Chapter 11: Problem 13
Find a parametric representation of the surface. $$z=3 x+4 y$$
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Chapter 11: Problem 13
Find a parametric representation of the surface. $$z=3 x+4 y$$
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Identify and sketch a graph of the parametric surface. $$x=u, y=v, z=u^{2}+2 v^{2}$$
For the logarithmic spiral \(r=a e^{b \theta},\) show that the curvature equals \(\kappa=\frac{e^{-b \theta}}{a \sqrt{1+b^{2}}} .\) Show that as \(b \right arrow 0,\) the spiral approaches a circle.
A roller coaster travels at variable angular speed \(\omega(t)\) and \(\mathrm{ra}\) dius \(r(t)\) but constant speed \(c=\omega(t) r(t) .\) For the centripetal force \(F(t)=m \omega^{2}(t) r(t),\) show that \(F^{\prime}(t)=m \omega(t) r(t) \omega^{\prime}(t)\) Conclude that entering a tight curve with \(r^{\prime}(t)<0\) but maintaining constant speed, the centripetal force increases.
Identify and sketch a graph of the parametric surface. $$x=\cos u \cos v, y=u, z=\cos u \sin v$$
Find all values of \(t\) such that \(\mathrm{r}^{\prime}(t)\) is parallel to the \(x y\) -plane. $$\mathbf{r}(t)=\left\langle t^{2}, t, \sin t^{2}\right\rangle$$
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