# Homework Help: Buoyancy

1. May 10, 2005

### thegreatone

Buoyancy ... HELP NEEDED

A polar bear is partially in water and partially on a slab of ice. The ice sinks to some extent. Calculate the bear's mass.

How can this be done?

I know it comes down to forces but how . . .

Last edited: May 10, 2005
2. May 10, 2005

### DaveC426913

Not forces - it will come down to how much of the bear is in the water and how much is out of the water. However much is out of the water will directly add to the mass of the ice slab, causing it to sink lower, displacing that much more water.

Of course, you can't answer this question without more information (unless you are merely providing an algebraic answer.)

3. May 10, 2005

### thegreatone

70% is out of the water
voume of the ice is 10m^3
bear's specific gravity is 1.0

4. May 10, 2005

### thegreatone

5. May 10, 2005

### thegreatone

help anyone

6. May 11, 2005

### HallsofIvy

You still haven't given us enough information: the ice sinks "to some extent". How much?
The bear's specific gravity is exactly the same as water? What is the specific gravity of the ice?