A piston–cylinder assembly contains 2 lb of water, initially at 100 $\mathrm{lbf/in.}^{2}$ and $400^{\circ} \mathrm{F}$. The water undergoes two processes in series: a constant-pressure process followed by a constantvolume process. At the end of the constant-volume process, the temperature is $300^{\circ} \mathrm{F}$ and the water is a two-phase liquid–vapor mixture with a quality of 60$\%$. Neglect kinetic and potential energy effects. (a) Sketch $T–v$ and $p–v$ diagrams showing the key states and the processes. (b) Determine the work and heat transfer for each process, all in Btu.

a. Listing What are the general characteristics of solids? b. Comparing and Contrasting How do crystalline solids differ from amorphous solids? c. Drawing Conclusions A glass blower can bend and shape a piece of glass that has been heated. Is glass a crystalline or an amorphous solid? Explain.

Let

$$\begin{gathered} A=\left(\begin{array}{lll} 2 & 1 & 3 \\ 4 & 2 & 7 \\ 1 & 3 & 5 \end{array}\right) \quad B=\left(\begin{array}{lll} 2 & 1 & 3 \\ 1 & 3 & 5 \\ 4 & 2 & 7 \end{array}\right) \\ C=\left(\begin{array}{rrr} 0 & 1 & 3 \\ 0 & 2 & 7 \\ -5 & 3 & 5 \end{array}\right) \end{gathered}$$

(a) Find an elementary matrix $E$ such that $E A=B$.

Presented with recordings of a pair of people of the same sex speaking the same phrase, can a listener determine which speaker is taller simply from the sound of their voice? Twenty four young adults at Washington University listened to 100 pairs of speakers, and within each pair were asked to indicate which of the two speakers was the taller. Here are the number correct (out of 100) for each of the 24 participants:

$$\begin{array}{llllllllllll} 65 & 61 & 67 & 59 & 58 & 62 & 56 & 67 & 61 & 67 & 63 & 53 \\ 68 & 49 & 66 & 58 & 69 & 70 & 65 & 56 & 68 & 56 & 58 & 70 \end{array}$$

Researchers believe that the key to correct discrimination is contained in a particular type of sound produced in the lower airways or the lungs, known as subglottal resonances, whose frequency is lower for taller people. Despite the masking of these resonances by other voice sounds, researchers wondered whether the information they contained could still be heard by listeners and used to identify the taller person.

(a) Make two stemplots, with and without splitting the stems. Which plot do you prefer and why?

(b) Describe the shape, center, and variability of the distribution. Are there any outliers?

(c) If the experimental subjects are just guessing which speaker is taller, they should correctly identify the taller person about 50% of the time. Does this data support the researchers, conjecture that there is information in a person's voice to help identify the taller person? Why or why not?

What kind of hybrid orbitals would we expect the central atom to use for bonding in (a) $\mathrm{PCl_3}$ and (b) $\mathrm{BrCl_3}$?

Write C if the italicized word is used correctly. Write I if the word is used incorrectly.

Our cat and one of her kittens share an aberration - they each have six toes on each paw.

An air-standard cycle with variable specific heats is executed in a closed system and is composed of the following four processes: 1-2 Isentropic compression from 100 kPa and $22^{\circ} \mathrm{C}$ to 600 kPa, 2-3 v = constant heat addition to 1500 K, 3-4 Isentropic expansion to 100 kPa, 4-1 P = constant heat rejection to initial state. (a) Show the cycle on P-v and T-s diagrams. (b) Calculate the net work output per unit mass. (c) Determine the thermal efficiency.

Write a program that reads a key pressed on the keyboard and displays its code on the screen. Use the program to determine the code for the Enter key. Then write a function named ReadOneChar () that reads a character and ignores any succeeding characters until the Enter key is pressed. The entered character should be returned by Readonechar().

Let the total moment of inertia of the car's two rear wheels and axle be $I_{\mathrm{R}}$, and let the total moment of inertia of the two front wheels be $I_{\mathrm{F}}$. The radius of the tires is $R$, and the total mass of the car, including the wheels, is $m$. If the car's engine exerts a torque (couple) $T$ on the rear wheels and the wheels do not slip, show that the car's acceleration is

$$a=\frac{R T}{R^2 m+I_{\mathrm{R}}+I_{\mathrm{F}}} .$$

Strategy: Isolate the wheels and draw three free-body diagrams.

The circuit consists of three resistors and one battery with no internal resistance.
(a) Find the current in the $5.00-\Omega$ resistor.
(b) Find the power delivered to the $5.00-\Omega$ resistor.
(c) In each of the circuits an additional $15.0-\mathrm{V}$ battery has been inserted into the circuit. Which diagram or diagrams represent a circuit that requires the use of Kirchhoff's rules to find the currents? Explain why. In which of these three circuits is the smallest amount of power delivered to the $10.0-\Omega$ resistor? You need not calculate the power in each circuit if you explain your answer.

where is accumulated depreciation on balance sheet?

A small object is placed $20 \ \mathrm{cm}$ from the first of a train of three lenses with focal lengths, in order, of $10$, $15$, and $20\ \mathrm{cm}$.. The first two lenses are separated by $30 \ \mathrm{cm}$ and the last two by $20 \ \mathrm{cm}$ . Calculate the final image position relative to the last lens and its linear magnification relative to the original object when (a) all three lenses are positive, (b) the middle lens is negative, (c) the first and last lenses are negative. Provide ray diagrams for each case.

From The Wall Street Journal (July $23, 1991$): "Since peaking in $1976$, per capita beef consumption in the United States has fallen by $28.6$ percent ... [and] the size of the U.S. cattle herd has shrunk to a $30$-year low."

a. Using firm and industry diagrams, show the shortrun effect of declining demand for beef. Label the diagram carefully and write out in words all of the changes you can identify.

b. On a new diagram, show the long-run effect of declining demand for beef. Explain in words.

Antibonding MOs always have at least one node. Can a bonding MO have a node? If so, draw an example.