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PHYS153assign2a - UB hys C ics 15 20 3 10 Physics 153...

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Physics 153 Assignment 2a Due the day of your Tutorial in the week of October 4-8, 2010 1. (a) Two 50g ice cubes are dropped into 200g of water in a glass. If the water was initially at a temperature of 25 C , and if the ice came directly from the freezer at - 15 C , what will the temperature of the drink be when the ice and water reach the same temperature? (b) How much ice is left? (c) Suppose that only one ice cube had been used in part (a), what would be the final temperature of the drink? Neglect the heat capacity of the glass. 2. A copper-bottomed saucepan containing 0.8L of boiling water boils dry in 10min. Assuming that all heat flows through the flat copper bottom, which has a diameter of 15cm and a thickness of 3.0mm, calculate the temperature of the outside of the copper bottom while some water is still in the pan. 3. A small pond has a layer of ice 1cm thick floating on its surface. (a) If the air temperature is - 10 C , find the rate in cm per hour at which ice is added to the layer. The thermal conductivity of ice is 0 . 592 W/mK . (b) How long does it take for a 20cm layer to build up?
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