During an isothermal process, at 900F, the pressure on 9 lb of air drops from 85 psia to 10 psig. For an internally reversible process,

Q2: A mechanically reversible process in closed system for an ideal gas undergoes an adiabatic compression at 1bar from an initial state of x °C to y °C then cooled from y °C to x °C at constant pressure. Calculate w,Q, AU and AH if Cv= 3/2R and Cp=5/2R.

A perfect gas has a value of R=58.8 ft.lb/lb.R and k=1.26. If 20 Btu are added to 5 lb of this gas at constant volume when the initial temperature is 90° F, find (a) ∆U and (b) work for a nonflow process.

volumeandpressure of 3 ft³ and 200 psia, respectively, undergoes a frictionless process Hmeandpressure of 3 ft° and 200 psia, respectively, undergoes a frictionless process during which theproduct pV1.* remains constant. How much work is done on a gas, if a certain fluid in a closed system initially having a

Solve correctly please.

A cylinder-piston apparatus contains 29 kg of air at 30°C. Weights on the piston fix the initial pressure at 20 bar. Find the work done if: a. Some of the weights are quickly removed until external pressure is 5 bar. The temperature remains constant. b. Some of the weights are slowly removed until the external pressure reaches 5 bar. The temperature remains constant. c. The expansion from 20 bar to 5 bar is polytropic, with an exponent of 1.4. Note that if the gas is ideal and PV = constant, then the temperature varies as: T₂ Tv 1-n P. n-1

Either solve all parts or leave it unsolved ... I vll upvote

I need the answer quickly