A pond with a flat bottom has a surface area of 695 m2 and a depth of 2.5 m. On

Physics
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A pond with a flat bottom has a surface area of 695 m2 and a depth of 2.5 m. On a warm day, the surface water is at a temperature of 25°C, while the bottom of the pond is at 12°C. Find the rate at which energy is transferred by conduction from the surface to the bottom of the pond. 

 W
Jun 19th, 2015

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Jun 19th, 2015

The rate of cooling (as such by Newton) is given as = KA(t1 - t2)/d 


where K= thermal conductivity = 0.6 in the given case 
A = area of cross section 
d = depth 
t1-t2 = temperature difference 


therefore rate of cooling = [0.6 x 695 x (25-12)] / 2.5 = 2168.4 J/s 

Jun 19th, 2015

wrong 

Jun 19th, 2015

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Jun 19th, 2015
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