/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 2 Consider the differential equati... [FREE SOLUTION] | 91Ó°ÊÓ

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Consider the differential equation \(y^{\prime}(t)=t^{2}-3 y^{2}\) and the solution curve that passes through the point (3,1) . What is the slope of the curve at (3,1)\(?\)

Short Answer

Expert verified
Answer: The slope of the curve at the point (3,1) is 6.

Step by step solution

01

Plug the point into the equation

Substitute the given point (3,1) into the differential equation: \(y^{\prime}(3) = 3^2 - 3(1)^2\)
02

Simplify the equation

Now, simplify the expression: \(y^{\prime}(3) = 9 - 3\)
03

Calculate the slope

Continue simplifying and solve for the slope: \(y^{\prime}(3) = 6\) The slope of the curve at the point (3,1) is 6.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Slope of a Curve
Understanding the slope of a curve is crucial in the study of differential equations. The slope tells us how steep the curve is at any given point, which is fundamental in understanding the behavior of dynamic systems described by these equations. In simple terms:- The slope of a curve at a point reflects how fast the function value is changing at that moment.- Mathematically, this is represented by the derivative, which is typically noted as \(y'\). This derivative gives you an instantaneous rate of change—imagine it as the speedometer reading of a car at a specific instance. For example, in our exercise, the function \(y'(t) = t^2 - 3y^2\) represents the rate of change of \(y\). When evaluating this at the point \((3,1)\), we substitute into the equation to find the specific slope, which we calculated as 6. Thus, at this point, the curve rises quite steeply (as indicated by a relatively larger slope value).
Solution Curve
A solution curve represents the graphical depiction of a solution to a differential equation. It traces the path a particular solution takes on a coordinate plane, giving us visual insights into the system's behavior over time.Key points to remember include:- Each point on the solution curve corresponds to an input-output pair (in terms of our variables \(t\) and \(y\), for instance).- The curve shows how one variable changes with respect to the other, enlightening us about trends, peaks, troughs, or steady states in the model.In the scope of the given differential equation, the solution curve passing through \((3,1)\) is special. This indicates a particular solution where the relationship between \(t\) and \(y\) satisfies the differential equation precisely at all points along this curve. Given the slope at a specific point on this curve, like \((3,1)\), allows us to understand the immediate direction (upwards or downwards) the curve takes at that point.
Initial Value Problem
Initial value problems (IVPs) are a central concept in solving differential equations. They involve finding a function that satisfies a differential equation and meets specified conditions at a given initial point.Here's what you need to focus on:- An IVP includes a differential equation plus an initial condition—often given as \((t_0, y_0)\). This determines a unique solution curve.- The "initial" condition acts as a starting point for solving the equation, making it possible to trace the future behavior of the curve from that specific starting point.In our exercise, we are given a point \((3,1)\), which acts as an initial condition. This directs us to look for a solution curve that passes through this exact point while adhering to the differential equation \(y'(t) = t^2 - 3y^2\). Solving the IVP requires calculating the slope at this point and using it to understand the behavior of \(y\) as \(t\) increases or decreases from 3.

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Most popular questions from this chapter

A differential equation of the form \(y^{\prime}(t)=f(y)\) is said to be autonomous (the function \(f\) depends only on \(y\) ). The constant function \(y=y_{0}\) is an equilibrium solution of the equation provided \(f\left(y_{0}\right)=0\) (because then \(y^{\prime}(t)=0\) and the solution remains constant for all \(t\) ). Note that equilibrium solutions correspond to horizontal lines in the direction field. Note also that for autonomous equations, the direction field is independent of t. Carry out the following analysis on the given equations. a. Find the equilibrium solutions. b. Sketch the direction field, for \(t \geq 0\). c. Sketch the solution curve that corresponds to the initial condition \(y(0)=1\). $$y^{\prime}(t)=6-2 y$$

Solve the equation \(y^{\prime}(t)=k y+b\) in the case that \(k y+b<0\) and verify that the general solution is \(y(t)=C e^{k t}-\frac{b}{k}\)

U.S. population projections According to the U.S. Census Bureau, the nation's population (to the nearest million) was 281 million in 2000 and 310 million in \(2010 .\) The Bureau also projects a 2050 population of 439 million. To construct a logistic model, both the growth rate and the carrying capacity must be estimated. There are several ways to estimate these parameters. Here is one approach: a. Assume that \(t=0\) corresponds to 2000 and that the population growth is exponential for the first ten years; that is, between 2000 and \(2010,\) the population is given by \(P(t)=P(0) e^{n}\) Estimate the growth rate \(r\) using this assumption. b. Write the solution of the logistic equation with the value of \(r\) found in part (a). Use the projected value \(P(50)=439 \mathrm{mil}\) lion to find a value of the carrying capacity \(K\) c. According to the logistic model determined in parts (a) and (b), when will the U.S. population reach \(95 \%\) of its carrying capacity? d. Estimations of this kind must be made and interpreted carefully. Suppose the projected population for 2050 is 450 million rather than 439 million. What is the value of the carrying capacity in this case? e. Repeat part (d) assuming the projected population for 2050 is 430 million rather than 439 million. What is the value of the carrying capacity in this case? f. Comment on the sensitivity of the carrying capacity to the 40-year population projection.

A special class of first-order linear equations have the form \(a(t) y^{\prime}(t)+a^{\prime}(t) y(t)=f(t),\) where \(a\) and \(f\) are given functions of \(t.\) Notice that the left side of this equation can be written as the derivative of a product, so the equation has the form $$a(t) y^{\prime}(t)+a^{\prime}(t) y(t)=\frac{d}{d t}(a(t) y(t))=f(t)$$ Therefore, the equation can be solved by integrating both sides with respect to \(t.\) Use this idea to solve the following initial value problems. $$e^{-t} y^{\prime}(t)-e^{-t} y=e^{2 t}, y(0)=4$$

Solve the differential equation for Newton's Law of Cooling to find the temperature in the following cases. Then answer any additional questions. A pot of boiling soup \(\left(100^{\circ} \mathrm{C}\right)\) is put in a cellar with a temperature of \(10^{\circ} \mathrm{C}\). After 30 minutes, the soup has cooled to \(80^{\circ} \mathrm{C}\). When will the temperature of the soup reach \(30^{\circ} \mathrm{C} ?\)

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