Numerade

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Leon Druch

Numerade educator

Use the following information to answer the next four exercises. Recently, a nurse commented that when a patient calls the medical advice line claiming to have the flu, the chance that he or she truly has the flu (and not just a nasty cold) is only about 4%. Of the next 25 patients calling in claiming to have the flu, we are interested in how many actually have the flu. On average, for every 25 patients calling in, how many do you expect to have the flu?

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David Mccaslin

Numerade educator

An equation for loudness $L$ in decibels, is $L=10 \log _{10} R$ where $R$ is the relative intensity of the sound. Solve $130=10 \log _{10} R$ to find the relative intensity of a fireworks display with a loudness of 130 decibels.

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Hubert Agamasu

Numerade educator

The shock wave off the cockpit of the FA 18 in Fig. $17-24$ has an angle of about $60^{\circ} .$ The airplane was traveling at about 1350 $\mathrm{km} / \mathrm{h}$ when the photograph was taken. Approximately what was the speed of sound at the airplane's altitude?

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Gokul R Nair

Numerade educator

In your research lab, a very thin, flat piece of glass with refractive index 1.40 and uniform thickness covers the opening of a chamber that holds a gas sample. The refractive indexes of the gases on either side of the glass are very close to unity. To determine the thickness of the glass, you shine coherent light of wavelength $\lambda_0$ in vacuum at normal incidence onto the surface of the glass. When $\lambda_0$ = 496 nm, constructive interference occurs for light that is reflected at the two surfaces of the glass. You find that the next shorter wavelength in vacuum for which there is constructive interference is 386 nm. (a) Use these measurements to calculate the thickness of the glass. (b) What is the longest wavelength in vacuum for which there is constructive interference for the reflected light?

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Ashwin Banarsee

Numerade educator

The football player at $A$ throws the ball in the $y-z$ plane at a speed $v_{A}=50 \mathrm{ft} / \mathrm{s}$ and an angle $\theta_{A}=60^{\circ}$ with the horizontal. At the instant the ball is thrown, the player is at $B$ and is running with constant speed along the line $B C$ in order to catch it. Determine this speed, $v_{B},$ so that he makes the catch at the same elevation from which the ball was thrown.

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Bryce Werts

Numerade educator

Match the following physical and chemical properties with potassium chloride, KCl, used in salt substitutes, or butane, $\mathrm{C}_{4} \mathrm{H}_{10},$ used in lighters: (11.1) (FIGURE CAN'T COPY) a. melts at $-138^{\circ} \mathrm{C}$ b. burns vigorously in air c. melts at $770^{\circ} \mathrm{C}$ d. contains ionic bonds e. is a gas at room temperature

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INSTANT ANSWER

For the following exercises, consider the graph in Figure 17. If the complete graph of the function is shown, estimate the absolute maximum and absolute minimum.

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C D

Numerade educator

Jasmine often requires her friends' approval when she buys new outfits. Her need is an example of $a(n)$ _____________ drive. a. primary b. acquired (secondary) c. innate d. instinctive

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INSTANT ANSWER

Numerical and Graphical Reasoning A crossed belt connects a 20 -centimeter pulley ( $10-\mathrm{cm}$ radius) on an electric motor with a 40 -centimeter pulley $(20-\mathrm{cm} \text { radius) on a saw arbor (see }$ figure). The electric motor runs at 1700 revolutions per minute. (a) Determine the number of revolutions per minute of the saw. (b) How does crossing the belt affect the saw in relation to the motor? (c) Let $L$ be the total length of the belt. Write $L$ as a function of $\phi,$ where $\phi$ is measured in radians. What is the domain of the function? (Hint: Add the lengths of the straight sections of the belt and the length of the belt around each pulley.)

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Mahendra Kumar

Numerade educator

In Exercises 5–8, use the given conditions to write an equation for each line in point-slope form and slope-intercept form. Passing through (-8, -10)and parallel to the line whose equation is y = -4x + 3

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Juan S.