Indicate whether each of the following statements concerning anabolic steroid use is true or false.

a. Illegal anabolic steroid use has very little effect on the performance of female athletes.

b. Use of illegal anabolic steroids affects the male reproductive system.

c. Structurally, testosterone and “Andro” contain the same number of carbon atoms.

d. Structurally, testosterone and THG differ in that all steroid ring attachments are different.

A microphone has an unloaded voltage $v_5=20 \mathrm{mV}$, as shown in Figure . An op amp is available as shown in Figure. It is desired to provide an output voltage of $4 \mathrm{~V}$. Design an inverting circuit and a noninverting circuit and contrast the input resistance at terminals $\mathrm{x}-\mathrm{y}$ seen by the microphone. Which configuration would you recommend to achieve good performance in spite of changes in the microphone resistance $R_5$ ?

A one-sided confidence interval for p can be expressed as $p<\hat{p}+E \text { or } p>\hat{p}-E$, where the margin of error E is modified by replacing $z_{\alpha / 2}$ with $z_{\alpha}$. If Air America wants to report an on-time performance of at least x percent with 95% confidence, construct the appropriate one-sided confidence interval and then find the percent in question. Assume that a simple random sample of 750 flights results in 630 that are on time.

A high-performance aircraft is flying at a Mach number of 1.8 at an altitude of 10,000 m, where the temperature is -44$^{\circ}C$ and the pressure is 30.5 kPa. a. How fast is the aircraft traveling in kilometers per hour? b. The total temperature is an estimate of surface temperature on the aircraft. What is the total temperature under these conditions? c. If the aircraft slows down, at what speed (kilometers per hour) will the Mach number be unity?

Based on a report of a Field poll printed in the Sacramento Bee on July 7, 2000, with the headline, "Ratings Up for Boxer, Feinstein in New Poll.” The results were reported with a graphical display containing the information that "results are based on a statewide survey of 750 adults conducted June 9-18. The sample includes 642 voters considered likely to vote in the Nov. 7 general election. The margin of error is 3.8 percentage points." The report stated that the margin of error was 3.8 percentage points. This value is based on the 642 voters who were considered likely to vote and uses the precise formula.

Compute the conservative margin of error for this poll based on those likely to vote, and compare it to the precise margin of error presented.

Consider a 300 kJ/min refrigeration system that operates on an ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid. The refrigerant enters the compressor as saturated vapor at 140 kPa and is compressed to 800 kPa. Show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the quality of the refrigerant at the end of the throttling process, (b) the coefficient of performance, and (c) the power input to the compressor.

Determine the optimal control signal u for the system $\dot{\mathbf{x}}=\mathbf{A x}+\mathbf{B} u$ defined by

$$\mathbf{A}=\left[\begin{array}{rr}{0} & {1} \\ {0} & {-1}\end{array}\right], \quad \mathbf{B}=\left[\begin{array}{l}{0} \\ {1}\end{array}\right]$$

. Where such that the following performance index is minimized: $J=\int_{0}^{\infty}\left(\mathbf{x}^{T} \mathbf{x}+u^{2}\right) d t$

A gas refrigeration cycle with a pressure ratio of 4 uses helium as the working fluid. The temperature of the helium is $-6^{\circ} \mathrm{C}$ at the compressor ind $50^{\circ} \mathrm{C}$ at the turbine inlet. Assuming isentropic efficiencies of 88 percent for both the turbine and the compressor, determine (a) the minimum temperature in the cycle, (b) the coefficient of performance, and (c) the mass flow rate of the helium for a refrigeration rate of 25 kW.

Because a new employee must learn an assigned task, production will increase with time. Suppose that for the average new employee, the rate of performance is given by

$$\frac{d N}{d t}=\frac{1}{2 \sqrt{t+1}}$$

where $N$ is the number of units completed $t$ hours after beginning a new task. If $2$ units are completed after $3$ hours, how many units are completed after $8$ hours?

A windows air conditioner that consumes of 1 kW of electricity when running and has a coefficient of performance of 3 is placed in the middle of a room and is plugged in. The rate of cooling or heating this air conditioner will provide to the air in the room when running is (a) 3 kJ/s, cooling (b) 1 kJ/s, cooling (c) 0.33 kJ/s, heating (d) 1 kJ/s, heating (e) 3 kJ/s, heating

Refrigerant 134 a enters the compressor of a vapor compression heat pump at $30 \mathrm{lbf} /$ in. $^2, 20^{\circ} \mathrm{F}$ and is compressed adiabatically to $200\ \mathrm{lbf} / \mathrm{in}^2, 160^{\circ} \mathrm{F}$. Liquid enters the expansion valve at $200\ \mathrm{lbf} / \mathrm{in}^2, 120^{\circ} \mathrm{F}$. At the valve exit, the pressure is $30 \mathrm{lbf/in.}^2$ Find

(a) the isentropic compressor efficiency.

(b) the coefficient of performance.

Katie and Kim are attending a theater performance. Katie's seat is at floor level. She looks down at an angle of 18$^{\circ}$ to see the orchestra pit. Kim's seat is in the balcony directly above Katie. Kim looks down at an angle of 42$^{\circ}$ to see the pit. The horizontal distance from Katie's seat to the pit is 46ft. What is the vertical distance between Katie's seat and Kim's seat? Round to the nearest inch.

Performance-based logistics. Refer to the Journal of Business Logistics (Vol. 36, 2015) study of the factors that lead to successful performance-based logistics projects, Exercise $2.45$ (p. 71). Recall that opinions of a sample of Department of Defense (DOD) employees and suppliers were solicited during interviews. Data on years of experience for the 6 commercial suppliers interviewed and the 11 government employees interviewed are listed in the accompanying table. Assume these samples were randomly and independently selected from the populations of DOD employees and commercial suppliers. Consider the following claim: "On average, commercial suppliers of the DOD have less experience than government employees." An XLSTAT printout giving the test results is shown at the bottom of the page. Find and interpret the $p$-value of the test using $\alpha=.05$.

A residential heat pump system operating at a steady state is shown schematically in the given figure. Refrigerant 22 circulates through the components of the system, and property data at the numbered states are given in the figure. The compressor operates adiabatically. Kinetic and potential energy changes are negligible as changes in the pressure of the streams pass through the condenser and evaporator. Find

(a) the power required by the compressor, in $\mathrm{kW}$, and the isentropic compressor efficiency.

(b) the coefficient of performance.