Time Needed for a Lake to Freeze over. (a) When the air temperature is below 0oC, the
Question:
(a) When the air temperature is below 0oC, the water at the surface of a lake freezes to form an ice sheet. Why doesn't freezing occur throughout the entire volume of the lake?
(b) Show that the thickness of the ice sheet formed on the surface of a lake is proportional to the square root of the time if the heat of fusion of the water freezing on the underside of the ice sheet is conducted through the sheet.
(c) Assuming that the upper surface of the ice sheet is at –10oC and the bottom surface is at 0oC, calculate the time it will take to form an ice sheet 25 cm thick.
(d) If the lake in part (c) is uniformly 40 m deep, how long would it take to freeze all the water in the lake? Is this likely to occur?
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a EXECUTE Heat must be conducted from the water to cool it to 0C and to cause the phase transition T...View the full answer
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Related Book For 
Physics
ISBN: 978-0077339685
2nd edition
Authors: Alan Giambattista, Betty Richardson, Robert Richardson
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