# Buoyancy Problem

1. Dec 2, 2005

### powerbuddy

A rectangular piece of wood ( 5.0 X 4.0 X 3.0 cm) and mass 42g is thrown into the oceon, how do i calculate the percentage of volume floating above the water?

2. Dec 2, 2005

### emptymaximum

what determines if something floats?

ocean

3. Dec 2, 2005

### powerbuddy

the density is 1.428 X 10^-3 kg/m3 for the wood, so it will float right completely above the ocean surface?

Last edited: Dec 2, 2005
4. Dec 2, 2005

### powerbuddy

is this right-??

Volume submerged = Density of wood / Density of oceon water?

5. Dec 2, 2005

### emptymaximum

have you ever seen something float right on the ocean surface?

6. Dec 2, 2005

### emptymaximum

the submerged volume = the volume of water displaced.
right?
if you put a rock in a container of water, the water level rises.

now, what does displacement have to do with floating?

7. Dec 2, 2005

### powerbuddy

in this case i got the density of wood more than that of that oceon so i think it will sink!

8. Dec 2, 2005

### emptymaximum

have you ever seen wood sink?

9. Dec 2, 2005

### emptymaximum

how did you get the density for wood? do you have the right units?