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If radioactive material decays continuously at a rate proportional to the amount present, find the half-life of the material if after 1 year 99.0 percent of an initial amount still remains. |
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A container of hot soup is taken off the stove at 175 °F and set on a table in a dining room where the ambient temperature is constant at 70 °F. The soup cools to 150 °F in 2 minutes. How much longer will it be until the soup has cooled to 100 °F? Assume that Newton’s Law of Cooling applies. |
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