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• Q1:4.9 As shown in Fig. P4.9, river water used to irrigate a field is controlled by a gate. When the gate is raised, water flows steadily with a velocity of 75 ft/s through an opening 8 ft by 3 ft. If the gate is raised for 24 hours, determine the volume of water, in gallons, provided for irrigation. Assume the density of river water is 62.3 lb/ft³.See Answer
• Q2:4.13 WP Refrigerant 134a enters the evaporator of a refrigeration system operating at steady state at -4°C and quality of 20% at a velocity of 7 m/s. At the exit, the refrigerant is a saturated vapor at a temperature of -4°C. The evaporator flow channel has constant diameter. If the mass flow rate of the entering refrigerant is 0.1 kg/s, determine a. the diameter of the evaporator flow channel, in cm. b. the velocity at the exit, in m/s.See Answer
• Q3:The aim of this reading assignment is to give you the opportunity to learn about net-zero energy buildings (NZEBs). NZEBS are buildings that produce (at least) as much energy as they con- sume over a one year period. NZEBs integrate various forms of on-site renewable energy gener- ation (e.g., solar, geothermal) with energy efficient building system components (e.g., heat- ing/cooling, lighting, envelopes, electrical appliances). NZEBS are the future of the building sec- tor and are becoming more common. The papers listed below are published in the journal of the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) - the leading international organization for research on high performance buildings. Each paper is a case study on an actual NZEB. PDF copies of each paper are available in Canvas.See Answer
• Q4: An inventor claims to have developed a heat engine that receives 700 k J of heat from a source at 500 K and produces 300 kJ of net work while rejecting the waste heat to a sink at 290 K. Is this a reasonable claim? Why?See Answer
• Q5: 4-20 A piston-cylinder device contains 0.15 kg of air initially at 2 MPa and 350°C. The air is first expanded isothermally to 500 kPa, then compressed polytropically with a polytropic exponent of 1.2 to the initial pressure, and finally compressed at the constant pressure to the initial state. Determine the boundary work for each process and the net work of the cycle.See Answer
• Q6: 13 Water is the working fluid in a Rankine cycle. Steam enters the turbine at 1400 lbf/in² and 1000°F. The condenser pressure is 2 lbf/in? Both the turbine and pump have isentropic efficiencies of 85%. The working fluid has negligible pressure drop in passing through the steam generator. The net power output of the cycle is 1x10° Btu/h. Cooling water experiences a temperature increase from 60°F to 76°F, with negligible pressure drop, as it passes through the condenser. Determine for the cycle o the mass flow rate of steam, in lb/h. the rate of heat transfer, in Btu/h, to the working fluid passing through the steam generator. ) the thermal efficiency. the mass flow rate of cooling water, in lb/h.See Answer
• Q7: 1-21 A pool of volume V (in m') is to be filled with water using a hose of diameter D (in m). If the average discharge velocity is V (in m/s) and the filling time is (in s), obtain a relation for the volume of the pool based on considerations of quantities involved.See Answer
• Q8: 1-18 A 4-kW resistance heater in a water heater runs for3 hours to raise the water temperature to the desired level.Determine the amount of electric energy used in both kW hand kJ.See Answer
• Q9: 1-23E A man goes to a traditional market to buy a steak for dinner. He finds a 12-oz steak (1 lbm = 16 oz) for \$5.50.He then goes to the adjacent international market and finds a300-g steak of identical quality for \$5.20. Which steak is the better buy?See Answer
• Q10: 1-22 The weight of bodies may change somewhat from one location to another as a result of the variation of the gravitational acceleration g with elevation. Accounting for this variation using the relation in Prob. 1-12, determine the weight of an 80-kg person at sea level (z = 0), in Denver (z 1610 m),and on the top of Mount Everest (z = 8848 m).!!See Answer
• Q11: The rocket is in free flight along an elliptical trajectory A – A'. The planet has no atmosphere,and its mass is 0.70 times that of the earth. If the rocket has an apogee (apoapsis) and perigee(periapsis) as shown in the figure, determine the speed of the rocket when it is at these two extreme points (in km/sec). Also calculate the time required to complete one revolution (in hour). See Answer
• Q12: An inventor claims that at steady state the device shown in the figure below develops power from entering and exiting streams of water at a rate of 1638 kW. The accompanying table provides data for inlet 1 and 2 and exit 4. The pressure at exit 3 is 3 bar. Stray heat transfer and kinetic and potential energy effects are negligible. Evaluate the inventor's claim.(Hint: Write the first law first to find the unknown quantities) See Answer
• Q13: Determine the local atmospheric pressure. (Please provide an answer before moving on to the next part.) The local atmospheric pressure is------kPa.See Answer
• Q14: NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.Both a gauge and a manometer are attached to a gas tank to measure its pressure. The reading on the pressure gauge is 80kPa. Determine the distance between the two fluid levels of the manometer if the fluid is mercury (p = 13,600 kg/m). The distance between the two fluid levels ism.See Answer
• Q15: A house is losing heat at a rate of 1500 kJ/h per °C temperature difference between the indoor and the outdoor temperatures. Express the rate of heat loss from this house per K, 'F, and R difference between the indoor and the outdoor temperature. The rate of heat loss from this house per K difference isKJ/h. The rate of heat loss from this house per 'F difference is1kJ/h. The rate of heat loss from this house per R difference is kJ/h.See Answer
• Q16: The absolute pressure is Determine the absolute pressure at the same depth in a different liquid whose specific gravity is 0.85 and that is at the same localatmospheric pressure found in part (a). Determine the absolute pressure at the same depth in a different liquid whose specific gravity is 0.85 and that is at the same localatmospheric pressure found in part (a).See Answer
• Q17: NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.Both a gage and a manometer are attached to a gas tank to measure its pressure. The reading on the pressure gage is 80kPa. Determine the distance between the two fluid levels of the manometer if the fluid is water (p = 1000 kg/m). m.The distance between the two fluid levels isSee Answer
• Q18: 5.5 A 6 kg aluminium plate is removed from a furnace at 40o °C and allowed to cool in air at 15 °C until it reaches equilibrium. What is the increase in entropy of the atmosphere during this process?See Answer

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