vb.net barcode freeware The First Law and Other Basic Concepts in Software

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CHAPTER 2 The First Law and Other Basic Concepts
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calculated by Eq (211), U = H - P V In this way tables of thermodynamic properties are compiled over the entire useful range of conditions The most widely used such tabulation is for H 2 0 and is known as the steam tables1 The enthalpy may be taken as zero for some other state than liquid at 27315 K (0 C) The choice is arbitrary The equations of thermodynamics, such as Eqs (232) and (233), apply to changes of state, for which the enthalpy differences are independent of the location of the zero point However, once an arbitrary zero point is selected for the enthalpy, an arbitrary choice cannot be made for the internal energy, for values of internal energy are then calculable from the enthalpy by Eq (211)
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lostearn tables are given in App F Tables for various other substances are found in the literature A discussion of compilations of thermodynamic properties appears in Chap 6
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212 Mass and Energy Balances for Open Systems
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CHAPTER 2 The First Law and Other Basic Concepts
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21 A nonconducting container filled with 25 kg of water at 29315 K (20 C) is fitted with
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a stirrer, which is made to turn by gravity acting on a weight of mass 35 kg The weight falls slowly through a distance of 5 m in driving the stirrer Assuming that all work done on the weight is transferred to the water and that the local acceleration of gravity is 98 m sp2,determine: (a) The amount of work done on the water (6) The internal-energy change of the water ( c ) The final temperature of the water, for which C p = 418 kJ kg-' 'C-' ( d ) The amount of heat that must be removed from the water to return it to its initial temperature (e) The total energy change of the universe because of (1) the process of lowering the weight, (2) the process of cooling the water back to its initial temperature, and (3) both processes together
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22 Rework Prob 21 for an insulated container that changes in temperature along with the water and has a heat capacity equivalent to 5 kg of water Work the problem with: (a) The water and container as the system; (b) The water alone as the system 23 An egg, initially at rest, is dropped onto a concrete surface and breaks With the egg treated as the system, ( a ) What is the sign of W (b) What is the sign of A Ep (c) What is AEK ( d ) What is AU' ( e ) What is the sign of Q In modeling this process, assume the passage of sufficient time for the broken egg to return to its initial temperature What is the origin of the heat transfer of part (e) 24 An electric motor under steady load draws 97 amperes at 110 volts, delivering 093 kW of mechanical energy What is the rate of heat transfer from the motor, in kW
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25 One mole of gas in a closed system undergoes a four-step thermodynamic cycle Use the data given in the following table to determine numerical values for the missing quantities, ie, "fill in the blanks"
Step 12 23 34 41 12341 AUtlJ -200
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26 Comment on the feasibility of cooling your kitchen in the summer by opening the door to the electrically powered refrigerator 27 A renowned laboratory reports quadruple-point coordinates of 102 Mbar and 29725 K (241 C) for four-phase equilibrium of allotropic solid forms of the exotic chemical 8-miasmone Evaluate the claim 28 A closed, nonreactive system contains species 1 and 2 in vaporlliquid equilibrium Species 2 is a very light gas, essentially insoluble in the liquid phase The vapor phase contains both species 1 and 2 Some additional moles of species 2 are added to the system, which is then restored to its initial T and P As a result of the process, does the total number of moles of liquid increase, decrease, or remain unchanged 29 A system comprised of chloroform, 1,4-dioxane, and ethanol exists as a two-phase vaporlliquid system at 32315 K (50 C) and 55 kPa It is found, after the addition of some pure ethanol, that the system can be returned to two-phase equilibrium at the initial T and P In what respect has the system changed, and in what respect has it not changed 210 For the system described in Pb 29: (a) How many phase-rule variables in addition to T and P must be chosen so as to fix the compositions of both phases (b) If the temperature and pressure are to remain the same, can the overall composition of the system be changed (by adding or removing material) without affecting the compositions of the liquid and vapor phases 211 A tank containing 20 kg of water at 29315 K (20 C) is fitted with a stirrer that delivers work to the water at the rate of 025 kW How long does it take for the temperature of the water to rise to 30315 K (30 C) if no heat is lost from the water For water, C p = 418 k~ kg-' "c-' 212 Heat in the amount of 75 kJ is added to a closed system while its internal energy decreases by 12 kJ How much energy is transferred as work For a process causing the same change of state but for which the work is zero, how much heat is transferred 213 A steel casting weighing 2 kg has an initial temperature of 77315 K (500 C); 40 kg of water initially at 29815 K (25 C) is contained in a perfectly insulated steel tank
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