A student breaks a thermometer and spills most of the mercury (Hg) onto the floor of a laboratory that measures 15.2 m long, 6.6 m wide, and 2.4 m high. (a) Calculate the mass of mercury vapor (in grams) in the room at 20 degree C. The vapor pressure of mercury at 20 degree C is 1.7*10^(-6) atm. (b) Does the concentration of mercury vapor exceed the air quality regulation of 0.050 mg Hg/m3 of air? (c) One way to treat small quantities of spilled mercury is to spray sulfur powder over the metal. Suggest a physical and a chemical reason for this action.

Early golf balls were smooth spheres. Later it was discovered that golf balls flew better when they were dimpled. On January 1 , 1932, the United States Golf Association set standards for the weight and size of a golf ball. The minimum diameter of a regulation golf ball is $1.680$ inches. Use $3.14$ for $\pi$. Round to the nearest hundredth.

Find the volume of a smooth golf ball with the minimum diameter allowed by the United States Golf Association.

According to the passage, the federal government was hesitant to pass child labor restrictions because

A. barons of industry bribed the judges on the Supreme Court.

B. officials were too busy with the Spanish-American War and World War I.

C. the plight of child labor affected only non-citizens.

D. too much government regulation of private industry is unconstitutional.

E. the state had already restricted the most severe forms of child labor.

Symbols are appealing because they often carry powerful associations and emotional overtones. Write a brief essay analyzing the symbolism in "Through the Tunnel." First, consider the three settings: the wild beach, the safe beach, and the tunnel. Tell what you think each setting must symbolize for Jerry. Then, consider the larger symbolic meaning of Jerry's passage through the tunnel. What does his trip represent? Why is it a powerful symbol? Support your analysis, and elaborate with direct references to details in the story. (You can take notes in a chart.)

A species of bacteria can synthesize the amino acid histidine so it does not require histidine in its growth medium. A key enzyme, which we will call histidine synthetase, is necessary for histidine biosynthesis. When these bacteria are given histidine in their growth media, they stop synthesizing histidine intracellularly. Based on this observation alone, propose three different regulatory mechanisms to explain why histidine biosynthesis ceases when histidine is in the growth medium. To explore this phenomenon further, you measure the amount of intracellular histidine synthetase protein when cells are grown in the presence and absence of histidine. In both conditions, the amount of this protein is identical. Which mechanism of regulation would be consistent with this observation?

A student breaks a thermometer and spills most of the mercury $(\mathrm{Hg})$ onto the floor of a laboratory that measures $15.2 \mathrm{~m}$ long, $6.6 \mathrm{~m}$ wide, and $2.4 \mathrm{~m}$ high.

(a) Calculate the mass of mercury vapor (in grams) in the room at $20^{\circ} \mathrm{C}$. The vapor pressure of mercury at $20^{\circ} \mathrm{C}$ is $1.7 \times 10^{-6}$ atm.

(b) Does the concentration of mercury vapor exceed the air quality regulation of $0.050 \mathrm{mg} \mathrm{Hg} / \mathrm{m}^3$ of air?

(c) One way to deal with small quantities of spilled mercury is to spray sulfur powder over the metal. Suggest a physical and a chemical reason for this action.

Which of the following is true regarding the role of the amygdala in memory? a. The amygdala help process implicit memories. b. The amygdala support Freud’s ideas about memory because they allow us to repress memories of trauma. c. The amygdala produce long-term potentiation in the brain. d. The amygdala help make sure we remember events that trigger strong emotional responses. e. The amygdala are active when the retrieval of a long-term memory is primed.

The table shows regulation distances between hurdles in woman's and men's races. In both the women's and men's events, the race consists of a straight track with 10 equally spaced hurdles.

$$\begin{matrix} \text{Event} & \text{Distance of Race} & \text{Distance from Start to First Hurdle} & \text{Distance Between Hurdles} & \text{Distance from last Hurdle to Finish}\\ \text{Women's} & \text{100 m} & \text{13.00 m} & \text{8.50 m} & \text{ }\\ \text{Men's} & \text{110 m} & \text{13.72 m} & \text{9.14 m} & \text{ }\\ \end{matrix}$$

Find the distance from the last hurdle to the finish line for the men's race.

Go to www.federalreserve.gov and select the "Banking Information & Regulation" tab. Then click on the links "Banking Data" and "Large Commercial Banks." Once there, select the most recent quarterly data release. a. Which of the following banks has the most consolidated assets? b. Which of the following banks has the most domestic assets? c. What percentage of US GDP are the bank's domestic assets listed in part b? (Hint: You can find U.S. GDP at http://research.stlouisfed.org/fred2/ series/GDP?cid=106 using the links "Gross Domestic Product (GDP)" and then "Current-dollar and 'real' GDP.")

Refer to the zener diode datasheet. (a) What is the maximum dc power dissipation at $25^{\circ} \mathrm{C}$ for a $1 \mathrm{~N} 4738 \mathrm{~A}$ ? (b) Determine the maximum power dissipation at $70^{\circ} \mathrm{C}$ and at $100^{\circ} \mathrm{C}$ for a $1 \mathrm{~N} 4751 \mathrm{~A}$. (c) What is the minimum current required by the $1 \mathrm{~N} 4738 \mathrm{~A}$ for regulation? (d) What is the maximum current for the $1 \mathrm{~N} 4750 \mathrm{~A}$ at $25^{\circ} \mathrm{C}$ ? (e) The current through a $1 \mathrm{~N} 4740 \mathrm{~A}$ changes from $25 \mathrm{~mA}$ to $0.25 \mathrm{~mA}$. How much does the zener impedance change?

A widget manufacturer determines that if she manufactures x thousands of widgets per month and sells the widgets for y dollars each, then her monthly profit (in thousands of dollars) will be $P=x y-\frac{1}{27} x^{2} y^{3}-x$. If her factory is capable of producing at most 3,000 widgets per month, and government regulation s prevent her from charging more than $2 per widget, how many should she manufacture, and how much should she charge for each, to maximize her monthly profit?

Indicate whether each of the following statements is true or false.

1. When designing an accounting system, we need to think about the needs and knowledge of both the top managers and various other users.

2. When the environment changes as a result of technological advances, increased competition, or government regulation, an accounting system does not have to be sufficiently flexible to meet the changes in order to save money.

3. In developing an accounting system, cost is relevant. The benefits obtained from the information disseminated must outweigh the cost of providing it.

Use the following information for this exercise .

The table shows regulation distances between hurdles in women's and men's races. In both the women's and men's events, the race consists of a straight track with 10 equally spaced hurdles.

Find the distance from the last hurdle to the finish line for the men's race.

Genes produce molecules called mRNA that then produce proteins. High levels of protein can inhibit the production of mRNA, resulting in a feedback that regulates gene expression. Using m and p to denote the amounts of mRNA and protein in a cell $\left(\times 10^{2} \text { copies } / \mathrm{cell}\right),$ a simple model of gene regulation is

$$\begin{array}{l} {d m / d t=1-p-m} \\ {d p / d t=m-p} \end{array}$$

Construct the phase plane, including the nullclines.