Posted by **jessica** on Monday, December 6, 2010 at 1:48pm.

One cm of a 10-cm-long rod is made of metal, and the rest is wood. The metal has a density of 5000kg/m^3 and the wood has a density of 500kg/m^3. When the rod is set into pure water, the metal part points downward. How much of the rod is underwater?

- college physics -
**bobpursley**, Monday, December 6, 2010 at 2:19pm
well, you know the metal will all be underwater. So the question is how much wood is under to support the weight of the metal.

bouyancy of wood= h*density water*area*g

that has to equal the weight of the entire rod.

h*densitywater(area)g-.1*densitymetal*g(area -h*denstiywood*area*g=0

dividing out area, g; divideing by density water.

h-.1spgrmetal-hspgrwood=0

h= (.1 spgrmetal)/(1+sprgwood)= about .5/(1.5)=33cm ?

check my work.

## Answer This Question

## Related Questions

- college physics - One cm of a 10-cm-long rod is made of metal, and the rest is ...
- Physics - One cm of a 10-cm-long rod is made of metal, and the rest is wood. The...
- Physics - A thin 5.4-m metal rod sustanins a longitudinal standing wave with ...
- chemistry - A metal rod has a mass of 17.62 g. A graduated cylinder contains 29....
- Physics - The density of a 4.41-m long rod can be described by the linear ...
- Physics - The density of a 4.41-m long rod can be described by the linear ...
- Physics E&M - A slab of metal of volume V is made into a rod of length L. The ...
- Pysics - A 0.480 kg, 37.5 cm long metal rod is sliding down two metal rails that...
- physics - A metal rod is forced to move with constant velocity along two ...
- Physics - The density of a 5.0-m long rod can be described by the linear density...

More Related Questions