Calculating Volume and Density: A Wrestler's Underwater Apparent Weight of 80N

[megob]

Homework Statement

A wrestler weights 980N. His apparent weight when fully submerged in water is 80N. Find his volume and density.

Homework Equations

I cannot figure out how to begin this problem.

The Attempt at a Solution

 

[catkin]

Do you know an equation that relates weight, volume and density? And another that relates them while the object is submerged in a liquid?

 

[megob]

Do you know an equation that relates weight, volume and density? And another that relates them while the object is submerged in a liquid?[/QU

Well, I'm going to say no...This teacher is horrible! The information that is given on the board does not even match up with what is in our book. I'll try and look around for some answers...Thanks!

 

[catkin]

Weight = mass x acceleration due to gravity
Where
Weight in Newtons, N
Mass in kilograms, kg
Acceleration in meters per second per second, ms^(-2). 9.81 at surface of Earth

See http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

Mass = volume x density
Where mass in kilograms, kg
Volume in cubic meters, m^3
Density in kilogram per cubic meter, kgm^(-3)

For buoyancy see http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

 

[megob]

Weight = mass x acceleration due to gravity
Where
Weight in Newtons, N
Mass in kilograms, kg
Acceleration in meters per second per second, ms^(-2). 9.81 at surface of Earth

See http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

Mass = volume x density
Where mass in kilograms, kg
Volume in cubic meters, m^3
Density in kilogram per cubic meter, kgm^(-3)

For buoyancy see http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

Thank You!