MidTerm2A - PHY 126 Mid-term Exam IIA Chapters 15,16,17...

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PHY 126 Mid-term Exam IIA Chapters 15,16,17 Problem 1 ( 15+15 points) A Styrofoam box used to keep drinks cold at a picnic has total wall area (including the lid) of 0.80 m 2 and wall thickness 2.0 cm. Now it is filled with ice at 0 o C. If needed, use the thermal conductivity of Styrofoam is 0.010 W/(m K) and the heat of fusion of ice is 3.34 x 10 5 J/kg. (a) What is the rate of heat flow into the box in J/s if the temperature of the outside wall is 30 o C? (15 points) (b) How much ice in kg melts in one day? (15 points) (Hint: We assume that the total heat flow is approximately the same as it would be through a flat slab of area 0.80 m 2 and thickness 2.0 cm = 0.020 m.) 30 o C 0 o C
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Problem 2 ( 7+7+8+8 points) H A jet of water is directed vertically from a nozzle connected to a reservoir through a pipe as shown in Figure. The diameter of the nozzle outlet is and the jet operates H under the surface of the water. n
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MidTerm2A - PHY 126 Mid-term Exam IIA Chapters 15,16,17...

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