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

question 37

Multiple Choice

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

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