Chapter 13: Problem 14
Find an equation of the plane that passes through the point \(P_{0}\) with a normal vector \(\mathbf{n}\). $$P_{0}(1,2,-3) ; \mathbf{n}=\langle-1,4,-3\rangle$$
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Chapter 13: Problem 14
Find an equation of the plane that passes through the point \(P_{0}\) with a normal vector \(\mathbf{n}\). $$P_{0}(1,2,-3) ; \mathbf{n}=\langle-1,4,-3\rangle$$
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Limits at (0,0) may be easier to evaluate by converting to polar coordinates. Remember that the same limit must be obtained as \(r \rightarrow 0\) along all paths to (0,0) Evaluate the following limits or state that they do not exist. $$\lim _{(x, y) \rightarrow(0,0)} \frac{x-y}{\sqrt{x^{2}+y^{2}}}$$
The flow of heat along a thin conducting bar is governed by the one- dimensional heat equation (with analogs for thin plates in two dimensions and for solids in three dimensions) $$\frac{\partial u}{\partial t}=k \frac{\partial^{2} u}{\partial x^{2}},$$ where \(u\) is a measure of the temperature at a location \(x\) on the bar at time t and the positive constant \(k\) is related to the conductivity of the material. Show that the following functions satisfy the heat equation with \(k=1.\) $$u(x, t)=e^{-t}(2 \sin x+3 \cos x)$$
Find an equation of the plane passing through the point (3,2,1) that slices off the region in the first octant with the least volume.
Describe the set of all points at which all three planes \(x+3 z=3, y+4 z=6,\) and \(x+y+6 z=9\) intersect.
Use the method of your choice to ate the following limits. $$\lim _{(x, y) \rightarrow(-1,0)} \frac{x y e^{-y}}{x^{2}+y^{2}}$$
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