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A residential heat pump with a coefficient of performance of 2.2 delivers energy to the dwelling at a rate of 23 kW. Determine the net power required to operate the heat pump, in kW.
Is there sufficient evidence to indicate that customers are left on hold for an average length of time greater than 22 seconds? Use a 5% level of significance.
Heat transfer from a certain stationary system occurs at a rate of 10 kW. If the system performs work at a rate of 27 kW. What is the time rate of change of energy within the system in kW?
A biologist has found that 40% of all brown bears are infected with trichinosis. 10 brown bears are tested for trichinosis.
The correlation between GPA and number of Facebook friends is -0.686. Use the correlation and signficance level of 5% to test for a negative linear association between GPA and number of Facebook fri
Determine (a) Compression Ratio. (b) p,V and T at four corners (c) Entropy change during heat addition (d) Work cycle (e) Heat rejection (f) Power of engine (g) sketch p-V and T-s diagram?
A university dean wishes to estimate the average number of hours that freshmen study each week. The standard deviation from a previous study is 2.6 hours. How large a sample must be selected if he w
The cylinder volume is 2000 cm^3 before compression, and the intake air is at 100kpa and 30Centigrade. If the heat addition is 900 kj/kg. Determine (a) Work cycle or power (b) Heat rejected?
An irate student complained that the cost of textbooks was too high. he randomly surveyed 36 other students and found that the mean amount of money spent for textbooks was 121.60. If the standard d
A manufacturer of computer hard drives claims a failure rate of 5% or less during the first three years of operation. For a sample of 100 drives, 9 failed during the first three years of operation.
In a sample of 1000 voters, 520 plan to vote for candidate A. Find the 95% confidence interval for the percent in favor of candidate A
What is the spring rate? What is the distance between the hook ends if the spring is extended until the stress just reaches the yield strength?
Determine the specific volume by using the principle of corresponding states. Determine the density of refrigerant- 12 at 3 MPa and 200 celsius by using the principle of corresponding states.
Compute a 95% confidence interval for the difference between the proportions of farmers favoring the program in Tippecanoe County and in Benton County. Do you think opinions differed in the two coun
Find the 95% confidence interval for your prediction
Calculate the true minor and major strains and the engineering minor and major strains of a circle. The original diameter was 5mm the length is now 7.2mm the width is 4.1mm.
For each case, devise and evaluate an exergetic efficiency. Compare calculated efficiency values and comment. Stray heat transfer and the effects of motion and gravity are negligible.
What conditions must be met before constructing a confidence interval for a proportion? Be sure to be specific with regard to whether you use p or p-hat in your check.
If the exit temperature of hot air is 30 deg C determine the exit temperature of cold water. (use constant specific heats at room temperature.)
The lengths of pregnancies are normally distributed with a mean of 266 days and a standard deviation of 15 days. Find the probability of a pregnancy lasting 307 days or longer
Certain organic contaminants in soil can be driven out using hot air and steam. If 30.0 m3 air (partial pressure of steam 4.24 kPa) at 100 degree C.
The potential energy change from inlet to exit is negligible. For steady-state operation, determine the exit temperature, in R, the exit pressure, in psia and the mass flow rate, in lbm/s.
The steam enters at 300 degreeC with a velocity of 25 m/s and exits as saturated vapor at 0.05 bar with a velocity of 90 m/s. Neglecting potential energy effects, determine the inlet pressure, in ba
Heat transfer from the compressor to its surroundings occurs at a rate of 20.5 Btu per lb of air flowing. Determine the compressor power, in hp, for steady-state operation.
The links have an angular acceleration and an angular velocity of 6 rad/s2 and 3 rad/s, respectively. For this instant calculate the magnitudes of the force F and torque M suppored by the pin at E.