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astrophysicsm
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Homework Statement
To measure how far below the ocean surface a bird dives to catch a fish, a scientist uses a method originated by Lord Kelvin. He dusts the interiors of plastic tubes with powdered sugar and then seals one end of each tube. He captures the bird at nighttime in its nest and attaches a tube to its back. He then catches the same bird the next night and removes the tube. In one trial, using a tube 7.40 cm long, water washes away the sugar over a distance of 2.46 cm from the open end of the tube. Find the greatest depth to which the bird dived, assuming the air in the tube stayed at constant temperature. (Assume the density of the ocean water is 1030 kg/m3.)
Homework Equations
Ideal gas law:
PV=nRT
Density = m/V
The Attempt at a Solution
I think this might have to do with the pressure of the air inside the tube and the pressure at the desired water depth. I can apply this given the change in volume, however, only length is provided and the volume of the tube is not known. I can replace the volume by mass/density in the equation:
P.(m/D) = nRT
But I'm stuck at this point.
Thanks for any help in advance!
astrophysicsm