Identify each quantity as either a scalar or a vector. Explain. (a) muzzle velocity of a bullet, (b) price of a company’s stock, (c) air temperature of a room, (d) weight of an automobile, (e) volume of a fish tank, (f ) current of a river.

Determine the number of photons that enter your eye if you look for a tenth of a second at the Sun. What energy is absorbed by your eye during that time, assuming that all the photons are absorbed? The total power output of the Sun is $4.2 \times 10^2 \mathrm{~W}$.

The Rolling Dam on the Blackstone River has a weedy bottom and an average flow rate of $900\ \mathrm{ft}^3 / \mathrm{s}$. Assume the river upstream is $150\ \mathrm{ft}$ wide and slopes at $10\ \mathrm{ft}$ per statute mile. The water depth just upstream of the dam is $7.7\ \mathrm{ft}$. Determine the water depth one mile upstream $(a)$ for the given initial depth, $7.7\ \mathrm{ft}$; and $(b)$ if flashboards on the dam raise this depth to $10.7\ \mathrm{ft}$.

Use the following words to complete this statement: groundwater, runoff, aquifer, recharge zones, withdrawals, permeable. Nearly 20 percent of fresh water is _____, which is stored in the pore spaces of _____ rock called an _____. Precipitation that isn't _____ into may seep into the ground at _____ and replenish the groundwater in an aquifer. Groundwater _____ in places like the San Joaquin Valley in California have cause the ground to sink.

Using the stratigraphic section and photographs located in the textbook (Chapter 7 Irivestigation), determine the possible errvironments of deposition for the lower basal conglomerate.

A. river system

B. sand durnes

C. plant-rich swamp

D. coral reef

E. muddy part of ocean

The Home Depot$^{\circledR}$ recently sold $23$-watt CFL bulbs for $\$2.50$ each and $42$-watt CFL bulbs for $\$8.25$ each. If River Memorial Hospital purchased $200$ such bulbs for a total of $\$1305$, how many of each type did they purchase?

Most of the nonpoint-source pollution in Oregon's Willamette River in 2000 was from the high-tech industry. Research the issue. How are policy makers and stakeholders addressing this problem?

Using p and q below, write the symbolic statement in words. p : Points X, Y, and Z are collinear. q : Points X, Y, and Z lie on the same line. $\sim q \rightarrow \sim p$

Due to momentum considerations, pair annihilation cannot result in the emission of how many photons: (a) one, (b) two, (c) three, or (d) four?

Decide whether the italicized vocabulary word has been used correctly in the sentence. On the answer line, write Correct for correct use and Incorrect for incorrect use.

Before the Aswan Dam was built, the Nile River habitually inundated its banks each spring. ____________________

How is the irony of the necklace symbolic of a larger irony in Mathilde's life? Explain, citing examples from the story.

In Exercises, use a symbolic differentiation utility to analyze the graph of the function. Label any extrema and/or asymptotes that exist.

$f(x)=\frac{x^2}{x^2-1}$

The human body has a surface area of approximately $1.8 \mathrm{m}^{2}$, a surface temperature of approximately $30^{\circ} \mathrm{C}$, and a typical emissivity at infrared wavelengths of e = 0.97. If we make the approximation that all photons are emitted at the wavelength of peak intensity, how many photons per second does the body emit?

Calls for a Fire Company The number of fire calls the Conestoga Valley Fire Company receives per day is distributed as follows:

$$\begin{array}{l|ccccc} \textbf{Number} \boldsymbol{X} & 5 & 6 & 7 & 8 & 9 \\ \hline \textbf{Probability} \boldsymbol{P}(\boldsymbol{X}) & 0.28 & 0.32 & 0.09 & 0.21 & 0.10 \end{array}$$

Construct a graph for the data.