Two small spheres vibrate up and down the surface of a large tank of water. We observe places in the water where the surface does not vibrate. What are these statements? (a) A hypothesis. (b) A description of a physical phenomenon. (c) A physical law. (d) A physical quantity.

$$-3y=4x+11$$

$$2x+3y=-7$$

What is the frequency of a wave?

What does it mean if the wavelength of a wave is 4.0 m? (a) The wave continues to travel for 4.0 m before stopping. (b) The period of the wave is 4.0 m. (c) The distance between the nearest particles that have identical displacements is 4.0 m.

If you wish to graph the disturbance pattern of a wave on a long string at one clock reading, which two variables should you have on the axes? (a) $y$ and $\lambda$ (b) $y$ and $x$ (c) $y$ and $t$ (d) $T$ and $\lambda$

If you wish to represent one period of a wave on a string, which two variables should you have on the axes? (a) v and T. (b) y and x. (c) y and t. (d) T and $\lambda$.

Escribe la forma apropiada del verbo dormir para cada frase. Tomás, mi hermano mayor, BLANK menos, seis horas al día.

What is pitch?(a) A physical phenomenon (something that occurs in nature or in a laboratory) (b) A physical quantity (c) A unit (d) None of these is correct.

Which mathematical expression represents a cause-effect relationship for a traveling wave:? (a)$f=\lambda v$ (b)$v=f / \lambda$ (c)$\lambda=v / f$

Which of the following choices explains why sound travels faster in water than in air?(a) The wavelength is shorter in water than in air.(b) The frequency is higher in water than in air.(c) The density of water is greater than the density of air.(d) Water molecules are heavier than air molecules.(e) There is a much stronger interaction between liquid water molecules than between air molecules.

What does it mean if the speed of a wave is 300 m/s? (a) Each particle moves at a speed of 300 m/s. (b) The wave disturbance travels 300 m during each second. (c) The wave disturbance travels 300 m for each wavelength. (d) The wave disturbance travels 300 m during each period.

Which mathematical expression represents a cause-effect relationship for a traveling wave? (a) $f=v/\lambda$ (b) $v=\lambda \cdot f$ (c) $\lambda=v/f$

Here are data (in dollars) on taxes collected by the Internal Revenue Service for the years shown between 1992 and 2004:

$$\begin{matrix} \text{Year} & \text{Total Collected (trillions)} & \text{Corporation Income and Profit Tax (billions)} & \text{Tax per Capita}\\ \text{1992} & \text{1.121} & \text{117.9} & \text{4374.38}\\ \text{1993} & \text{1.177} & \text{131.5} & \text{4543.33}\\ \text{1994} & \text{1.276} & \text{154.2} & \text{4878.00}\\ \text{1995} & \text{1.376} & \text{174.4} & \text{4878.00}\\ \text{1996} & \text{1.478} & \text{189.1} & \text{5586.00}\\ \text{2000} & \text{2.097} & \text{235.7} & \text{7405.00}\\ \text{2001} & \text{1.129} & \text{186.7} & \text{7449.00}\\ \text{2004} & \text{2.019} & \text{230.6} & \text{6851.00}\\ \end{matrix}$$

Compute the mean and standard deviation for: (a) Total collected. (b) Corporation taxes. (c) Per capita tax.

Define sexual activity.