The document describes a Dynamo exercise to model population changes over time using variables like birth rate, death rate, and average life. It provides scenarios to independently apply delays to when people enter the birth-giving population, as well as ramps, steps, and pulses to the birth rate. It also includes a table changing average life with population size and asks to compare the effects of each change on population levels and rates, explain the physical meaning of the changes, and what they could represent.

1. Dynamo Exercise
Population
Birth Death
Percentage of Women Giving Birth
Avelife
N POPULATION=10
C PERCENTAGE OF WOMEN GIVING BIRTH=0.10
C AVELIFE=60
LENGTH=50 years
DT=0.25
Apply each of the following scenarios independently of each other.
1. Apply “delay1” for birth before a person becomes part of the birth giving
population. Identify the effect of each. Assume that it takes 14 years before
maturity. Do the same for delay2 and delay3.
2. Use “ramp” to generate a constant increase in birth before resuming back to its
normal rate.
3. Use “step” to generate a sudden increase in birth, before going back to its normal
rate.
4. Use “pulse” to generate sudden regular increases across time for birth
5. Use a table to represent changes in average life as population increases.
Population 0 400 800 1200
(millions)
Avelife 60 75 55 60
Requirement:
Compare the effect of each of these changes in the population level and its rates and
explain how it affects the variables. What could these changes in the graphs mean? What
could be the physical meaning of each of these changes?