# Weight of copper hanging/submerged

#### Mattc

A scale reads 220N when a piece of copper is hanging from it. What does the scale read when it is lowered so the copper is submerged in fresh water.

From a given chart

Density:
copper is 8930 kg/m^3
fresh water is 1000kg/m^3

I found my volume of copper to be .0025m^3

I'm just not sure which direction to go now?

Last edited:
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#### djeitnstine

Gold Member
What forces are involved in buoyancy? Draw a free body diagram. Also write down the definition of buoyancy? Does anything click?

#### Integral

Staff Emeritus
Science Advisor
Gold Member
Since when was volume measured in Kg?

#### Mattc

The forces involved are those from bottom and those on top of object. I have drawn the diagram and I think I know the connection I'm trying to make. The volume of the displaced fluid times density has to relate to the buoyant force? I think its the Newtons thats throwing me off

#### Mattc

Since when was volume measured in Kg?
indeed my teach would've smacked me

#### Mattc

geezzzz nevermind I got it. I thought i was looking over something simple.

While obtaining the forces I was neglecting my 9.8m/s^2

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