<<<<< If you have a toy boat in the bathtub, filled with nuts and bolts,
and you tip the boat over, dumping its cargo to the bottom of the
tub, what happens to the water level in the tub? (note, the boat
returns to it original floating position and takes on no water.) >>>>
Answer: the water level drops (less water is displaced -- as before the
weight of water displaced equals the weight of the cargo and boat,
afterwards, the amount of water displaced is the weight of the boat plus
the volume of the cargo and as water is less dense than the cargo.....)
<<<<<< Also,
I give you two cylinders, both identical in appearance and weight.
One is made of aluminum, and is solid. The other is made of gold,
and has the center hollowed out (outside surfaces are unbroken,
however.) Both are painted an identical non-conducting British
Racing Green (obligatory lame attempt at LBC content).
Performing only non-destructive testing, with materials/methods
available in the typical household, how can you tell which cylinder
is which? Tapping on the cylinders with a mallet produces identical
sounds.>>>>>>
Easy : measure the rotary moment of intertia: ie. how much force will it
take to make each object spin or stop spinning?
Simon
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Simon Matthews Avant! Corporation
Phone: (510) 413-8820
Fax: (510) 413-8080
E-mail: simon_matthews@avanticorp.com
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