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Problem 1 A team of researchers is working on developing a new type of solar energy system for a remote village that experiences abundant sunshine throughout the year. They are testing solar cells with a bandgap energy (εg) of 1.5 eV. Their measurements indicate a dark current density of 1.3x10-9 A/cm² and a short-circuit current density of 4.5x10-2 A/cm² under a solar irradiance of 1500 W/m² at a temperature of 37 °C. To assess the potential of these solar cells for the village's energy needs, the researchers need to determine the following for the test conditions described above: 1. The open circuit voltage and maximum power voltage of the solar cell (30 Points). 2. The maximum power current density for these solar cells (15 Points). 3. The efficiency of the solar cell (15 Points). 4. The total area of solar cells needed to provide 500 watts when operating at maximum power, and the number of cells required if each cell has an area of 250 cm² (15 Points). Constant k/e = 1/ (11,605 K/V).

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If a solution is acidic then the pH could be any of the following values except: Question 4 options: 1 3 5 7

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a unit of time year is defined as 365 days. How many Years are in 1.00 s

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Find the derivative for $y = (3x^2 - 8x)(4x + 3x)$. Do not simplify or expand, just write out the derivative using the Product Rule formula.

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eBook Show Me How Video Question Content Area Income Statement, Statement of stockholders’ equity, and Balance Sheet The amounts of the assets and liabilities of Viva Travel Service as of September 30, 20Y6, the end of the current year, and its revenue and expenses for the year are listed below. The retained earnings were $135,000 and the common stock was $50,000 as of October 1, 20Y5, the beginning of the current year. Dividends of $8,000 were paid during the year. Line Item Description Amount Accounts payable $157,500 Accounts receivable 298,900 Cash 153,600 Common stock 68,000 Fees earned 850,000 Miscellaneous expense 22,500 Rent expense 158,000 Supplies 17,000 Supplies expense 31,800 Taxes expense 31,000 Utilities expense 69,200 Wages expense 420,500 Instructions: Question Content Area 1. Prepare an income statement for the current year ended September 30, 20Y6. Viva Travel Services Income Statement For the Year Ended September 30, 20Y6 Line Item Description Amount Amount $- Select - Operating expenses: $- Select - - Select - - Select - - Select - - Select - - Select - Total operating expenses Total operating expenses $- Select - Question Content Area 2. Prepare a statement of stockholders' equity for the current year ended September 30, 20Y6. If an amount is zero, enter "0". Viva Travel Services Statement of Stockholders' Equity For the Year Ended September 30, 20Y6 Line Item Description Common Stock Retained Earnings Total Balances, Oct. 1, 20Y5 $Balances, Oct. 1, 20Y5 $Balances, Oct. 1, 20Y5 $Balances, Oct. 1, 20Y5 - Select - - Select - - Select - - Select - - Select - - Select - - Select - - Select - - Select - Balances, Sept. 30, 20Y6 $Balances, Sept. 30, 20Y6 $Balances, Sept. 30, 20Y6 $Balances, Sept. 30, 20Y6 Question Content Area 3. Prepare a balance sheet as of September 30, 20Y6. Viva Travel Services Balance Sheet September 30, 20Y6 Line Item Description Amount Amount Assets $- Select - - Select - - Select - Total assets $Total assets Liabilities $- Select - Stockholders' Equity $- Select - - Select - Total stockholders' equity Total stockholders' equity Total liabilities and stockholders' equity $Total liabilities and stockholders' equity

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What is the specific heat of a substance if 25 grams rises in temperature from 10°C to 25°C with the addition of 280 calories of energy? a. 0.0033 cal/(g°C) b. 0.75 cal/(g°C) c. 1.33 cal/(g°C) d. 300 cal/(g°C) e. 833 cal/(g°C)

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In an argument about price gouging, someone makes the argument that limiting price gouging is just because it will allow all buyers to participate freely in the market. Which view of justice is this argument based on? a. Promoting virtue b. Maximizing welfare c. Protecting freedom

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Figure 1 shows a strain gauge mounted on a steel cantilever beam; the gauge factor is 2 and maximum strain output is 500 $\mu \epsilon$. The signal is to be recorded using a 12-bit A/D converter having a 0-10V input range, with the weight displayed in a digital user interface system. a. Describe with neat sketches about the sensor arrangement on the beam and bridge circuit diagram. b. The supply voltage to the Wheatstone bridge could be 1, 3, 6,10 V (selectable), calculate the voltage output from the bridge you used in problem 1.a c. Estimate the percent quantization error in the digital value. d. If the analog signal can be first passed through an amplifier circuit, compute the amplifier gain required to reduce the quantization error to 0.5% or less. e. If the applied force F=0, usually the output voltage after the A/D converter is not equal to zero, give your explanations about the cause of this offset voltage, and give solutions to minimize the influence of this offset voltage. f. With reference to the specifications of strain gauge sensors commercially available, to calculate this system measurement uncertainty at the design-stage?

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A driver traveling on a roadway decides to overtake a slow-moving truck traveling at 15 mph. The accelerating characteristic of the car is given by the following: \frac{dv}{dt} = 2.08 - 0.032v where \textit{v} is the speed (ft/sec), and \textit{t} is the time (sec). (a) What is the acceleration of the car after 3, 7, 10, and 100 seconds? (b) What is the maximum speed attainable by the car? (c) How far will the car travel in 120 seconds?

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10 pts total 1. Draw a reaction coordinate diagram for an exothermic reaction that occurs in 3 steps with the third step being rate limiting. Label the reaction coordinate diagram by indicating the reactant, the intermediate, the transition states and the product. Be sure to include the correct units when appropriate. (6 points). 2. Reaction A has an activation energy of 300 kJ/mol and reaction B has an activation energy of 400 kJ/mol. Which reaction is faster? You must explain your answer to get credit (4 points).

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