A steel bar is heated in a furnace until it reaches 2000°F. The blacksmith observes that it cools to 1500°F in 15 minutes. It needs to be hammered into shape before it gets within 500°F of the room temperature (100°F) before it gets too cold to be shaped properly. After pulling out the steel bar from the furnace, how long does the blacksmith have before it needs to be reheated? Assume that Newton's law of cooling is applicable. O 101.8 min O 76.5 min O 56.6 min O 65.6 min

A steel bar is heated in a furnace until it reaches 2000°F. The blacksmith observes that it cools to 1500°F in 15 minutes. It needs to be hammered into shape before it gets within 500°F of the room temperature (100°F) before it gets too cold to be shaped properly. After pulling out the steel bar from the furnace, how long does the blacksmith have before it needs to be reheated? Assume that Newton's law of cooling is applicable. O 101.8 min O 76.5 min O 56.6 min O 65.6 min

College Algebra

7th Edition

ISBN:9781305115545

Author:James Stewart, Lothar Redlin, Saleem Watson

Publisher:James Stewart, Lothar Redlin, Saleem Watson

Chapter4: Exponential And Logarithmic Functions

Section: Chapter Questions

Problem 14CC

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