(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

#1 If you hold a block of lead and an identical size block of Styrofoam under water, the buoyant force will

a) be greater on the lead block.

b) be greater on the Styrofoam block.

c) be the same on both blocks.

d) depend on the depth that each block is held.

#2 Salt water has greater density than fresh water. A boat floats in both fresh and in salt water. Where is the buoyant force greater on the boat?

a) in salt water

b) in fresh water

c) buoyant force is the same in both

d) not enough information given to determine the answer

2. Relevant equations

I think this principle is relevant,

Archimedes' Principle:

A fluid exerts an upward buoyant force on a submerged object equal in magnitude to the weight of the volume of fluid displaced by the object.

3. The attempt at a solution

#1 Well, what I can guess from that principle is that the buoyant force will be the same beacuse it depends on the "weight of the volume of fluid displaced" and both the lead block and styrofoam block are the same size.

#2 I got that the answer is (C) from somewhere but I'm unable to reason for that answer. From my experience, I assume the boat will float "more" in salt water than fresh water, which would differ the amount of volume of water displaced. Then, the answer cannot be (C). I'm not so sure,..

thanks!

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# Homework Help: Fluid Statics (multiple choice question)

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