Ace - AI Tutor
Ask Our Educators
Textbooks
My Library
Flashcards
Scribe - AI Notes
Notes & Exams
Download App
Chris Kellner

Chris K.

Divider

Books Assigned

Chemistry The Central Science

Chemistry The Central Science

Theodore L.… 14th Edition
Achievement 1,534 solutions
Introduction to Probability and Statistics

Introduction to Probability and…

William… 15th Edition
Achievement 1,419 solutions
Chemistry: The Central Science in SI Units, Global Edition

Chemistry: The Central Science in…

Theodore L.… 14th Edition
Achievement 1,189 solutions
Essential University Physics - Volume 2

Essential University Physics -…

Richard Wolfson 3rd Edition
Achievement 1,626 solutions

Viewed Questions

A key step in balancing chemical equations is correctly identifying the formulas of the reactants and products. For example, consider the reaction between calcium oxide, CaO(s), and $\mathrm{H}_{2} \mathrm{O}(l)$ to form aqueous calcium hydroxide. (a) Write a balanced chemical equation for this combination reaction, having correctly identified the product as $\mathrm{Ca}(\mathrm{OH})_{2}(a q)$ . (b) Is it possible to balance the equation if you incorrectly identify the product as $\mathrm{CaOH}(a q),$ and if so, what is the equation?

A key step in balancing chemical equations is correctly identifying the formulas of the reactants and products. For example, consider the reaction between calcium oxide, CaO(s), and $\mathrm{H}_{2} \mathrm{O}(l)$ to form aqueous calcium hydroxide. (a) Write a balanced chemical equation for this combination reaction, having correctly identified the product as $\mathrm{Ca}(\mathrm{OH})_{2}(a q)$ . (b) Is it possible to balance the equation if you incorrectly identify the product as $\mathrm{CaOH}(a q),$ and if so, what is the equation?

Chemistry The Central Science

The vitreous humor, a transparent, gelatinous fluid that fills most of the eyeball, has an index of refraction of 1.34. Visible light ranges in wavelength from 380 nm (violet) to 750 nm (red), as measured in air. This light travels through the vitreous humor and strikes the rods and cones at the surface of the retina. What are the ranges of (a) the wavelength, (b) the frequency, and (c) the speed of the light just as it approaches the retina within the vitreous humor?

The vitreous humor, a transparent, gelatinous fluid that fills most of the eyeball, has an index of refraction of 1.34. Visible light ranges in wavelength from 380 nm (violet) to 750 nm (red), as measured in air. This light travels through the vitreous humor and strikes the rods and cones at the surface of the retina. What are the ranges of (a) the wavelength, (b) the frequency, and (c) the speed of the light just as it approaches the retina within the vitreous humor?

University Physics with Modern Physics

The Nature and Propagation of Light

Reflection and Refraction
The cost of auto insurance in California is dependent on many variables, such as the city you live in, the number of cars you insure, and your insurance company. The website www.insurance. ca.gov reports the annual 2017 standard premium for a male, licensed for $6-8$ years, who drives a Honda Accord 20,000 to 24,000 kilometers per year and has no violations or accidents. $^{3}$ $$\begin{array}{lcc}\hline \text { City } & \text { Allstate } & \text { 21st Century } \\\hline \text { Long Beach } & \$ 3447 & \$ 3156 \\\text { Pomona } & 3572 & 3108 \\\text { San Bernardino } & 3393 & 3110 \\\text { Moreno Valley } & 3492 & 3300 \\\hline\end{array}$$ a. What is the average premium for Allstate Insurance? b. What is the average premium for 21st Century Insurance? c. If you were buying insurance, would you care about the average premium cost? If not, what would you want to know?

The cost of auto insurance in California is dependent on many variables, such as the city you live in, the number of cars you insure, and your insurance company. The website www.insurance. ca.gov reports the annual 2017 standard premium for a male, licensed for $6-8$ years, who drives a Honda Accord 20,000 to 24,000 kilometers per year and has no violations or accidents. $^{3}$ $$\begin{array}{lcc}\hline \text { City } & \text { Allstate } & \text { 21st Century } \\\hline \text { Long Beach } & \$ 3447 & \$ 3156 \\\text { Pomona } & 3572 & 3108 \\\text { San Bernardino } & 3393 & 3110 \\\text { Moreno Valley } & 3492 & 3300 \\\hline\end{array}$$ a. What is the average premium for Allstate Insurance? b. What is the average premium for 21st Century Insurance? c. If you were buying insurance, would you care about the average premium cost? If not, what would you want to know?

Introduction to Probability and Statistics

Describing Data with Numerical Measures

Measures of Center

For the data sets find the mean, the median, and the mode. Comment on the skewness or symmetry of the data. A survey by Consumer Reports looked at the reliability of cars as the cars get older. They surveyed owners of cars that were 3 years old, and recorded the average yearly repair and maintenance costs (in dollars) for 15 different models of compact cars $^{2}$ : $\begin{array}{rrrrrrrrr}125 & 45 & 115 & 25 & 110 & 115 & 120 & 45 \\ 40 & 125 & 55 & 90 & 105 & 110 & 80 & \end{array}$

For the data sets find the mean, the median, and the mode. Comment on the skewness or symmetry of the data. A survey by Consumer Reports looked at the reliability of cars as the cars get older. They surveyed owners of cars that were 3 years old, and recorded the average yearly repair and maintenance costs (in dollars) for 15 different models of compact cars $^{2}$ : $\begin{array}{rrrrrrrrr}125 & 45 & 115 & 25 & 110 & 115 & 120 & 45 \\ 40 & 125 & 55 & 90 & 105 & 110 & 80 & \end{array}$

Introduction to Probability and Statistics

Describing Data with Numerical Measures

Measures of Center

Questions asked

ANSWERED

Ivan Kochetkov verified

Numerade educator

A population consists of N=5 numbers: 11, 12, 15, 18, 20. A random sample of size n=3 is selected without replacement. What is the sampling distribution of the sample variance, s^2?

View Answer
 divider
ANSWERED

Ivan Kochetkov verified

Numerade educator

I've read in my statistics books that the standard deviation for the sampling distribution of the sample mean, x bar, is σ (the population's standard deviation), divided by the square root of n. This is stated without proof or explanation. Of course it makes sense that you'd start with σ and that n would be relevant, but I'd like a little more specificity. Can you give me either a proof or at least an intuitive/motivating explanation as to why the standard deviation for the sampling distribution of the sample mean is σ divided by the square root of n? Thanks.

View Answer
 divider
ANSWERED

Mark Scythian verified

Numerade educator

s O h C -h' F I s' (a) Similar triangles, so h'/h = -s'/s Similar triangles, so -h'/h = (s' - f)/f O h C s' - f F h -h' I f s' (b)

View Answer
 divider
ANSWERED

Mark Scythian verified

Numerade educator

For a spherical mirror approximating a parabolic mirror, if the object is beyond the center of curvature, i.e., the center of curvature is between the object and the mirror itself, then the image will be real, inverted, and reduced in size; and if the object is as at the center of curvature, the image will be real, the same size as the original, and inverted. I have a few questions: (1) what governs whether the image forms outside the mirror (real) or behind the mirror (virtual)? (2) why does the image invert in these two scenarios? (3) Why is the image smaller to the left of the center and the same size only at the center? Thanks. P.S. Don't know if I'll get the same person, but recent answers from Kristy B. have been incredibly helpful; thanks so much! And if there's a way for me to give you a positive rating on Numerade, let me know.

View Answer
 divider
ANSWERED

Kristy Bibbey verified

Numerade educator

Near the apex of [a] parabolic mirror . . . you can’t tell whether the shape is parabolic or spherical; a sphere closely approximates the parabola. Because a spherical surface is easier to form, many focusing mirrors are, in fact, spherical. The slight distortion this causes is called spherical aberration. . . . Normally spherical aberration is minimized by making the mirror only a tiny fraction of the entire sphere. In that case the focal length—the distance from the mirror’s apex to its focal point—is much larger than the mirror, so most rays striking the mirror are nearly parallel to the mirror axis. It’s only for such paraxial rays that the approximation of a parabola by a sphere results in accurate focusing.

View Answer
 divider
ANSWERED

Ivan Kochetkov verified

Numerade educator

In the formula to calculate the variance of a population, you divide by N. In the formula to calculate the variance of a sample, you divide by N-1. I understand that using N-1 is called "Bessel's correction" and I've read that using N-1 helps to correct for bias or error. Why is that so? In other words, why is dividing by N-1 more accurate than dividing by N when calculating the variance of a sample? Thanks.

View Answer
 divider
ANSWERED

Kristy Bibbey verified

Numerade educator

60°

View Answer
 divider
ANSWERED

Christopher Dzorkpata verified

Numerade educator

White light goes from air through a glass slab with parallel surfaces. Will its colors be dispersed when it emerges from the glass? I think the answer is no, it will not; because the light will disperse when it passes from the air into the glass, but then the dispersion will be reversed, so to speak, when the light passes from the glass back out into the air. Is this right?

View Answer
 divider