Homework Statement
Population Dynamics: Logistic model. Suppose the environmental carrying capacity of the population is 100000 and the growth rate a t=0 is 5%. . If the population starts at 10000, how long does it take for the population to reach half the carrying capacity?
dp/dt = A P...
Homework Statement
Need help on part a.
and c.
The Attempt at a Solution
Part A
Since Va = 4V then pin 2 and 3 also have 4v. Would that mean that Vin is = 4v as well?
Im just confused how to find I1.
Also I am not sure how to find Vc.
Part C
As for part c, I am having trouble with it...
Homework Statement
[Picture of Problem](http://i.imgur.com/7q4yj8O.png)
Homework Equations
[/B]
* It is dealing with drawing the DC model of a circuit
* Now i know when drawing a DC Model, all capacitors are open (or ground) and AC sources are grounded as well.
* In this specific problem, i...
Homework Statement
How many anions are there in 1.50 g of MgBr2
Homework EquationsThe Attempt at a Solution
1.5 g MgBr2 x (1 mol MgBR2/184.3 g MgBr2) x (6.022 x 1023 anions/mol)
which gave me answer of 4.91 x 1021
the correct answer is 9.81 x 1021
am i missing a step, or do i have to...
Homework Statement
How much energy is required to decompose 765 g of PCl3, according to the reaction below? The molar mass of PCl3 is 137.32 g/mol and may be useful.
4 PCl3(g) → P4(s) + 6 Cl2(g) ΔH°rxn = +1207 kJ
The Attempt at a Solution
765 g PCl3 x 4 mol PCl3/137.32 g PCl3 = 22.28 mol...
Homework Statement
Suppose that z is a linear function of x and y with slope -1 in the x direction and slope 4 in the y direction.
Part a)
A change of −0.1 in x and 0.3 in y produces what change in z?
z = ?
Part b)
If z=5 when x=7 and y=6, what is the value of z when x=7.1 and y=5.7?
z = ...
Homework Statement
Find the linearization of the function ƒ(x,y) = sqrt(29 - 4x2 - 4y2) at the point (2,1)
Homework Equations
[/B]
Point (a,b)
L(x,y) = Linearization
L(x,y) = ƒ(a,b) + ƒx(a,b)(x-a) + ƒy(a,b)(y-b)
The Attempt at a Solution
[/B]
ƒ(2,1) = 3
ƒx(x,y) =...