Where does a body weigh lightest?

[johsun123]

Homework Statement

Hot oil, Hot water, Cold Oil, Cold water

Homework Equations

Upthrust according to flotation principle

The Attempt at a Solution

It will weight lightest when Upthrust by the fluid is highest, which should be cold water.

Answer given was " cold oil".

 

[CWatters]

I think you're right and the answer is wrong. Oil floats on water because it's less dense.

 

[rcgldr]

Only some forms of oil are denser than water, and a person's body weight doesn't change because it's floating, it's just that buoyancing is providing some countering upwards force, which would make this a trick question.

 

[johsun123]

This was not meant to be a trick question, I am sure.

 

[CWatters]

Most types of oil float on water so pretty sure the given answer is wrong.