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Unformatted text preview: these conditions. What factors limit the maximum altitude attainable by this method for a given load? (Neglect variables like wind). #3. From the known value of atmospheric pressure at the surface of the Earth, estimate the total number of air molecules in the Earths atmosphere. #4. A copper wire sags 50.0 cm between two utility poles 30.0m apart when the temperature is -15C. Estimate the amount of sag when the temperature is +35C. [Hint: An estimate can be made by assuming the shape of the wire is approximately an arc of a circle; hard equations can sometimes be solved by guessing values]. #5. Consider a container of oxygen gas at a temperature of 20C that is 1.00 m tall. Compare the gravitational potential energy of a molecule at the top of the container (assuming the potential energy is zero at the bottom) with the average kinetic energy of the molecules. Is it reasonable to neglect the potential energy?...
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This note was uploaded on 03/18/2012 for the course PHYSICS H7b taught by Professor Staff during the Spring '08 term at University of California, Berkeley.
- Spring '08