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Re: [Phys-L] Nice question on buoyance and balance

Oops, I did not not notice that the problem was now changed to a floating
ping pong ball. So it is correct. But of course a ping pong ball does not
raise the water much, so I would opt for a floating block of wood which
would raise the water a lot.

John M. Clement
Houston, TX

-----Original Message-----
From: Phys-l [mailto:phys-l-bounces@phys-l.org] On Behalf Of
Carl Mungan
Sent: Wednesday, January 29, 2014 2:14 PM
To: Phys-L@Phys-L.org
Subject: Re: [Phys-L] Nice question on buoyance and balance

ie, tethering the previously floating ball to the floor does
not affect
the scale reading.

The other nice question to add to this soln is:

Say the right-hand beaker has no steel ball in it but has
water up to the same level as the left-hand beaker. Then what?

Answer: The beam balances.

In other words, the weight of a beaker full to level L is the
same as a beaker that has a ping-pong ball floating on its
surface, if it is filled to level L at its edges.

ie. beakers |------| and |--/\--| both have the same weight
| | | \/ |
| | | |
-------- --------
--
Carl E Mungan, Assoc Prof of Physics 410-293-6680 (O) -3729
(F) Naval Academy Stop 9c, 572C Holloway Rd, Annapolis MD 21402-1363
mailto:mungan@usna.edu http://usna.edu/Users/physics/mungan/
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