Evaluate the line integral ∫c(−𝑥 + 𝑦 +

Cinnamon

Cinnamon

Answered question

2022-06-03

Evaluate the line integral ∫c(−𝑥 + 𝑦 + 𝑧) 𝑑𝑥 + (𝑥 + 𝑦 − 𝑧) 𝑑𝑦 + (𝑥 − 𝑦 + 𝑧) 𝑑𝑧 where C is the line segment from the point 𝑃(−1, 2, 3) to 𝑄(3, −2, 1).

Answer & Explanation

karton

karton

Expert2023-05-19Added 613 answers

To evaluate the line integral C(x+y+z)dx+(x+yz)dy+(xy+z)dz, where C is the line segment from the point P(1,2,3) to Q(3,2,1), we can parameterize the line segment and then substitute the parameterization into the integral.
Let's denote the parameter as t, where t varies from 0 to 1 along the line segment PQ. The position vector 𝐫(t) can be expressed as:
𝐫(t)=𝐚+t(𝐛𝐚)
where 𝐚 is the position vector of P and 𝐛 is the position vector of Q.
𝐚=(123)
𝐛=(321)
Substituting the values, we have:
𝐫(t)=(123)+t((321)(123))
Simplifying, we get:
𝐫(t)=(123)+t(442)
Now, we can compute the line integral by substituting the parameterization into the integral:
C(x+y+z)dx+(x+yz)dy+(xy+z)dz
=01[(1+4t)+(24t)+(32t)](4dt)+[(1+4t)+(24t)(32t)](4dt)+[(1+4t)(24t)+(32t)](2dt)
Simplifying and combining like terms, we have:
01(12t)dt
Evaluating the integral, we get:
[12t22]01
=6(12)6(02)
=6
Therefore, the value of the line integral C(x+y+z)dx+(x+yz)dy+(xy+z)dz along the line segment from P(1,2,3) to Q(3,2,1) is 6.

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