Due to their zero ozone depletion and low global warming potential natural refrigerants are actively under consideration for commercial refrigeration applications. Investigate the viability of natural refrigerants in systems to improve human comfort and safeguard food. Consider performance benefits, safety, and cost. On the basis of your study, recommend especially promising natural refrigerants and areas of application where each is particularly well suited. Report your findings in a PowerPoint presentation

What does ozone in the stratosphere above the Earth consist of?

Which of the greenhouse gases are the most significant contributors to global warming? How do they work?

What effects can ozone depletion have on the environment?

To what does ozone depletion potential (ODP) refer?

Graph each linear inequality.

$$y < - \frac { 1 } { 3 } x$$

Which helps protect people, animals, plants, and buildings from the harmful effects of air pollution? A. primary pollutants B. secondary pollutants C. ozone layer D. air quality standards

Consider the vectors $v = (1, −2)$ and $w = (2, −5)$. Find and sketch each vector.

$$(a)\ v + w \quad (b)\ 3v \quad (c)\ 2v − 4w$$

You overhear Mrs. Antonelli say, "During fifth period, I teach math. There are four other classes that meed during that period: computer, gym, history and art. I notice some interesting things about the class sizes.

• For every two students in my math class, there is one student in computer class.
• For each student in math class, there are two students in gym class.
• There are two more students in my math class than in the history class.
• There are two more students in the art class than in mu math class." Let $x$ equal the number of students in Mrs. Antonelli's math class. Using $x$, write an expression for the number of students in each class. a. computer b. gym c. history d. art e. Write an expression for the total number of students in the math, computer, gym, and history classes.

Superheat involves adding energy by heat to steam to bring it to a superheated vapor condition at the turbine inlet.

Air Conditioner Outdoor Unit

A circle in a coordinate plane contains points A(1,6), B(6,1), and C(-2,-3). a. Plot these points on graph paper. b. Find the coordinates of the center O of the circle. What is the radius of the circle? c. What is the equation of the circle? d. What is the length of chord $\overline{A C}$? e. What is the measure of $\angle A O C$? What is the measure of $\angle A B C$?

Evaluate expression for $2x+y$ for $x=4$ and $y=5$.

A computer disk drive is turned on starting from rest and has constant angular acceleration. If it took 0.0865 s for the drive to make its second complete revolution,

(a) how long did it take to make the first complete revolution, and

(b) what is its angular acceleration, in $\mathrm{rad} / \mathrm{s}^{2}$?