Determine entropy change from initial state to final state
A constant-volume tank contains 10 lbm of ammonia initially at 30 lbf/in^2 and 80(deg)F (539.67(deg)R). The ammonia is then cooled until its pressure drops to 10 lbf/in^2. Determine its entropy change from the initial state to the final state.
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What minimum coefficient of friction is necessary between the wall and the riders in order for there to be no tendency to slide down the wall?
A solid aluminium sphere of emissivityε is initially at an elevated temperature and is cooled by placing it in chamber. The walls of the chamber are maintained at a lower temperature and a cold gas is circulated through the chamber.
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Determine the total electrical work the heat pump can consume on that day. If the heat pump consumes 6.6kW of power while operating, how long the heat pump ran on that day?
The ammonia is then cooled until its pressure drops to 10 lbf/in^2. Determine its entropy change from the initial state to the final state.
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Assume that the paired data came from a population that is normally distributed. Using a 0.05 significance level find the mean value of the differences d for the paired sample data, the standard deviation of the differences d for the paried sample
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A Brayton cycle produces 14 MW with an inlet state of 17oC, 100 kPa, and a compression ratio of 16:1. The heat added in the combustion is 960 kJ/kg. What are the highest temperature and the mass flow rate of air, assuming cold air properties?
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