PROBLEM 2. A closed system of constant volume experiences a temperature rise of 25°C when a certain paddle work is introduced. The heat transferred in the process is 30 KJ. The specific heat at constant volume for the pure substance comprising the KJ system is 1.2 and the system contains 2.5 kg of this substance. Determine: kg K a. the change in internal energy b. work done ç. paddlę work

PROBLEM 2. A closed system of constant volume experiences a temperature rise of 25°C when a certain paddle work is introduced. The heat transferred in the process is 30 KJ. The specific heat at constant volume for the pure substance comprising the KJ system is 1.2 and the system contains 2.5 kg of this substance. Determine: kg K a. the change in internal energy b. work done ç. paddlę work

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter1: Heat, Temperature, And Pressure

Section: Chapter Questions

Problem 6RQ: One British thermal unit will raise the temperature of _____ 1b of water _____F.

See similar textbooks

Similar questions

A piston-cylinder arrangement contains water at 110°C, 85% quality with a volume of 1 L. What is the initial mass, in grams? The system is heated, causing the 150-mm-diameter piston to rise and encounter a linear spring with k = 800 kN/m. Calculate the specific internal energy (kJ/kg) at this instant knowing that the measured volume is 1.65 L. The heating continues and compresses the spring in the process. When the piston encounters the stops, the pressure is 200 kPa. What is the temperature (in °C) and entropy (in J/K) at this point? Heating continues until the pressure reached 300 kPa. What is the volume, in L at this instant? Illustrate the process in separate P-v and T-v diagram. Note:1000 L = 1m3. Hint: Draw the FBD of the piston in each state.
A change in temperature of 50o C is equal to a change of ___.
A piston-cylinder arrangement contains water at 112°C, 84% quality with a volume of 0.98 L. What is the initial mass, in grams? The system is then heated, causing the 150-mm-diameter piston to rise and encounter a linear spring with k = 800 kN/m. Calculate the specific internal energy (kJ/kg) at this instant knowing that the measured volume is 1.65 L. The heating continues and compresses the spring in the process. When the piston encounters the stops, the pressure is 200 kPa. What is the temperature (in °C) and entropy (in J/K) at this point? Heating then continues until the pressure reaches 300 kPa. What is the volume, in L, at this instant? Illustrate the complete process in separate P-v and T-v diagrams.
1.The quality of heat is independent of its temperature. We note that the quality of energy means the availability of work. A.(True) B.(Fale)
Differentiate work and heat
Prove that internal energy is the property of the system.
Four kilograms of carbon monoxide (CO) is contained in a rigid tank with a volume of 1 m3. The tank is fitted with a paddle wheel that transfers energy to the CO at a constant rate of 14 W for 1 hour. During the process, the specific internal energy of the carbon monoxide increases by 10 kJ/kg. If no overall changes in kinetic and potential energy occur, determine: a. the specific volume at the final state, in m3/kg b. the energy transfer by work, in kJ. c. the energy transfer by heat transfer, in kJ, and the direction of the heat transfer.
QUESTION 1 In the process of taking a gas from state 'a' to state c along the curved path shown in the image. 85J of heat leaves the system and 55J of work is done on the system. a) determine the change in internal energy, Ea-Ec. b) when the gas is taken along the path cda, the work done by the gas is W=38J. How much heat Q is added to the gas in the process cda? c) if Pa= 2.2Pd, how much work is done by the gas in the process abc?. d) what osvQ for path abc? e) if Ea-Eb=15J, what is Q for the process bc? QUESTION 2 suppose a gas is taken clockwise around the rectangular cycle shown in the image. Starting at b, then to a, to d, to c and returning to b. Using the values given in question 1 above a) describe each leg of the process and then calculate b) the net work during the cycle and d) the net heat during the cycle. e) what percentage of intake heat has turned into usable work i.e how efficient is this "rectangular" cycle ( give as a percentage)
1. A student of mass 50 kg carries a bag weighing 4000g from the ground floor to his class on the first floor that is 900 cm high . The work done by the boy is =
For the process, determine (a) the work, (b) Q, and (c) S.
A gas is compressed from an initial volume of 5.75 LL to a final volume of 1.24 LL by an external pressure of 1.00 barbar . During the compression, the gas releases 125 JJ of heat. What is the change in internal energy of the gas?
A frictionless, freely moving piston-cylinder assembly with a mass of 85 kg and a cross-sectional area of 0.05 m2 is located at an atmospheric pressure of 97 kPa. The initial volume of the piston is 8.9 liters and contains 0.008 kg of air. Then, the volume is halved with the heat transfer from the piston-cylinder assembly to the environment. According to this; a) Calculate the final pressure of the container (kPa) in (bar), and its temperature in (K),b) Boundary work (kj),c) Calculate the amount of heat transfer to the environment (kj).R= 0.287 kj/kg K, g=9.81 m/s 2 (You can use other data from Thermodynamic Tables, Table 17 for air.)