The rate of changedtdP of the number of students who heard a rumor is modeled by the following differential equation:dtdP=940198580P(1−780P)At t=0, the number of students who heard the rumor is 149 and is increasing at a rate of 11 students per hour. Find limt→∞P′(t).Answer:
Q. The rate of change dtdP of the number of students who heard a rumor is modeled by the following differential equation:dtdP=940198580P(1−780P)At t=0, the number of students who heard the rumor is 149 and is increasing at a rate of 11 students per hour. Find limt→∞P′(t).Answer:
Given Differential Equation: We are given the differential equation:dtdP=940198580P(1−780P)We want to find the limit of P′(t) as t approaches ∞, which is essentially the long-term behavior of the rate of change of P.
Analysis of Equation: To find the limit of P′(t) as t approaches infinity, we need to analyze the differential equation. The equation is a logistic growth model, which typically approaches a stable value as t approaches infinity.
Stable Value and Carrying Capacity: In the logistic growth model, the stable value, also known as the carrying capacity, is the value of P where the growth rate P′(t) becomes zero. This happens when P equals the denominator of the fraction in the parenthesis, which is 780 in this case.
Approaching Limit: So, as t approaches ∞, P will approach the carrying capacity, and the rate of change P′(t) will approach zero. This is because the term (1−(P/780)) will approach zero as P approaches 780.
Final Limit: Therefore, the limit of P′(t) as t approaches extinfinity is 0.