A 1200-W electric resistance heating element whose diameter is 0.5 cm is immersed in 40 kg of water initially at 20C. Assuming the water container is well-insulated, determine how long it will take for this heater to raise the water temperature to 50C. Also, determine the entropy generated during this process, in kJ/K.

Q: A 45.0 kg flower pot falls from a height of 12.6 m and landing in a pool of water, where the energy…

A: The change in entropy be defined as, ∆S=∆QT           ........1 Where, ΔQ be defined as the change…

Q: As an engineer in an automotive company, you are assigned to design an engine with the highest…

A: The main thermodynamic principle to design the heat engine is the 2nd Law of Thermodynamics. The…

Q: An Otto cycle with a compression ratio of 10.5 begins its compression at 90 kPa and 35C. The maximum…

A:

Q: A Styrofoam cup holding 125 g of hot water at 100°C cools to room temperature, 20.0°C. What is the…

A:

Q: A piston–cylinder device contains air that undergoes a reversible thermodynamic cycle. Initially,…

A: Given:     Find the work and heat transfer for each process. Now,

Q: 0.6 kg of air at STP undergoes a process in which its volume decreases by 10%. During the process,…

A:

Q: A Styrofoam cup holding 135 g of hot water at 1.00 ✕ 102°C cools to room temperature, 27.0°C. What…

A:

Q: 850-W refrigerator with a COP of 3.0 extracts heat from the storage chamber at -200C and exhausts it…

A: 850-W refrigerator with a COP of 3.0 extracts heat from the storage chamber at -200C and exhausts it…

Q: The latent heat of vaporization of water is given approximately by L₁ = -2,400Tc + 2,500,000, where…

A: Solution: We have given that The latent heat of vaporization of water Lv=-2400Tc + 25,00,000 where…

Q: A Carnot engine operates between 296°C and 124°C, absorbing 6.10 x 104 J per cycle at the higher…

A:

Q: A freezer is used to freeze 1.5 L of water completely into ice. The water and the freezer remain at…

A: The expression for change in entropy is, ∆S=QT…

Q: On a hot summer day, 3.73  106 J of heat transfer into a parked car takes place, increasing its…

A: Given:  Heat exchanged, dQ=3.73×106 J Initial temperature, Ti=31.2°C Final temperature, Tf=50.6°C…

Q: The surface of the Sun is approximately at 5700 K, and the temperature of the earth's surface is…

A: The entropy change is the difference between the entropy change in the surface of Earth and entropy…

Q: Two hundred joules of heat are removed from a heat reservoir at a temperature of 200 K. What is the…

A: Given data: The heat removed from a reservoir is: Q = 200 J The temperature at which heat is…

Q: An engineer designs a heat engine using flat-plate solar collectors. The collectors deliver heat at…

A:

Q: One container holds 0.10 kg of water at 80 C and is warmed to 100 C by heating from contact with the…

A:

Q: A freezer is used to freeze 5.0 L of water completely into ice. The water and the freezer remain at…

A: The energy transferred from the water by heat can be obtained asSubstituting the values and solving…

Q: This is a symbolic version of Problem 54. When a metal bar is temporarily connected between a hot…

A: Step 1When there is change in heat Q at constant absolute temperature, then entropy changes asQ is…

Q: The water vapor is initially at 700 KN / m2 with a 0.05 drought fraction through a reversible…

A: It is given that the initial and the final temperature in the process is same, so it is an…

Q: The surface of the Sun is approximately at 5.70 x 103 K , and the temperature of the Earth’s surface…

A:

Q: A brass rod is in thermal contact with a constant-temperature reservoir at 130 C at one end and a…

A: a) The required total change in entropy of the rod is,

Q: Suppose 1.00 kg of water at 100C is placed in thermal contact with 1.00 kg of water at 0C. What is…

A: Given, mass of water m=1.00 kg

Q: An ice tray contains 500 g of water. Calculate the change in entropy of the water as it freezes…

A:

Q: A cylinder-piston system with 700 g of water at 0C is placed in a refrigerator. Water slowly freezes…

A: Given data The mass of the water is mw = 700 g = 0.7 kg The initial temperature of the water is Ti_w…

Q: A heat engine absorbs 2500 J of heat at 250°C and expels 2000 J at a temperature of 50°C. The change…

A: Given, Q1 = 2500 J T1 = 250 C∘ = 250+273.15 = 523.15 K Q2 = 2000 J T2 = 50 C∘ = 50+273.15 = 323.15 K…

Q: If a refrigerator discards 80 J of heat per cycle and its coefficient of performance is 6.0, what…

A: Given, a refrigerator discards heat, QH = 80 J Coefficient of performance, KR = 6.0 the quantity of…

Q: A 49.6 g block of copper whose temperature is 492 K is placed in an insulating box with a 107 g…

A:

Q: A freezer is used to freeze 1.0 L of water completely into ice. The water and the freezer remain at…

A: (a)The mass of the water in 1.0 L is,

Q: A 0.40-m3 insulated piston–cylinder device initially contains 1.3 kg of air at 30°C. At this state,…

A: Concept used: Free expansion leads to entropy change.   Formula used: ∆S=NRlnV2V1 where: ∆S=change…

Q: A Styrofoam cup holding 118 g of hot water at 1.00 x 102°c cools to room temperature, 21.0°C. What…

A: Mass of water m  = 118 g = 0.118 kg The initial temperature of the water Ti = 1.00 × 102  oC = 100…

Q: A person is at rest in an insulated room with an ambient temperature of 19.1°C. The person has a…

A: Temperature of room, Tr = 19.1° C = (19.1 + 273) K = 292.1 K Surface area, A = 1.84 m² Skin…