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Assign16

# Assign16 - PHY 53 Summer 2010 Assignment 16 1 Some...

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Assignment 16 1. Some questions about air. a. Explain why warm air rises. b. Explain the afternoon sea breeze. c. Explain why an air bubble in water grows in volume as it rises. d. Show that the upward acceleration of an air bubble in water is not constant, but increases with time. 2. Iced tea is made in a thermos bottle (which effectively prevents heat flow) by putting 700 g of hot tea at 90° C and 160 g of ice at 0° C into the bottle. a. When thermal equilibrium is reached, what state variable for the system has remained unchanged? b. What is the final temperature? c. How much of the ice melted? d. If the ice started at –10° C, what would your answers to (b) and (c) be? [Use c = 1.00 for tea (essentially water), c = 0.530 for ice, both in cal/g-K; use L f = 333 cal/g for ice.] 3. One mole of helium ( c V = 3 R /2 ) at temperature 300 K occupies a volume of 20 L. The gas is expanded at constant pressure to a volume of 40 L, and then expanded adiabatically until the temperature returns to 300 K.

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