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a) is the energy required to heat air from 295 to 305 K the same as the energy required to heat it from 345 to 355 K? As
Posted: Mon Jul 11, 2022 1:15 pm
by answerhappygod
- A Is The Energy Required To Heat Air From 295 To 305 K The Same As The Energy Required To Heat It From 345 To 355 K As 1 (766.44 KiB) Viewed 30 times
a) is the energy required to heat air from 295 to 305 K the same as the energy required to heat it from 345 to 355 K? Assume the pressure remains constant in both cases. [1 mark] b) What is enthalpy? [1 mark] c) is it possible to compress an ideal gas isothermally in an adiabatic piston-cylinder device? Explain. [2 marks] d) A gas is expanded from an initial volume of 0.3 m³ to a final volume of 1.2 m³. During the quasi-equilibrium process, the pressure changes with volume according to the relation P=a+bV+cV², where a= 1080 kPa, b = -500 kPa/m³ and c = -23 kPa/ (m³)². Calculate the work done during this process by implementing integrations. [4 marks] e) A 1000-W iron with a mass of 0.4155 kg has a specific heat, cp = 875 J/kg°C. Initially, the iron is in thermal equilibrium with the ambient air at 22°C. Determine the minimum time needed for the plate temperature to reach 200°C. [2 marks]