A 5.00-mW laser pointer has a beam diameter of $2.00 \mathrm{~mm}$. a) What is the root-mean-square value of the electric field in this laser beam? b) Calculate the total electromagnetic energy in $1.00 \mathrm{~m}$ of this laser beam.

Identify the membership of the Board of Governors and the FOMC.

Determine whether the statement is true or false. If $Q$ is the standard matrix of an orthogonal linear operator $T$ on $R^2$ and $\det Q=-1$, then $T$ is a rotation.

Anaerobic glycolysis can supply energy to muscle tissue for ________.

Kai needed to cut 25 inches from a long board. He accidently cut 24 inches from the board. What is his percent error? Explain.

A target in a shooting gallery consists of a vertical square wooden board, $0.250 \mathrm{~m}$ on a side and with mass $0.750 \mathrm{~kg}$, that pivots on a horizontal axis along its top edge. The board is struck faceon at its center by a bullet with mass $1.90 \mathrm{~g}$ that is traveling at $360 \mathrm{~m} / \mathrm{s}$ and that remains embedded in the board. $(a)$ What is the angular speed of the board just after the bullet's impact? $(b)$ What maximum height above the equilibrium position does the center of the board reach before starting to swing down again? $(c)$ What minimum bullet speed would be required for the board to swing all the way over after impact?

Classify the following as mixtures or pure substances.

d. the distilled water you use in your iron so it won’t get clogged

Suppose that you give the NAEP test to an SRS of 1000 people from a large population in which the scores have mean 280 and standard deviation $\sigma=60$. The mean $\bar{x}$ of the 1000 scores will vary if you take repeated samples.

According to the 68-95-99.7 rule, about 95% of all the values of $\bar{x}$ fall within ______ of the mean of this curve. What is the missing number? Call it m for "margin of error." Shade the region from the mean minus m to the mean plus m on the axis of your sketch, as in Figure 10.2.

How did Mao use economic policies to try and establish a classless society?

Why is it often very difficult for supervisors, in any culture, to give employees a negative performance appraisal?

A circular target is attached to a rectangular board. The radius of the circle is $4 \frac{1}{2}$ inches, and the measurements of the board are 12 inches by 15 inches. What percent of the board is covered by the target? (The area of a circle is $A=\pi r^{2}$, where r is the radius of the circle.)

Last year you looked at all the financial firms that had stock growth funds. You picked the growth fund that had the best performance last year (ranking at the 99th percentile on performance) and invested all your money in it this year. This year, with its new investments, it ranked only at the 65th percentile on performance. Your friend suggests that its stock picker became complacent or was burned out. Can you give another explanation?

Answer the following question to test your understanding of the preceding section:
How does excitation–contraction coupling in cardiac muscle resemble that of skeletal muscle? How is it different?

The system shown in the figure consists of a uniform (homogeneous) rectangular board that is resting on two identical rotating cylinders. The two cylinders rotate in opposite directions at equal angular velocities. Initially, the board is placed perfectly symmetrically relative to the center point between the two cylinders. Is this an equilibrium position for the board? If yes, is it in stable or unstable equilibrium? What happens if the board is given a very slight displacement out of the initial position ?