2. The population of a country is known to increase at a rate proportional to the number of people presently living in the country. If after two years the population has doubled, and after three years the population is 20,000, estimate the number of people initially living in the country.
2. The population of a country is known to increase at a rate proportional to the number of people presently living in the country. If after two years the population has doubled, and after three years the population is 20,000, estimate the number of people initially living in the country.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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![2. The population of a country is known to increase at a rate proportional to the number of
people presently living in the country. If after two years the population has doubled, and
after three years the population is 20,000, estimate the number of people initially living
in the country.
A fresh cup of coffee has a temperature of 80°C. The coffee is cool enough to drink once
its temperature is 40°C. The ambient temperature is 20°C. After 2 minutes, the coffee
has cooled by 10°C. Using Newton's law of cooling, estimate the total time, after the
coffee was first prepared, for the coffee to be ready to drink.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4061eb31-6ba2-4539-9b51-dd7b05481e7e%2F3fe2fa73-1ff7-448d-a7d0-e35e8fa4ee94%2F295gsx3_processed.jpeg&w=3840&q=75)
Transcribed Image Text:2. The population of a country is known to increase at a rate proportional to the number of
people presently living in the country. If after two years the population has doubled, and
after three years the population is 20,000, estimate the number of people initially living
in the country.
A fresh cup of coffee has a temperature of 80°C. The coffee is cool enough to drink once
its temperature is 40°C. The ambient temperature is 20°C. After 2 minutes, the coffee
has cooled by 10°C. Using Newton's law of cooling, estimate the total time, after the
coffee was first prepared, for the coffee to be ready to drink.
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