
![(b) Assuming Variable Specific heat method. S= 1.70203 kg legk. Sys 2.64876 15/19 (as) = m [ (5:5). In [A] is (As)2-8962654](http://img.homeworklib.com/questions/414d2700-1af6-11ec-b9c1-e744d3c2925f.png?x-oss-process=image/resize,w_560)
1. A 1.5m rigid container has air at 200kPa and 27°C. It is heated until the...
5. (11 marks total) A well-insulated rigid container is subdivided by a partition into two parts A and B, each of volume V,- = 0.2 m, and each filled with air. The initial temperatures and pressures are P,, = 200 kPa, T.,-100°C, P,-100 kPa, and TB,-20°C. The partition is then removed, and the system comes to equilibrium. (a) (7 marks) Determine the final temperature and pressure in the container (b) (4 marks) Calculate the total entropy change for the air...
Problem 1 [15 pts] Air (R=0.287 kJ/kgK), initially at 300 K and 100 kPa is heated to 450 K in an internally reversible closed system process. You do NOT need to show a system sketch for this problem. Using variable (temperature dependent) specific heats a. Find the specific entropy change (As= S2-S1) of air if the process occurs at constant pressure b. Find the specific entropy change (As= S2-S1) of air if the process occurs at constant volume c. Show...
Ten moles of a gas are placed in a rigid container. Initially the gas is at P=0.5 bar and T= 300 K and the container is also at T= 300K. The container is placed in a furnace, where its surroundings are at a constant T = 600K. The container is left in the furnace until both the container and the gas inside it reach equilibrium with the surroundings. The gas has a constant heat capacity of Cv = 2.5 R....
2. (5 Points) 3-kg of air (an ideal gas) is heated in a piston-cylinder device from 17°C to 117°C at a constant pressure of 100 kPa. Determine the entropy change in kJ/K, assuming: a. Constant specific heat. b. Variable specific heat.
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PROBLEM 4 Ammonia is heated in a closed, rigid container of volume 2 m'. It is initially a saturated vapor at 2°C and heated to a final temperature of 20°C. Determine the following: (a) Initial and final mass of the system of ammonia (b) Specific volume and pressure for initial state (state 1) (c) Specific volume and pressure for final state (state 2) (d) Show states 1 and 2 on a P-v diagram. (Clearly label the...
Water, initially saturated vapor at 11.5 bar, fills a closed, rigid container. The water is heated until its temperature is 200°C. For the water, determine the pressure at the final state, in bar.
Water, initially saturated vapor at 14.1 bar, fills a closed, rigid container. The water is heated until its temperature is 200°C. For the water, determine the pressure at the final state, in bar.
A cylinder fitted with a frictionless piston contains stops
arranged as shown in the following figure. When the piston rests on
the lower stops the volume is 0.4m3 ; when it is in contact with
the upper stops the volume is 0.6m3 . If the piston is not in
contact with the stops, it maintains a constant pressure of 200kPa
in the cylinder. Initially, the cylinder contains air at P1=150kPa
with a temperature of T1=300K. The air is then heated...
A halloon containing air has an initial temperature of 300 K. The baloon is heated and expands a polytropic process wit, n-(-2) until譨hits a rigid spherKal wire cage and can't expand any more. When the balloon first hits the 2 m' wire eage the conditions in the balloon are 1000 K and 200kPa. The heating then continues until finally the temperature in the balloon is 1200 K Wire Cage What is the mass of the air in the balloon?. What...
A constant specific heat ideal gas has a gas constant of 42.92 ft·lbf/(lbm·R) and a constant pressure specific heat of 0.200 Btu/(lbm·R). Determine the heat transferred and the change of total entropy if 9.00 lbm of this gas is heated from 40.0 °F to 340 °F in a rigid container.