PS2_Key - Chemistry 2080 Spring 2009 Problem Set #2 - due...

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Chemistry 2080 Spring 2009 Problem Set #2 - due date: Friday February 6th at 2 pm Name:__ _(Key)________ Lab TA Name:__________________ Lab Day/Time:______________________ Practice problems (not graded). Chapter 7: 24, 29, 33. 1) Cayuga Lake has a surface area of about 172 km 2 and a volume of 9.4 km 3 . When the sun is shining brightly in the Summer, it is pouring about 200 watts per meter 2 onto the surface of the lake. How many hours of bright sunshine would be needed to raise the temperature of the surface of the lake, down to a depth of 2 meters, by 10°C? Assume that the energy of the sunshine is captured completely by the top 2 meters of the lake, that there is no loss of heat to the environment during periods of no sunshine, and that the top 2 meters of the lake gets magically stirred, without mixing with the water below. [Note that 1 watt = 1 J/sec]. For this problem, we don’t need to know the area of the lake, we can do the calculation on any one square meter. Each m 2 of the lake has associated with it a volume of 2.0 m 3 . This volume of water weighs 2 x 10 6 g. 200 watts = 200 J/sec, or (200 x 60 x 60) J/hour.
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PS2_Key - Chemistry 2080 Spring 2009 Problem Set #2 - due...

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