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PHY7A Quiz4Sol

# PHY7A Quiz4Sol - Quiz#4 Solutions 29th August 2007 Warning...

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Quiz #4 Solutions 29th August 2007 Warning: These solutions are through, as they have to make sure everyone understands the problem. They are probably considerably longer than your answer.

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The room temperature is 20 o C, and the oil inside is level as shown. What is the pressure in the region labelled A ? 1 a) 1 atmosphere Closed off open to air 20 C A Analyse the two points shown. They are in the same fluid system. No KE and no change in E thermal (I = 0) Same height KE/vol PE/vol P E th /vol By continued application of the idea that two fluids in contact have the same pressure. Δ P = 0 P 1 = P 2 P 1 = 1 atm P A = 1 atm 1 2 X X X
1b) A person with a skin temperature of 35 o C grabs the bottle. The air and oil inside the bottle quickly come into thermal equilibrium with the skin. What is the pressure of the gas in the section labelled A ? Note: you may assume the oil level outside the straw changes by a negligible amount, but the oil level in the straw will change.

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