# Homework Help: I am so confused, water displaced by a boat

1. Oct 25, 2011

### 1MileCrash

1. The problem statement, all variables and given/known data

A boat floating in fresh water displaces water weighing 34.7 kN.

(a) What is the weight of the water that this boat displaces when floating in salt water of density 1.10 x 10^3 kg/m3?

2. Relevant equations

3. The attempt at a solution

I am utterly confused. They tell me the boat displaces a 34.7 kN weight of water, then ask for the weight of the water displaced. Looks like they gave it to me in the question?

2. Oct 25, 2011

### 1MileCrash

Okay, I've just been informed the weight actually refers to the boat. Answer is still in the question though. :P

3. Oct 25, 2011

### Ibix

Yes. I presume there's a part (b) that's non-trivial.

4. Oct 25, 2011

### 1MileCrash

Yes, simply the difference of volume for the salt water and fresh water displaced.

I did beat the water temple in ocarina of time, I got this.

5. Oct 26, 2011

### aftershock

They give you the weight of the fresh water displaced, they want the weight of the salt water displaced. But since the weight of the water the boat displaces is equal to the weight of the boat (so long as the boat's floating) then yes, they would just be the same value.

6. Oct 26, 2011

### I like Serena

Looks like a problem dedicated to Archimedes' principle.
Apparently the professor thought people would need a hint, so he added question (a)...