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sammy [17]
3 years ago
9

Evaluate the line integral, where c is the given curve. c y3 ds, c.x = t3, y = t, 0 ≤ t ≤ 4

Mathematics
1 answer:
vivado [14]3 years ago
3 0
The path C is parameterized by

\mathbf r(t)=\langle x(t),y(t)\rangle=\langle t^3,t\rangle

with 0\le t\le4.

We have

\dfrac{\mathrm d\mathbf r}{\mathrm dt}=\langle3t^2,1\rangle
\left\|\dfrac{\mathrm d\mathbf r}{\mathrm dt}\right\|=\sqrt{9t^4+1}

So the line integral is

\displaystyle\int_Cy^3\,\mathrm dS=\int_{t=0}^{t=4}t^3\sqrt{9t^4+1}\,\mathrm dt

Substitute u=9t^4+1, so that \mathrm du=36t^3\,\mathrm dt.

=\displaystyle\frac1{36}\int_{u=1}^{u=2305}\sqrt u\,\mathrm du
=\dfrac{2305^{3/2}-1}{54}
\approx2049.31
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