A power plant taps steam superheated by geothermal energy to 558 K (the temperature of the hot reservoir) and uses the steam to do work in turning the turbine of an electric generator. The steam is then converted back into water in a condenser at 305 K (the temperature of the cold reservoir), after which the water is pumped back down into the earth where it is heated again. The output power (work per unit time) of the plant is 125 megawatts. Determine (a) the maximum efficiency (as a decimal number between zero and one) at which this plant can operate and (b) the minimum amount of rejected heat that must be removed from the condenser every twenty-four hours.

Q: Consider the following figure. P( MPa) 10 8. 6. 2 V (m³) 2 4 6 8 10 12 (a) Determine the work done…

A: Work done = Area under the curve in (P-V) coordinates,Work done = A1+A2+A3 = 3*(12-3) +…

Q: The Kingda Ka roller coaster at Six Flags Great Adventure and Safari in New Jersey currently holds…

A:

Q: Please help! Thank you! A 68.4-kg sky diver jumped out of an airplane at an altitude of 0.900 km.…

A: Given Data : The mass of the skydiver is given as m = 68.4 Kg. The height of the skydiver initially…

Q: You observe a grasshopper eating a blade of grass. You know that each blade of grass contains 100…

A: Given that:- Energy contain in one blade of grass=100 units

Q: A crate of fruit with a mass of 31.0 kg and a specific heat capacity of 3600j/(kgxk) slides 8.40m…

A:

Q: A heat engine has a solar collector receiving 600 Btu/h per square foot, inside which a transfer…

A: Transfer medium is heated to 800R and  collected energy power heat is 100F engine deliver heat 8500.…

Q: The energy released from condensation in thunderstorms can be very large. Calculate the energy (in…

A: radius = 2.1 km h = 2.7 cm density of water = 1000 kg/m3

Q: A kettle delivers 2.80 kW of power to 1.45 kg of water. The water is initially at a temperature of…

A: heat require to change the temperature = mc∆T Where c = specific heat heat require to change state =…

Q: Suppose that an engine has 28% overall efficiency. Find how much work is done in a time interval in…

A: The efficiency is defined as the ratio of work done to the input heat.  η = WQin Where, W is the…

Q: A student evaluates a weight loss program by calculating the number of times she would need to climb…

A:

Q: A weightlifter curls a 28 kg bar, raising it each time a distance of 0.55 m.  How many times must…

A:

Q: An underground salt cavern has approximate dimensions of 100m x 500m x 3m. The underground salt…

A:

Q: An engine, operating with an efficiency of 0.225,  delivers 8.10 ✕ 105 J each minute. What is the…

A:

Q: A 1600 kg car steadily accelerates from rest to 60 mi/hr over a 2.8 second time span. How much work…

A: Given:mass of car, m = 1600 kgfinal velocity, vf = 60 mi/hr = 26.816 m/s

Q: I often make tea in my microwave oven. I know that it takes two minutes to bring the temperature of…

A: The efficiency of a device is defined as the ratio of output energy upon the input energy.  Now…

Q: A steam engine delivers 5.4×108 J of work per minute and services 3.6×109J of heat per minute from…

A: Given :W= 5.4 x 108JH= 3.6 x 109J

Q: An object with a large surface area has a mass of 20kg, and falls freely under gravity from a height…

A: Given: The mass of the object is 20 kg. The initial height of the object from the ground is 25 m.…

Q: The energy released from condensation in thunderstorms can be very large. Calculate the energy (in…

A:

Q: An engine burns a liter of fuel each 12 min. The fuel has a specific gravity of 0.8 and a heating…

A:

Q: An assistant for a football team carries a 26.0 kg cooler of water from the top row of the stadium,…

A: We kno that work done  W=Fdcosθ a) F=26*9.81=255.06  angle θ=180 Wok done by the assistant…

Q: As a gasoline engine is running, an amount of gasoline containing 11,100 J of chemical potential…

A: Given Data: The input energy is: Qi=11100 J The output energy is: Qo=3700 J

Q: What is the efficiency of a subject on a treadmill who puts out work at the rate of 100 W while…

A: Given ,Output power = 100 WInput Power = 700 W (table 7.5 intext book)

Q: A PHYS 1510 student was working on a robotics project. The joints on the machine they were building…

A:

Q: You use a quantity of fuel with a total energy content of 19.02 MJ to power an engine. If the…

A: The objective of the question is to calculate the efficiency of an engine given the total energy…

Q: 75%. Calculate the pow air is 1.864 Kg/m³.

A: Given as, d=18 m, v=10ms , η=0.75, ρ=1.864 kgm3 .

Q: A truck mass of m=1210kg drives up an incline at a constant speed of v = 12.7 m/s. The forces of air…

A:

Q: A heat engine extracts 45.0 kJ from the hot reservoir and exhausts 40.0 kJ into the cold reservoir.…

A: The work done by heat engine: W=QH-QC Efficiency η=1-QCQH Given QC=40kJ QH=45kJ

Q: Why do we not use brakes with more than 80% efficiency in automobiles? What should be the minimum…

A: we do not use brakes with more than 80% efficiency in automobiles

Q: A pump rated at 700W is used to transfer water from an open tank at ground level, to another open…

A:

Q: As a gasoline engine is running, an amount of gasoline containing 13,600 J of chemical potential…

A: Given: Input energy, E=13600 J Work done, W=3400 J

Q: In the figure, a 3.2 g ice flake is released from the edge of a hemispherical bowl whose radius ris…

A: Mass, m = 3.2 g Radius, r = h = 19 cm = 0.19 m Initial speed, vi = 0.51 m/s

Q: A weightlifter curls a 26 kg bar, raising it each time a distance of 0.65 m . How many times must he…

A:

Q: An ideal heat engine operates between 177 degree C and 27 degree C. If the engine takes 5*1000000 J…

A:

Q: A graduate student leaves a cylinder of carbon dioxide sitting in the sun. The cylinder absorbs 25.2…

A: Given:Energy absorbed by cylinder = 25.2 JWork done by the piston = 12 J

Q: Energy may be stored for use during peak demand

A: (b) (i) Energy required each night E = mgh = 1.35 X 105 X 9.8 X 135  =  178605000 J = 1.78605 X 108…

Q: Let W = (2.70 ✕ 105 J) ln(Vf /Vi). Solve for the unknown quantity in each of the following cases:…

A: Given, W =(2.70×105 J)lnVfViwe are asked to calculate (a)the work done, given, the final volumeVf is…

Q: Rub your hands together vigorously. What happens? Discuss the energy transfers and transformations…

A: Hands are felt warm when rubbed. When we rub the hands,hands are having kinetic energy .It is the…

Q: A car with mass of 1138 kg accelerates from 0 m/s to 40.0 m/s in 10.0 s. Ingnore air resistance. The…

A: Solution:   Given Values, Mass (m)=1138 Kginitial velocity(u)=0 m/sfinal velocity(v)=40…

Q: b) Energy may be stored for use during peak demand by pumping water to a high reserveir when needed.…

A: Given: The height is h=135 m. The time is t=10 h. The rate is r=1.35X105 kg/s. Part (i) The…

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.