9 7-158 An iron block of unknown mass at 85 C is dropped into an insulated tank that contains 0.02 m3 of water at 20 C. At the same time, a paddle wheel driven by a 200-W motor is activated to stir the water. Thermal equilibrium is established after 10 min with a final temperature of 25 C K. Determine (a) the mass of the iron block and (b) the entropy generated during this process. Final Answers (a) miron 11 kg, (c) a= 0.0503 kJ/K 200 W WATER 20°C Iron 85°C

9 7-158 An iron block of unknown mass at 85 C is dropped into an insulated tank that contains 0.02 m3 of water at 20 C. At the same time, a paddle wheel driven by a 200-W motor is activated to stir the water. Thermal equilibrium is established after 10 min with a final temperature of 25 C K. Determine (a) the mass of the iron block and (b) the entropy generated during this process. Final Answers (a) miron 11 kg, (c) a= 0.0503 kJ/K 200 W WATER 20°C Iron 85°C

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

A piston-cylinder arrangement contains water at 110°C, 87% quality with a volume of 1 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 1.7 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 kJ/kg-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. Hint: Draw the FBD of the piston in each state. wwwwwww D=0.15m H₂O
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 weighted piston (total mass of 16.8 kg), resting on stops in a cylinder (radius of 0.05 m) divides a container into two regions. 0.075 kg of saturated liquid water at 50 °C is contained beneath the piston. The rest of the cylinder and container is evacuated. Heat is applied to the water until the piston is lifted off of the stops and moved a distance (y) of 0.6 m. As the piston reaches the mouth of the cylinder, the hermetic seal is broken and the cylinder contents can now expand to fill the remainder of the evacuated space. At this instant, no additional heat is added to or removed from the system. When the system fully equilibrates, its absolute pressure is measured to be 0.01 MPa. vacuum y (cc) BY-NC-SA Niel Crews. 2013 a) What is the state of the water when the piston begins to rise off of the stops? compressed liquid b) What is the water temperature when the piston reaches the mouth of the cylinder? 61.02432 °C c) What is the final volume of the water (after the seal is broken)?…
Let's consider a closed container. This has a glass sight that allows you to observe the liquid level. The container contains refrigerant 134a at 20 ° C. A dough extraction is carried out from the bottom at a very low rate, the temperature remains constant throughout the process. If the area of the container is 0.05m ^ 2 and after liquid extraction the level drops150 mm, determine the mass of refrigerant that came out. see img
According to experiments, a certain material's specific heat capacity at constant pressure is given by the presented equation (where it was assumed that heat capacity does not vary with temperature).In the equation, Cp is in kJ/kg-K.Determine the change in entropy (in J/K) of 175 g of this material when it is heated from 25 ⁰C to 50 ⁰C.
Nitrogen is contained in a 80L tank and the initial pressure andtemperature is 250 kPa and 200 °C, respectively. Note the ideal gasconstant for nitrogen is 0.2968 kJ/kg K Determine: The mass of the gas in kg. Now, if 0.05 kg of gas leaks out of the tank and in the process thetemperature drops to 33 °C. Find the gage pressure of the gasremaining in the tank in kPa. If the atmospheric pressure is 101.325kPa.
A mass of air (molecular mass equal to28.97 g/mol) at 150 kPa and 27 is contained in africtionless piston-cylinder device. At the initial state,the piston is resting on a pair of stops and the totalvolume of occupied by the air is 400 L. The mass ofthe piston is such that a 350 kPa pressure is neededto move it. The air is now heated until its volumehas doubled. Draw the process on the PV diagram.Determine: (a) the final temperature; (b) the workdone by the air; and (c) the total heat added into thegas. (Hint: you might want to use Table I).
Thermodynamic problem. Determine the work necessary to compress a gas from an initial volume VI=90L to half the initial volume, if it is considered that the pressure varies with the volume according to the following equationp(V) = (350Kpa m3 ) / V - (50 Kpa/m3 ) V
An iron block of unknown mass at 185°F is dropped into an insulated tank that contains 0.8 ft of water at 70°F. At the same time, a paddle wheel driven by a 300-W motor is activated to stir the water. Thermal equilibrium is established after 10 min with a final temperature of 75°F. Use data from the tables. Determine the mass of the irnn block. (You must provide an answer before moving on to the next part.) The mass of the iron block is lbm.
An iron block of unknown mass at 185°F is dropped into an insulated tank that contains 0.8 ft3 of water at 70°F. At the same time, a paddle wheel driven by a 200-W motor is activated to stir the water. Thermal equilibrium is established after 10 min with a final temperature of 75°F. Determine the mass of the iron block.
0.25kg/s of Carbon Dioxide (R = 0.1889 kJ/kg-K, k = 1.289) undergo a certain process in a closesystem from initial volume and temperature of 268cm3 and 134K to a final volume and temperature of 804cm3 and 402K respectively. From the data given, perform necessary analysis in determining the type of process to further solve the following questions as follow:a. Work done by/on the system (kJ/s)b. Change in Entropy (kW/K)c. Heat added/rejected by the system (kJ/s) include also the graph of this problem
. Show that the law of the adiabatic process is given byPV ˠ = constantWhere: (ˠ) is the ratio of specific heat capacities.