A freezer has a coefficient of performance of 2.40. The freezer is to convert 1.80 kg of water at $25.0^{\circ} \mathrm{C}$ to 1.80 kg of ice at $-5.0^{\circ} C$ in one hour. (a) What amount of heat must be removed from the water at $25.0^{\circ} C$ to convert it to ice at $-5.0^{\circ} C$? (b) How much electrical energy is consumed by the freezer during this hour? (c) How much wasted heat is delivered to the room in which the freezer sits?

A certain heat engine operating on a Carnot cycle absorbs 410 J of heat per cycle at its hot reservoir at $135^{\circ} C$ and has a thermal efficiency of 22.0%. (a) How much work does this engine do per cycle? (b) How much heat does the engine waste each cycle? (c) What is the temperature of the cold reservoir? (d) By how much does the engine change the entropy of the world each cycle? (e) What mass of water could this engine pump per cycle from a well 35.0 m deep?

Exercise 2.64 described the survey the Red Lobster Restaurant chain conducts to monitor the performance of individual restaurants. One of the questions asks customers to rate the overall quality of their last visit. The listed responses are Poor (1), Fair (2), Good (3), Very good (4), and Excellent (5). The survey also asks respondents whether their children accompanied them (1= Yes and 2 = No) to the restaurant. Is there sufficient evidence to infer that ratings and whether children accompanied the customer are related?

The following selected accounts appear in Shaw Company's unadjusted trial balance at December 31, 2018, the end of its fiscal year (all accounts have normal balances).

$$\begin{array}{lrlr} \text{ Prepaid advertising }& \$ 1,200 &\text{ Performance obligations }& \$ 5,400 \\ \text{ Wages expense }& 43,800 &\text{ Service fees revenue }& 87,000 \\ \text{ Prepaid insurance }& 3,420 &\text{ Rental income }& 4,900 \\ \end{array}$$

Prepare its adjusting entries at December 3 I. 2018. (1) using the financial statement effects template. and (2) in journal entry form using the following additional information.

1. Prepaid advertising at December 31 is $800.
2. Unpaid and unrecorded wages earned by employees in December are$1,300.
3. Prepaid insurance at December 31 is $2,280.
4. Perfomance obligations represent service fees collected in advance of when the services are provided to customers. Performance obligations at December 31 are$3,000.
5. Rent revenue of$ 1,000 owed by a tenant is not recorded at December 31 .

Performance of stock screeners. Refer to the American Association of Individual Investors (AAII) statistics on stock screeners, Exercise $2.44$ (p. 71). Annualized percentage return on investment (as compared to the Standard & Poor's 500 Index) for 13 randomly selected stock screeners are reproduced in the table. Find the range of the data for the 13 stock screeners. Give the units of measurement for the range.

$9.0$	$-.1$	$-1.6$	$14.6$	$16.0$	$7.7$	$19.9$	$9.8$	$3.2$	$24.8$	$17.6$	$10.7$	$9.1$

(a) Give two original examples of time series data.

(b) Give two original examples of crosssectional data. In each case, identify the unit of observation carefully. If the data are both crosssectional and time series, explain why. Hint: Do not restrict yourself to published data, and consider data describing your own life (e.g., sports performance or financial data). You need not list any data, merely describe them and perhaps show a few typical data values.

A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between $0.12$ and for a condenser pressure of $0.9 \mathrm{MPa}$. The mass flow rate of the refrigerant is $0.05 \mathrm{~kg} / \mathrm{s}$. Show the cycle on a $T$-$s$ diagram with respect to saturation lines. Find $(a)$ the rate of heat removal from the refrigerated space and the power input to the compressor, $(b)$ the rate of heat rejection to the environment, and $(c)$ the coefficient of performance.

Of the 281 players with at least 300 plate appearances in the 2008 Major League Baseball season, Jeff Mathis of the Los Angeles Angels had the lowest batting average ( $0.194)$ and Brad Wilkerson of the Toronto Blue Jays scored the fewest runs (21). Overall, the mean batting average was $0.272$, with a standard deviation of $0.027$, and the mean number of runs scored was $65.0$, with a standard deviation of 23.6. Which PERFORMANCE was worse? Explain, using the methods of this chapter.

Refrigerant 134a is the working fluid in a vaporcompression heat pump that provides 35 kW to heat a dwelling on a day when the outside temperature is below freezing. Saturated vapor enters the compressor at 1.6 bar, and saturated liquid exits the condenser, which operates at 8 bar. Determine for isentropic compression a. the refrigerant mass flow rate, in kg/s. b. the compressor power, in kW. c. the coefficient of performance. Recalculate the quantities in parts (b) and (c) for an isentropic compressor efficiency of 75%.

Performance data for a centrifugal fan of 3-ft diameter tested at 750 rpm are $$ \begin{matrix}\text{Volume flow} & \text{106} & \text{141} & \text{176}\\\mathrm{rate, Q (ft^{3}/s)}\\\text{Static pressure} & \text{0.075} & \text{0.073} & \text{0.064}\\\mathrm{rise, \Delta p (psi)}\\\text{Power output,} & \text{2.75} & \text{3.18} & \text{3.50}\\\mathrm{\scr{P} (hp)}\\\text{Volume flow} & \text{211} & \text{246} & \text{282}\\\mathrm{rate, Q (ft^{3}/s)}\\\text{Static pressure} & \text{0.050} & \text{0.033} & \text{0.016}\\\mathrm{rise, \Delta p (psi)}\\\text{Power output,} & \text{3.51} & \text{3.50} & \text{3.22}\\\mathrm{\scr{P} (hp)}\\\end{matrix} $$ Plot the performance data versus volume flow rate. Calculate static efficiency, and show the curve on the plot. Find the best efficiency point, and specify the fan rating at this point.

The following data pertain to the Waikiki Sands Hotel for the month of March.

$$\begin{array}{lcc} & \textbf{ Flexible Budget March } & \textbf{ Actual Results March } \\ & \textbf{ (in thousands)* } & \textbf{ (in thousands)* } \\ \text{ Banquets and Catering } & \$ 650 & \$ 658 \\ \text{ Restaurants } & 1,800 & 1,794 \\ \text{ Kitchen staff wages } & (85) & (86) \\ \text{ Food } & (690) & (690) \\ \text{ Paper products } & (125) & (122) \\ \text{ Variable overhead } & (75) & (78) \\ \text{ Fixed overhead } & (90) & (93) \end{array}$$

$^*$Numbers without parentheses denote profit; numbers with parentheses denote expenses.

Prepare a March performance report. The report should have six numerical columns with headings analogous. Your performance report should cover only the Food and Beverage Department and the Kitchen. Draw arrows to show the relationships between the numbers in the report. For the year-to-date columns in your report, use the previous data given. You will need to update those figures using the March data given above.

A job-performance evaluation form has these categories: 1=excellent; 2=good; 3=satisfactory; 4=poor; 5=unacceptable. Based on 15 client reviews, one employee had median rating of 4; mode rating of 1. The employee was pleased that most clients had rated her as excellent. The supervisor said improvement was needed because at least half the clients had rated the employee at the poor or unacceptable level. Comment on the different perspectives.

A $1400~\mathrm{kg}$ automobile starts from rest and travels $400 \mathrm{~m}$ during a performance test. The motion of the automobile is defined by the relation $x=4000$ $\ln (\cosh 0.03 t)$, where $x$ and $t$ are expressed in meters and seconds, respectively. The magnitude of the aerodynamic drag is $D=0.35 v^2$, where $D$ and $v$ are expressed in newtons and $\mathrm{m} / \mathrm{s}$, respectively. Determine the power dissipated by the aerodynamic drag when $(a)$ $t=10 \mathrm{~s}$, $(b)$ $t=15 \mathrm{~s}$.

A cylindrical vessel, 28.0 cm in height and 3.00 cm in diameter, is filled with water at 50$\degree$C. The density of water is 0.988 g/cm$^3$ at this temperature. Express the mass of water in the vessel in the following units. kilograms