The Mars probe Pathfinder is designed to drop the vehicle's instrument package from a height of 20 meters above the Martian surface, after the speed of the probe has been brought to zero by a combination parachute-rocket system at that height. To cushion the landing, giant air bags surround the package. The mass of Mars is $0.1074$ times that of Earth, and the radius of Mars is $0.5282$ that of Earth. Find (b) how long it takes for the instrument package to fall the last 20 meters.

If a wind instrument, such as a tuba, has a fundamental frequency of 32.0 Hz, what are its first three overtones? It is closed at one end. (The overtones of a real tuba are more complex than this example, because it is a tapered tube.)

Each of the following sentences is false. Make each sentence true by replacing the italicized words with vocabulary terms from the Study Gutde.

An instrument that measures wind speed is called a barometer.

An object is 12.0 mm from the objective of a certain compound microscope. The lenses are 300 mm apart, and the intermediate image is 50.0 mm from the eyepiece. What overall magnification is produced by the instrument?

The top of a rectangular table measures $1.245\ \mathrm{m}$ by $0.760\ \mathrm{m}$. (a) The smallest division on the scale of the measurement instrument is (1) $\mathrm{m}$, (2)$\mathrm{cm}$, (3) $\mathrm{mm}$. Why? (b) What is the area of the tabletop?

In listening to a concert, you attend to the solo instrument and perceive the orchestra as accompaniment. This illustrates the organizing principle of a. figure-ground. b. shape constancy. c. grouping. d. depth perception.

By what fraction will the frequencies produced by a wind instrument change when air temperature goes from $10.0^{\circ} \mathrm{C}$ to $30.0^{\circ} \mathrm{C}$ ? That is, find the ratio of the frequencies at those temperatures.

Write $A$ over the verb if the verb is in the active voice and $P$ if it is in the passive voice. Then rewrite each active voice sentence in the passive voice and each passive voice sentence in the active voice.
The trombone players suggested an instrument sale. _____

Use the meanings in the right column to complete the surgical words in the left column.

$$\begin{aligned} &\text{Incomplete Word} & \text{Meaning}\\ &\text{oste/o/ } & \text{instrument to cut bone}\\ \end{aligned}$$

The $\mathrm{A}$ string of a violin is $32$ cm long between fixed points with a fundamental frequency of $440 \mathrm{~Hz}$ and a linear density of $5.5\times10^{-4}$ kg/m. (a) What are the wave speed and tension in the string? (b) What is the length of the tube of a simple wind instrument (say, an organ pipe) closed at one end whose fundamental is also $440 \mathrm{~Hz}$ if the speed of sound is $343$ m/s in air?
(c) What is the frequency of the first overtone of each instrument?

There are 8 students who play the tuba. There are $\frac{1}{2}$ as many students playing the clarinet as the flute. Which expression shows how to find the number of students that play each instrument? How many students play the clarinet?

$$\begin{aligned} & 8+2 f+f \\ & 8+\frac{f}{2}+f \end{aligned}$$

Provide the correct prefix for the following term using the bolded hint.

Electroencephalo______ : record of electrical activity in the brain (EEG); electroencephalo_______ : instrument for recording electrical brain activity; echocardio________ : process of recording the size, motion, and composition of the heart.

Compl$\'e$tez ces phrases pour parler de vous.

Je joue du piano / de la guitare / de la batterie / ???. (Je ne joue pas d’un instrument de musique.)

Two frequencies of sound are played on an instrument governed by the equation $n(t)=8 \cos (20 \pi t) \cos (1,000 \pi t)$. What are the period and frequency of the "fast" and "slow" oscillations? What is the amplitude?