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

Q: A 5-cm-external-diameter, 10-m-long hot water pipe at 80°C is losing heat to the surrounding air at…

A:

Q: Stainless-steel ball bearings (ρ = 8085 kg/m3 and cp = 0.480 kJ/kg·°C) having a diameter of 1.8 cm…

A: The data given is, The density of steel balls, ρ = 8085 kg/m3 Specific heat of balls, Cp = 0.480…

Q: 5-36 Steam enters a nozzle at 400°C and 800 kPa with a velocity of 10 m/s and leaves at 375°C and…

A:

Q: Submarines change their depth by adding or removing air from rigid ballast tanks, thereby displacing…

A: Given the air and water properties at initial and final.  Required: mass flow rate and heat…

Q: A frictionless piston-cylinder device contains 5 kg of nitrogen at 100 kPa and 250 K. Nitrogen is…

A: Given data:

Q: A vertical piston–cylinder device initially contains 0.12 m3 of helium at 20°C. The mass of the…

A: Write the given data.

Q: An insulated piston-cylinder device contains 0.02 m³ of steam at 300 kPa and 200°C. Steam is now…

A: The initial volume of the steam, (V1)=0.02 m3The initial pressure of the steam, (P1)=300 kPaThe…

Q: Consider a 50-L evacuated rigid bottle that is surrounded by the atmosphere at 95 kPa and 27°C. A…

A: It seems that the question requires the calculation of the net heat transfer but it is not clearly…

Q: A 4-m x 5-m x 6-m room is to be heated by a baseboard resistance heater. It is desired that the…

A:

Q: 8-25 A mass of 8 kg of helium undergoes a process from an initial state of 3 m/kg and 15°C to a…

A: Refer thermodynamic tables, “Molar mass, gas constant and critical point properties”, and obtain the…

Q: Air contained in a variable-load piston-cylinder is initially at 0.1 m3, 22°C, and 100 kPa. The…

A:

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

A: Given: The initial volume of the air is V1=0.40 m3. The final volume of the air is…

Q: A 100-lbm block of a solid material whose specific heat is 0.5 Btu/lbm·R is at 80°F. It is heated…

A: Write the given data: mb=100 lbmcb=0.5 Btu/lbm-°RT1=80 °F=80+460 (°R)=540 °RmW=10 lbmPW=20 psia

Q: A frictionless piston-cylinder device contains 3.6 kg of air at 150 kPa and 300 K. The air is…

A:

Q: An insulated vertical piston–cylinder device initially contains 15 kg of water, 13 kg of which is in…

A: Given Mass of the water 15 kg Vapour mass 13 kg Vapour pressure = 300 kPa Steam pressure = 2 MPa…

Q: A 0.6-m3 rigid tank is filled with saturated liquid water at 135°C. A valve at the bottom of the…

A: Given data as per the question The volume of the gas =0.6 m3 Considering the properties table  of…

Q: in a variable-load

A: FROM QUESTION WE GET THE INFORMATION THAT VOLUME  DOUBLED BUT TEMPERATURE REMAINS CONSTANT HENCE THE…

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

A: Given: The initial volume of the air is V1=0.40 m3. The final volume of the air is V2=V1+50%of…

Q: A cylinder compresses helium (R=0.4968 Btu/lbm-R) isothermally from 14.7 psia and 68F and the…

A:

Q: A frictionless piston–cylinder device contains 10 lbm of steam at 60 psia and 320°F. Heat is now…

A: Given data: mass of steam (m) = 10 lbm Pressure (P) = 60 psia initial Temperature (Ti) = 320oF final…

Q: A 5-ft3 rigid tank initially contains refrigerant-134a at 60 psia and 100 percent quality. The tank…

A: The properties of refrigerant 134a at 60 psia and 100 percent quality are: The enthalpy of…

Q: An autoclave contains 1000 cans of pea soup. It is heated to an overall temperature of 100 °C. If…

A: The calculation has been shown in the step-2.

Q: Consider the insulated piston-cylinder device shown in the figure below. The cylinder has a piston…

A: (a) To find: The final temperature.  Given: The initial volume is V1=0.8 m3. The final volume is…

Q: perheated steam at 0.5 MPa and 400 °C enters an adiabatic nozzle na low velocity and leaves at 0.1…

A:

Q: Heat is lost through a plane wall steadily at a rate of 1500 W. If the inner and outer surface…

A: Given: The rate of heat lost through a plane wall steadily is Q=1500 W. The temperature of the inner…

Q: A room contains 60 kg of air at 100 kPa and 15°C. The room has a 250-W refrigerator (the…

A:

Q: A rigid 1-ft3 vessel contains R-134a originally at –20°F and 27.7 percent quality. The refrigerant…

A: Given data: Refrigerant is R-134a vessel volume (V) = 1 ft3 temperature (T)    = -200F  Quality (q)…

Q: piston-cylinder device c quilibrium, isothermal ex

A: given:mass of argon=4kgwork done by system=15jwork done by paddle wheel=3kj

Q: Steam enters a diffuser at 10 kPa and 60°C with a velocity of 375 m/s and exits as saturated vapor…

A: Given, The inlet pressure of steam, P1=10 kPa The inlet temperature of steam, T1=60 °C The inlet…

Q: Initially, a piston-cylinder device contains 6 kg of superheated steam at 110 kPa and 150°C. The…

A:

Q: Stainless-steel ball bearings (ρ = 8085 kg/m3 and cp = 0.480 kJ/kg·°C) having a diameter of 1.8 cm…

A: Given data: The density of ball, ρ = 8085 kg/m3. The specific heat, cp = 0.480 kJ/kgˑo The diameter…

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.