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

[Carl Mungan <mungan@usna.edu>]

One more nice problem (I believe it is a Mazur ConcepTest) is:

You have a ball of specific gravity 0.9 and oil of specific gravity 0.8.

A graduated cylinder is about half filled with water. The ball is 
dropped in and floats on top. You make a mark level with the top of 
the ball.

Now you carefully pour in enough oil to cover the ball. (The ball 
continues to float on the water but sinks in the oil because of their 
specific gravities.)

Is the top of the ball now above, at, or below the mark you made?
--
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/