A closed tin of height h contains air at atmospheric pressure. It floats vertically in water as shown below, with a depth k under water. Rust causes a small hole in the base and water leaks in slowly. Show that the tin floats in equilibrium again when the water has risen to fill a height h k/H+k, where H is the height of a water barometer.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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A closed tin of height h contains air at atmospheric pressure. It floats vertically in water as shown below, with a depth k under water. Rust causes a small hole in the base and water leaks in slowly. Show that the tin floats in equilibrium again when the water has risen to fill a height h k/H+k, where H is the height of a water barometer. 

h
Hints
Use Archimedes' theorem to find where the water level is inside the tin. Archimedes'
theorem states that the force on a body which is submerged is an upthrust equal to the
weight of the fluid displaced.
а.
b.
A slow change allows heat flow and is therefore isothermal. Use this to find the pressure
inside the tin.
c.
Is the tin still floating?
d.
H is defined by po = PgH,where p is the density of water.
Transcribed Image Text:h Hints Use Archimedes' theorem to find where the water level is inside the tin. Archimedes' theorem states that the force on a body which is submerged is an upthrust equal to the weight of the fluid displaced. а. b. A slow change allows heat flow and is therefore isothermal. Use this to find the pressure inside the tin. c. Is the tin still floating? d. H is defined by po = PgH,where p is the density of water.
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