Chapter 14: Problem 8
Give three equivalent properties of conservative vector fields.
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Chapter 14: Problem 8
Give three equivalent properties of conservative vector fields.
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The cone \(z^{2}=x^{2}+y^{2},\) for \(z \geq 0,\) cuts the sphere \(x^{2}+y^{2}+z^{2}=16\) along a curve \(C\) a. Find the surface area of the sphere below \(C,\) for \(z \geq 0\). b. Find the surface area of the sphere above \(C\). c. Find the surface area of the cone below \(C,\) for \(z \geq 0\).
Evaluate each line integral using a method of your choice. $$\begin{aligned} &\oint_{C} \mathbf{F} \cdot d \mathbf{r}, \text { where } \mathbf{F}=\left\langle 2 x y+z^{2}, x^{2}, 2 x z\right\rangle \text { and } C \text { is the circle }\\\ &\mathbf{r}(t)=\langle 3 \cos t, 4 \cos t, 5 \sin t\rangle, \text { for } 0 \leq t \leq 2 \pi \end{aligned}$$
Explain why or why not Determine whether the following statements are true and give an explanation or counterexample. a. A paddle wheel with its axis in the direction \langle 0,1,-1\rangle would not spin when put in the vector field $$ \mathbf{F}=\langle 1,1,2\rangle \times\langle x, y, z\rangle $$ b. Stokes' Theorem relates the flux of a vector field \(\mathbf{F}\) across a surface to the values of \(\mathbf{F}\) on the boundary of the surface. c. A vector field of the form \(\mathbf{F}=\langle a+f(x), b+g(y)\) \(c+h(z)\rangle,\) where \(a, b,\) and \(c\) are constants, has zero circulation on a closed curve. d. If a vector field has zero circulation on all simple closed smooth curves \(C\) in a region \(D,\) then \(\mathbf{F}\) is conservative on \(D\)
Consider the rotational velocity field \(\mathbf{v}=\langle-2 y, 2 z, 0\rangle\). a. If a paddle wheel is placed in the \(x y\) -plane with its axis normal to this plane, what is its angular speed? b. If a paddle wheel is placed in the \(x z\) -plane with its axis normal to this plane, what is its angular speed? c. If a paddle wheel is placed in the \(y z\) -plane with its axis normal to this plane, what is its angular speed?
Use the procedure in Exercise 57 to construct potential functions for the following fields. $$\mathbf{F}=\langle-y,-x\rangle$$
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