Answered: Define the Energy change, Energy at…

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Mechanical Engineering

Define the Energy change, Energy at final state, Energy at initial state?

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

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Forms of Energy

Energy is described as the capability to accomplish a task, like the ability to push a block by applying force on it. It is a quantitative property that is used to accomplish work on an object.

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(e) Any change that a system undergoes from one equilibrium state to another is called a process. What is a process during which the specific volume remains constant?
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A piston/cylinder system with a radius of 1m is filled with 0.75kg water at 50˚C and has an initial piston height of 2m (state 1). Heat was transferred to the system such that the water at state 2 became saturated vapor. Afterward, the piston is locked, and the system is heated to 165˚C (state 3).Given the data above, calculate the work, heat transfer, and height of the piston, and create a p-v diagram for the entirety of the process.
2. A piston-cylinder assembly with stops (see figure) contains 1.54 kg of water initially occupying a volume of 1.25 m at a pressure of 1 bar (State 1). As the water in the assembly is heated, the pressure and temperature in the system remain constant until the piston contacts the stops. In this position (State 2), the quality, x2, is determined to be 92%. Heat continues to be added to the system at a constant volume until the system reaches a pressure of 1.5 bar (State 3). Determine the following quantities: а. X b. V2 (m2) C. W13 (kJ) d. Qu (kJ) e. Plot the results on a P-v diagram, labelling relevant P, T, and v values.
1. A tank containing 250 kg of kerosene is to be heated from 20°C to 40 °C in 15 minutes, using 4 bar steam. The kerosene has a specific heat capacity of 2.0 kJ/kg-°C.over that temperature range. ha at 4.0 bar is 2,108.1 kJ/kg. The tank is well insulated and heat losses are negligible. Determine the rate of heat transfer required and steam flow.
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3. Air is contained within a piston-cylinder assembly The cross sectional area of the piston is 0.01 m². Initially the piston is at 1 bar and 25°C, 10 cm above the base of the cylinder. In this state, the spring exerts no force on the piston. The system is then reversibly heated to 100°C. As the spring is compressed, it exerts a force on the piston according to: F=-kx where k= 50,000 N/m and x is the displacement length from its uncompressed position. Determine the work done. a. -166 J b. -216 J c. 166 J d. 216 J
2.
awuIs 2 kg of air undergoes a power cycle undergocs a power cycle consisting of the following processes: Process 1-2: Constant-temperature expansion from p, = 4 bar, v, = 1 m³ /kg, to p2 = 2 bar, v2 = 2 m3/kg. Process 2-3: Constant-pressure compression to T3 = 696.9 K. Process 3-1: Constant-volume heating to state 1. Assume ideal gas behavior and neglect kinetic and potential energy effects. Show that T; = 1393.7 K and find T Sketch the cycle on a T-v diagram and label the states. Find the work done and heat transferred during cach process to complete this chart: b C. Process W (kJ) Q (kJ) iti 1-2 2-3 3-1 TOTAL Find the thermal efficiency of the cycle. For an energy balance on the entire cycle (1-2-3-1), what should the change in system energy be? Does that hold in this case? Add a Caption Pedro Castaño shared with you > Wednesday • Feb 23, 2022•7:24 PM Adjust IMG_7188 Apple iPhone 12 Pro Max НEIF Wide Camera – 26 mm f1.6 3 MP • 1914 × 1728 • 3.5 MB i
B. 0.5 kg of a nitrogen contained within a piston-cylinder undergoes a constant-pressure process at 4 bar beginning at tn 0,72 m/kg. For the nitrogen as the system, the work is =- 84 kJ. Determine the final volume of the nitrogen, in m.
2) If an ideal gas undergoes a process where the change in enthalpy (Δh) is 424 kJ/kg, and the change in internal energy (ΔU) is 320 kJ/kg, and the gas has Cv = 0.7452 kJ/kgm-K, find the following: a) Specific heat ratio (k) b) Specific heat for constant pressure (Cp) c) Gas constant (R)
Read the question carefully and give me right solution according to the question