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 20th, 2015

Thank you for the opportunity to help you with your question!

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

where K= thermal conductivity
A = area of cross section
d = depth
t1-t2 = temperature difference

thermal conductivity  of water is 0.6 J/s · m · °C
therefore rate of cooling = 0.6*695*(25-12)/2.5 J/s

therefore rate of cooling = 417 *13 / 2.5 = 2147.6 J/s
Hope this helps. If it does please vote my answer. Thanks!

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 20th, 2015

wrong

Jun 20th, 2015

the answer is 2168.4 J/s

sorry for calculation mistake

Jun 20th, 2015

the unit is wrong 

Jun 20th, 2015

it is correct thanks 

Jun 20th, 2015

thanks rate me if you can

Jun 20th, 2015

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