Consider this problem that involves all of the familiar basic processes for a ve

Question

Consider this problem that involves all of the familiar basic processes for a very

simple system. A felt eraser (mass = 200 gm, specific heat = 2.0 kJ/kg-K) at room temperature

(25

Consider this problem that involves all of the familiar basic processes for a very simple system. A felt eraser (mass = 200 gm, specific heat = 2.0 kJ/kg-K) at room temperature (25 degree C) is held 2 meters above the floor in state 1. It is dropped and falls with negligible air resistance to just above the floor at state 2. It impacts the floor and comes to internal equilibrium adiabatically at state 3. It then exchanges heat until it reaches thermal equilibrium with the air at state 4. It then is lifted slowly back to an elevation of 2 meters to complete the cycle. Assume the reference state for energy is at rest on the floor at room temperature. Consider the eraser as a control mass or closed system. Assume that internal energy of the eraser material is a function of temperature only, so that a change in internal energy is given by U_2 - U_1 = mC(T_2 - T_1) Tabulate the extensive energy, kinetic energy, potential energy, internal energy, all in J, and the temperature in degree C at states 1, 2, 3, and 4. Tabulate the heat and work in J for each process 1-2, 2- 3, 3-4, 4-1. Complete the following table so your work can be graded in detail and include enough digits to distinguish the small temperature changes that occur in some of the processes

Explanation / Answer

1 3.92 0 3.92 0 25 0 0 2 3.92 3.92 0 0 25 0 0 3 3.92 0 0 3.92 34.8 3.92 0 4 0 0 0 0 25 0 -3.92

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---