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12. Estimating the Age of a Fossil A fossilized leaf contains 70% of its normal amount of carbon-14. How old is the fossil? Use 5730 years as the half-life of carbon-14.

12. Estimating the Age of a Fossil A fossilized leaf contains 70% of its normal amount of carbon-14. How old is the fossil? Use 5730 years as the half-life of carbon-14.

Calculus: Early Transcendentals
Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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7. wood ge of has a that here sent 8. Population Decline The population of a midwestern city follows the exponential law. (a) If N is the population of the city and is the time in years. N as a function of t. express (b) If the population decreased from 900,000 to 800,000 from 2005 to 2007, what was the population in 2009? 9. Radioactive Decay The half-life of radium is 1690 years. If 10 grams is present now, how much will be present in 50 years? 10. Radioactive Decay The half-life of radioactive potassium is 1.3 billion years. If 10 grams is present now, how much will be present in 100 years? In 1000 years? will 11. Estimating the Age of a Tree A piece of charcoal is found to contain 30% of the carbon-14 that it originally had. When did the tree from which the charcoal came die? Use 5730 years as the half-life of carbon-14. 12. Estimating the Age of a Fossil A fossilized leaf contains 70% of its normal amount of carbon-14. How old is the fossil? Use 5730 years as the half-life of carbon-14. 13. Cooling Time of a Pizza A pizza baked at 450°F is removed from the oven at 5:00 PM and placed in a room that is a constant 70°F. After 5 minutes, the pizza is at 300°F. (a) At what time can you begin eating the pizza if you want its temperature to be 135°F? (b) Determine the time that needs to elapse before the pizza is 160°F. (c) What do you notice about the temperature as time passes? the stein has stein be after to reach a t Problem 15. 17. Decomposit conditions, in a swimm uninhibited water and per million water agai 2.2 ppm. W hours)? W shock the shock the 18. Decomp- pentoxid and oxy An initi decomp dinitros long wi remain 19. Decom solutic glucos the la of su much take 20. Dece wate to th 25 1 how 1 k 2 21. Ra rac pc A it re h
Transcribed Image Text:7. wood ge of has a that here sent 8. Population Decline The population of a midwestern city follows the exponential law. (a) If N is the population of the city and is the time in years. N as a function of t. express (b) If the population decreased from 900,000 to 800,000 from 2005 to 2007, what was the population in 2009? 9. Radioactive Decay The half-life of radium is 1690 years. If 10 grams is present now, how much will be present in 50 years? 10. Radioactive Decay The half-life of radioactive potassium is 1.3 billion years. If 10 grams is present now, how much will be present in 100 years? In 1000 years? will 11. Estimating the Age of a Tree A piece of charcoal is found to contain 30% of the carbon-14 that it originally had. When did the tree from which the charcoal came die? Use 5730 years as the half-life of carbon-14. 12. Estimating the Age of a Fossil A fossilized leaf contains 70% of its normal amount of carbon-14. How old is the fossil? Use 5730 years as the half-life of carbon-14. 13. Cooling Time of a Pizza A pizza baked at 450°F is removed from the oven at 5:00 PM and placed in a room that is a constant 70°F. After 5 minutes, the pizza is at 300°F. (a) At what time can you begin eating the pizza if you want its temperature to be 135°F? (b) Determine the time that needs to elapse before the pizza is 160°F. (c) What do you notice about the temperature as time passes? the stein has stein be after to reach a t Problem 15. 17. Decomposit conditions, in a swimm uninhibited water and per million water agai 2.2 ppm. W hours)? W shock the shock the 18. Decomp- pentoxid and oxy An initi decomp dinitros long wi remain 19. Decom solutic glucos the la of su much take 20. Dece wate to th 25 1 how 1 k 2 21. Ra rac pc A it re h
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