Evaluate the line integral, where C is the given curve. Integral C x \sin

Jaya Legge

Jaya Legge

Answered question

2021-10-07

Evaluate the line integral, where C is the given curve. Integral C x sin y ds, C is the line segment from (0, 3) to (4, 6)

Answer & Explanation

Nick Camelot

Nick Camelot

Skilled2023-06-17Added 164 answers

Step 1. Parameterize the curve C:
Let x=x(t) and y=y(t) be the parametric equations for the line segment. We can choose t to vary from 0 to 1.
The x-component of the line segment can be parameterized as x(t)=4t.
The y-component of the line segment can be parameterized as y(t)=3+3t.
Step 2. Calculate the derivatives:
Compute the derivatives dxdt and dydt:
dxdt=4 and dydt=3.
Step 3. Calculate the line element ds:
The line element ds is given by ds=(dxdt)2+(dydt)2dt.
Substituting the values, we get:
ds=42+32dt=5dt.
Step 4. Substitute the parametric equations and line element into the integral:
The line integral becomes:
Cxsinyds=01(4t)sin(3+3t)·5dt.
Step 5. Simplify and evaluate the integral:
We can simplify the integral as follows:
Cxsinyds=2001tsin(3+3t)dt.
At this point, you can evaluate the integral numerically using numerical integration techniques or software.
Eliza Beth13

Eliza Beth13

Skilled2023-06-17Added 130 answers

Result:
Cxsinyds=2001tsin(3+3t)dt
Solution:
Let's denote the parameter t that ranges from 0 to 1 along the line segment C. We can express the x and y coordinates of C in terms of t as follows:
x=x(t)=(1t)·x0+t·x1=(1t)·0+t·4=4t
y=y(t)=(1t)·y0+t·y1=(1t)·3+t·6=3+3t
Next, we need to find the derivative of x(t) and y(t) with respect to t. The derivative represents the tangent vector to the curve C:
dxdt=4
dydt=3
The differential arc length ds along the curve C can be calculated using the Pythagorean theorem:
ds=(dxdt)2+(dydt)2dt=42+32dt=5dt
Now we can rewrite the line integral in terms of the parameter t:
Cxsinyds=01(4t)sin(3+3t)·5dt
Simplifying this expression, we have:
Cxsinyds=2001tsin(3+3t)dt
madeleinejames20

madeleinejames20

Skilled2023-06-17Added 165 answers

To evaluate the line integral Cxsinyds, where C is the line segment from (0,3) to (4,6), we can parametrize the curve C as 𝐫(t)=(4t,3+3t) for 0t1. Then the line integral becomes:
Cxsinyds=01(4t)sin(3+3t)|𝐫(t)|dt
where |𝐫(t)| denotes the magnitude of the derivative of 𝐫(t). Now, we differentiate 𝐫(t) with respect to t to obtain 𝐫(t)=(4,3).
Substituting these values, the line integral simplifies to:
Cxsinyds=01(4t)sin(3+3t)|(4,3)|dt=017tsin(3+3t)dt
We can now evaluate this integral to obtain the final result.

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