b) Calculate the energy delivered to the ment at t 10, 30, and 80 ms. %3D
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- 6-25E Solar energy stored in large bodies of water, called solar pounds, is being used to generate electricity. If such a solar power plant has an efficiency of 3 percent and a net power output of 180 kW, determine the average value of the required solar energy collection rate, in Btu/h.a) The efficiency of a particular cyclical heat engine is 41%. If 371 kJ of heat are being transferred into the engine, what is the work output of this engine in kJ? b) How much heat is transferred back into the environment as the engine runs?What is the maximum possible coeffcient of performance of a heat pumpthat brings energy from outdoors at -10:00C into a 25C house?
- A power plant has been proposed that would make use of the temperature gradient in the ocean. The system is to operate between 19.0°C (surface water temperature) and 4.95°C (water temperature at a depth of about 1 km). (a) What is the maximum efficiency of such a system? ?%(b) If the useful power output of the plant is 80.0 MW, how much energy is absorbed per hour? ?J(c) In view of your answer to part (a), do you think such a system is worthwhile (considering that there is no charge for fuel)?How much heat QH does a heat pump with a coefficient of performance of 2.00 deliver when supplied with 4.10 kJ of electricity? Он J1. (a) Calculate the net work output of a heat engine following path ABCDA in the figure below. V WABCDA (b) What is the net work output of a heat engine that follows path ABDA in the figure above, with a straight line from B to D? WABDA = Note: The units on the y-axis are in terms of 106 N/m². The units on the x-axis are in terms of 10-3 m³. = PA (10 N/m²) 2.6 2.0 1.0 0.6 A D 1.0 B C 4.0 V (10-³ m³)
- Suppose a woman does 350 J of work and 9700 J of heat is transferred from her into the environment in the process. a) What is the change in her internal energy, in joules, assuming she does not consume any food? ΔU = b) What is her percent efficiency? η (%) =A(n) 88-kg sprinter accelerates from rest to a speed of 11.0 m/s in 4.2 s. (a) Calculate the mechanical work done by the sprinter during this time. 5324 J (b) Calculate the average power the sprinter must generate. 1267.62 W (c) If the sprinter converts food energy to mechanical energy with an efficiency of 25%, at what average rate is he burning Calories? 5070.48 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. Cal/sThis problem compares the energy output and heat transfer to the environment by two different types of nuclear power stations-one with the normal efficiency of 32.16N%, and another with an improved efficiency of 43.521%). Suppose both have the same heat transfer into the engine in one day, 3.29 x 1014J. a) How much more electrical energy is produced by the more efficient power station? JI b) How much less heat transfer occurs to the environment by the more efficient power station? (One type of more efficient nuclear power station, the gas-cooled reactor, has not been reliable enough to be economically feasible in spite of its greater efficiency.) JI
- In one cycle of an engine, 1.71 k) of energy is absorbed from a hot reservoir at 277°C, and 1.22 kJ of energy is expelled to a cold reservoir at 27.0°C. (a) What is the engine's efficiency? (Enter your answer as a percent.) % (b) How much work (in J) is done by the engine in each cycle? (c) What is the power output (in kW) of the engine each cycle lasts 0.295 s? kWA typical electric refrigerator has a power ratingof 400 W, which is the rate (in J/s) at whichelectrical energy is supplied to do the work neededto remove heat from the refrigerator. If therefrigerator releases heat to the room at a rate of900 W, at what rate (in watts) does it remove heatfrom the inside of the refrigerator?The heat machine receives 1200 J of heat from high-temperature heat source and re lease the heat of 900 Ĵ to low tenperatuve hent sovrce in each Y ound Que sion : Find the of machine if each cycle takes 0.2 S. Angwer a) 60o0 w 67 4500 c) 60 W d) 1500 w F) 240 W 92 180 W