*0.15^3*9.8
=30 N


Register to reply

Related Discussions
An ice cube floating in water, what is the volume of the part under water? Introductory Physics Homework 8
Bouyant Force on a Scale Classical Physics 1
[SOLVED] Bouyant force Introductory Physics Homework 3
Work of Bouyant Force Introductory Physics Homework 5
Bouyant Force Introductory Physics Homework 5