Question

MATLAB Using predicted values of rainfall, evaporation and water consumption, the urban engineer developed a model...

MATLAB

Using predicted values of rainfall, evaporation and water consumption, the urban engineer developed a model for the amount of water in the reservoir as a function of time as follows.

V(t)= 10^9 + 10^8 (1-e^(-t/100))-rt

where V is the amount of water represented by the litre, t is the time of day, r is the daily consumption rate of the city expressed by the litre/day. Create two user-defined functions. The first function uses the fzero function to define the usage function V(t). In the second function, the fzero function is used to calculate how long it takes to reduce the initial value of 10L(9)L by x percent. The inputs for the second function are x and r. Check the function for x=50 percent and r= 10^(7)L/day.

Homework Answers

Answer #1

Given : V(t)= 10^9 + 10^8 (1-e^(-t/100))-rt

Where ,V is the amount of water represented by the litre

t is the time of day

r is the daily consumption rate of the city expressed by the litre/day.

Code:

function t=watervolume(x,r)

V=@ (t) 10^9 + 10^8 * (1-exp (-t/100) ) - r * t ;

fun = @ (T) V(t) /10^9 * 100 - x;

t = fzero (fun , [0,150]);

end

Explanation : first function is private

In the second function fun we calculates root of non-linear function.

The inputs are gievn as

> x = 50;

> r=10^7;

> watervolume(x , r)

Output:54.183

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