Chapter 7, Problem 7.48P

Need complete answers ASAP... Saturated steam has entropy of 6.65 kJ/kg-K. What are its pressure, temperature, specific volume, and enthalpy?

During a process with air, the entropy increases by 0.55 kJ/(kg·K). The pressure compression ratio is 10 and the initial temperature is 300K.  Find the final temperature assuming a) constant heat capacities and b) variable heat capacities? (Rair = 0.287 and cp = 1.005 kJ/kg·K)

P88#1. a perfect gas has a value of R=58.8 ft.lbf/lbm degree Rankine and K=1.26. if 20 Btu are added to 5lbm of this gas at constant volume when the initial temperature is 90degree farenheit, find (a)T2, (b) enthalphy, (c)entropy, (d)internal energy and (e) work for nonflow process.

Problem 8 Calculate the change in the entropies of the system (AS.99) and the surroundings (ASsur), and the total entropy change (ASotal) when a sample of 1.0 mol of an ideal gas at 300 K and 1.0 bar triples its volume in: a) isothermal reversible expansion b) isothermal expansion against a vacuum (Psurr = 0) c) Will the process in (a) occur spontaneously? What about the process in (b)? Why or why not? %3D

p91#16. 1000CFM of air are compressed at constant tem,perature of 85 degree farenheit and 198psia to 580psia. for both nonflow and steadyflow, compute integral fo pdv, -integral of Vdp, change in entropy and change in enthalpy

Compressible pipe flow with heat addition, , assumesconstant momentum (p + ρV2) and constant mass flow butvariable stagnation enthalpy. Such a flow is often calledRayleigh flow, and a line representing all possible propertychanges on a temperature–entropy chart is called a Rayleighline. Assuming air passing through the flow state p1 =548 kPa, T1 = 588 K, V1 = 266 m/s, and A = 1 m2, draw aRayleigh curve of the flow for a range of velocities fromvery low (Ma << 1) to very high (Ma >> 1). Comment onthe meaning of the maximum-entropy point on this curve.

Draw the p-V and T-s diagram

Thermodynamics need a cancellations of units

Air is expanded from 4 MPa and 1080 K to 100 kPa and 450 K.a) Calculate the air's change in specific entropy (delta s)using constant specific heat capacities at750 K and equations based on cP, cV and the heat capacity ratio k.