GGRC02H3 Chapter : week1chapternoes

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apricotrhinoceros910

20 Apr 2011

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Advances in medicine, sanitation and nutrition allowed population to grow faster. 1900 the world population was 2 billion, in 2009 population was 6. 8 billion. Most of that growth occurred in developing world and future population growth will take place there due to higher birth rates, reduced death rates, and young populations. Infant mortality rate (imr): the number of deaths to infants less than 1 year old per 1000 births. Life expectancy at birth: number of years a person is expected to live. Poor life expectancy reflect inadequate health care, failure of governments to provide basic needs, or educational differences. Population movement: local residential changes, domestic migration due to job/amenities, international migration. Who moves is just as important as origins and destination of migrants. Most developed countries want people who can invest in the country or have education/skills that are demanded by developed nations.

Related Questions

The fish population P(t) in a lake is suddenly attacked by adisease that render the fish unable to reproduce. Assuming that thedeath rate of the fish is inversely proportional to the square rootof the fish population (i.e. k1 = Î²/â(P) where Î² is aconstant), perform the following tasks:

1. Write a differential equation that models the population offish as a function of time. Assume that the fish are infected bythe disease at t = 0 and define your constants.

2. Solve the differential equation with the initial condition thatP(0) = P0.

3. What is the half-life of the fish population?

4. If there were 900 fish initially, and 441 are left after 6weeks, how long does it take for all the fish to die? Assume thatthe disease was caused by radioactive waste dumped in the lake. Itis discovered that another population of fish, S(t), spontaneouslymutate into the original fish at a rate of k2 (per week) and neverdie. The population S(t) are born at a rate k3.

5. Draw a diagram that describes the life cycle of these twofish populations including your rate constants.

6. Write the differential equations describing the populationsof P(t) and S(t).

Estimate the number of people in the world who are suffering from the common cold on any given day. (Answers may vary. Remember that a person suffers from a cold for about a week, and assume that the average person catches a cold twice a year.) (The population of Earth is approximately 6 billion.)

In February 2002, a total of 60.7 billion kW · h of electrical energy was generated by nuclear power plants in the United States. At that time, the population of the United States was about 287 million people. If the average American has a mass of 60 kg, and if 35.13% of the entire energy output of all nuclear power plants was diverted to supplying energy for a single giant elevator, estimate the height h to which the entire population of the country could be lifted by the elevator. In your calculations, assume also that g is constant over the entire height h. answer in Meters

GGRC02H3 Chapter : week1chapternoes

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