Solve Exercise 71.1 page 341 on pdf Math Models Mathematical Models: Mechanical

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Solve Exercise 71.1 page 341 on pdf Math Models

Mathematical Models: Mechanical Vibrations, Population Dynamics, and Traffic Flow by Richard Haberman

Math Formulas to solve problems in book on this link

http://math.gmu.edu/~sap/S12/m414/Supplementary/Haberman-Mathematical%20Models.pdf

The nonlinear first-order partial differential equation derived from conserva tion of cars and the Fundamental Diagram of Road Traffic is dq(P) de dp (71.1) In the previous sections we considered approximate solutions to this equation in cases in which the density is nearly uniform. The traffic was shown to vary via density waves. We will find the techniques of nearly uniform traffic density to be of great assistance. Again consider an observer moving in some prescribed fashion (0). The density of traffic at the observer changes in time as the observer moves about, dp D p , dx a p dt F dt dt at (71.2) By comparing equation 71.1 to equation 71.2, it is seen that the density will remain constant from the observer's viewpoint (-. de dt (71.3) or p is a constant, if dx dq(p) a a(P). de dp (71.4)

Explanation / Answer

It is given that q(p) = ap [ log (Pmax ) - logp ]

So dq(p)/dp = a . 1 [log(pmax) - logp] + ap[ 0 - 1/p]

= a [ log(pmax) - logp - 1]

For q(p) to be maximum dq(p)/dp = 0

a [ log(pmax) - logp - 1] = 0

log(pmax) - logp - 1 = 0

log(ppmax) - 1 = 0

log(ppmax) =1

ppmax = e

So p = e / pmax.

If p = pmax /2, q(p) becomes q(p)= apmax /2 [ log (Pmax ) - logpmax /2 ] = apmax /2 [ log (Pmax ) - logpmax + log2 ]

= apmax log2/2

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