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Date Posted: Thursday, November 27 2008, 18:30:21
Author: Fred
Subject: Re: mercury lens floation
In reply to: Bob Pass 's message, "Re: mercury lens floation" on Thursday, November 27 2008, 15:23:00

I've been looking at an article on bouyancy and realised that the lens does not displace 4.5 tons of mercury.

In the example given two pieces of wood,one oak,one balsa the same size were floated in water.
The oak floated lower in the water due to its higher weight (density) then balsa.
So the oak displaced more water and floated lower in the water.

Archimedes principle A floating object will displace a volume of fluid that has a weight equal to the weight of the object that is floating.

Since mercury is very dense compared to bronze and glass and a lens has a large volume for its weight,would not a smaller weight of mercury be displaced and that smaller weight of mercury being the amount required to float the lens?

It goes on to state the bouyancy force felt by an object is equal to the weight of the fluid displaced.

So there is an upwards force?

It's 2.30am,but there is surely an answer in there somewhere?

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