Chapter 3: Problem 3
\(3-32\) Differentiate the function. \(f(x)=186.5\)
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Chapter 3: Problem 3
\(3-32\) Differentiate the function. \(f(x)=186.5\)
These are the key concepts you need to understand to accurately answer the question.
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A runner sprints around a circular track of radius 100 \(\mathrm{m}\) at a constant speed of 7 \(\mathrm{m} / \mathrm{s}\) . The runner's friend is standing at a distance 200 \(\mathrm{m}\) from the center of the track. How fast is the distance between the friends changing when the distance between them is 200 \(\mathrm{m} ?\)
Show that if \(a \neq 0\) and \(b \neq 0,\) then there exist numbers \(\alpha\) and \(\beta\) such that \(a e^{x}+b e^{-x}\) equals either \(\alpha \sinh (x+\beta)\) or \(\alpha \cosh (x+\beta) .\) In other words, almost every function of the form \(f(x)=a e^{x}+b e^{-x}\) is a shifted and stretched hyperbolic sine or cosine function.
On page 431 of Physics: Calculus, 2\(d\) ed, by Eugene Hecht (Pacific Grove, CA: Brooks/Cole, \(2000 ),\) in the course of deriving the formula \(\mathrm{T}=2 \pi \sqrt{\mathrm{L} / \mathrm{g}}\) for the period of a $$ \begin{array}{l}{\text { pendulum of length } L, \text { the author obtains the equation }} \\ {\mathrm{a}_{\mathrm{T}}=-g \sin \theta \text { for the tangential acceleration of the bob of the }}\end{array} $$ pendulum, He then says, "for small angles, the value of \(\theta\) in radians is very nearly the value of \(\sin \theta\) ; they differ by less than 2\(\%\) out to about \(20^{\circ} .\) $$ \begin{array}{c}{\text { (a) Verify the linear approximation at } 0 \text { for the sine function: }} \\ {\sin x=x}\end{array} $$ (b) Use a graphing device to determine the values of \(x\) for which sin \(x\) and \(x\) differ by less than 2\(\%\) . Then verify Hecht's statement by converting from radians to degrees.
The edge of a cube was found to be 30 \(\mathrm{cm}\) with a possible error in measurement of 0.1 \(\mathrm{cm}\) . Use differentials to estimate the maximum possible error, relative error, and percentage error in computing (a) the volume of the cube and (b) the surface area of the cube.
If \(R\) denotes the reaction of the body to some stimulus of strength \(x,\) the sensitivity \(S\) is defined to be the rate of change of the reaction with respect to \(x\) . A particular example is that when the brightness \(x\) of a light source is increased, the eye reacts by decreasing the area \(R\) of the pupil. The experimental formula $$R=\frac{40+24 x^{0.4}}{1+4 x^{0.4}}$$ has been used to model the dependence of \(\mathrm{R}\) on \(\mathrm{x}\) when \(\mathrm{R}\) is measured in square millimeters and \(\mathrm{x}\) is measured in appropriate units of brightness. (a) Find the sensitivity. (b) Illustrate part (a) by graphing both \(\mathrm{R}\) at low levels of of \(\mathrm{x} .\) Comment on the values of \(\mathrm{R}\) and \(\mathrm{S}\) at low levels of brightness. Is this what you would expect?
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