An Object's Cooling Constant, K, Is Often Taken to Be

An object's cooling constant, k, is often taken to be proportional to the its surface area. An iron ball cools from 350^oC to 100^oC in 30 seconds in a fast flowing stream of 30^oC water. Use Newton's Law of Cooling to estimate how cool a similar volume of hot iron would become in 30 seconds if it were in the shape of a rod with surface area 3 times larger than the ball's.

A) 30.7^oC
B) 75.9^oC
C) 30.0^oC
D) 33.3^oC

Correct Answer:

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