Chapter 6: Problem 6
Evaluate \(\frac{d}{d x}\left(3^{x}\right)\).
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Chapter 6: Problem 6
Evaluate \(\frac{d}{d x}\left(3^{x}\right)\).
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Use the following argument to show that \(\lim _{x \rightarrow \infty} \ln x\) \(=\infty\) and \(\lim _{x \rightarrow 0^{+}}\) \(\ln x=-\infty\). a. Make a sketch of the function \(f(x)=1 / x\) on the interval \([1,2] .\) Explain why the area of the region bounded by \(y=f(x)\) and the \(x\) -axis on [1,2] is \(\ln 2\) b. Construct a rectangle over the interval [1,2] with height \(\frac{1}{2}\) Explain why \(\ln 2>\frac{1}{2}\) c. Show that \(\ln 2^{n}>n / 2\) and \(\ln 2^{-n}<-n / 2\) d. Conclude that \(\lim _{x \rightarrow \infty} \ln x=\infty\) and \(\lim _{x \rightarrow 0^{+}} \ln x=-\infty\)
Compute the following derivatives using the method of your choice. $$\frac{d}{d x}\left(x^{2 x}\right)$$
A body of mass \(m\) is suspended by a rod of length \(L\) that pivots without friction (see figure). The mass is slowly lifted along a circular arc to a height \(h\) a. Assuming that the only force acting on the mass is the gravitational force, show that the component of this force acting along the arc of motion is \(F=m g \sin \theta\) b. Noting that an element of length along the path of the pendulum is \(d s=L d \theta,\) evaluate an integral in \(\theta\) to show that the work done in lifting the mass to a height \(h\) is \(m g h\)
The harmonic sum is \(1+\frac{1}{2}+\frac{1}{3}+\dots+\frac{1}{n} .\) Use a right Riemann sum to approximate \(\int_{1}^{n} \frac{d x}{x}(\) with unit spacing between the grid points) to show that \(1+\frac{1}{2}+\frac{1}{3}+\cdots+\frac{1}{n}>\ln (n+1)\) Use this fact to conclude that \(\lim _{n \rightarrow \infty}\left(1+\frac{1}{2}+\frac{1}{3}+\cdots+\frac{1}{n}\right)\) does not exist.
A spring has a restoring force given by \(F(x)=25 x .\) Let \(W(x)\) be the work required to stretch the spring from its equilibrium position \((x=0)\) to a variable distance \(x\) Graph the work function. Compare the work required to stretch the spring \(x\) units from equilibrium to the work required to compress the spring \(x\) units from equilibrium.
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