Maximum theoretical coefficient of performance
Consider a refrigerator that keeps its contents at 9 degrees Fahrenheit when the house temperature is 73 degrees Fahrenheit. What is the maximum theoretical coefficient of performance, CP, for this refrigerator?
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A coal-fired electric power plant has an overall efficiency of 33% and an output of 816 megawatts. How many terajoules (trillions of joules) of waste heat does it reject to the environment each day?
Gen is interested in seeing how the money grows. Her mom suggests that she take the money in her piggy bank and deposit it in a local bank paying 8 1/2% interest compounded quarterly.
Two stars with equal areas and emissivities have surface temperatures of 4,888 K and 5,720 K respectively. What is the ratio of the radiation power of the second star to that of the first star?
How firms estimate their cost of capital: The WACC for a firm is 13.00 percent. You know that the firm's cost of debt capital is 10 percent and the cost of equity capital is 20%. What proportion of the firm is financed with debt?
What is the net flow rate of energy (in watts) from the sphere to the vessel? For simplicity, assume the sphere and the vessel are both ideal blackbody radiators, with emissivity e = 1.
Your friend wants to pay off her two debts in a single payment. The first debt is $570 due in 8 months, and hte second is $1,380 due 1 1/2 in years. What will that single payment be if she wants to make it at the end of 1 year given a compound int
Consider a group of 20 molecules with the following speeds: three have speed 1 m/s, four have 6 m/s, five have 9 m/s, and eight have 12 m/s. Determine the rms speed (in m/s) of the molecules in this group at this instant in time.
A multiple-choice test consists of 77 questions with possible answers of a, b, c, d, e. Estimate the probability that with random quessing, the number of correct answers is at least 33.
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