a. Explain the operation of thermodynamic systems i.e. open system and closed system with the aid of diagrams and examples.
b. Define the term 'property of a substance' in a thermodynamic system and state the main difference between intensive and extensive properties with examples.
In: Mechanical Engineering
Consider a closed economy with no government, a fixed price level, a fixed interest rate and the following characteristics:
a. What is autonomous expenditure at equilibrium? (2)
b. What is induced expenditure at equilibrium? (2)
Now suppose that investment increases to $50B.
c. What is the new level of Equilibrium GDP? (2)
d. What is the value of the multiplier? (2)
e. Briefly explain the process of convergence in the AE model. (2)
In: Economics
In a closed combustion vessel, propane (C3H8) and air are mixed at equivalence ratio of 1.11, temperature of 298 K, and pressure of 1 bar. The mixture is burned to produce solely CO2, CO, H2O, and N2. The heat rejected from the vessel is 820 MJ/kmol of fuel. What are the final temperature and final pressure of the mixture? Since neither O2 nor H2 is present in the burned gas, dissociation can be neglected.
In: Mechanical Engineering
Consider the AD-AS model for a closed economy. If today’s income decreases, the AD curve will ; the SAS curve will ; and the LAS curve will . Note: For each of the above blanks, fill in one of the following three choices: A. move to the right; B. move to the left; C. stay where it was.
In: Economics
Consider the general equilibrium effects of monetary policy in a closed economy. If M decreases, the IS curve will ; the FE curve will ; and the LM curve will ; and r* will and y* will . Note: For each of the above blanks, fill in one of the following three choices: A. move to the right; B. move to the left; C. stay; D. increase; E. decrease.
In: Economics
Graphite solid is placed in a closed chamber of fixed volume with an initial oxygen pressure of 200 atm and heated to T=1300°C. Assume the graphite is not completely consumed during the subsequent reaction. (a) If the total pressure is held constant, what ratio of carbon dioxide to carbon monoxide is produced by any reactions that occur? (b) If the reaction is allowed to proceed from the initial conditions without allowing any gas in or out, would the chamber pressure increase, decrease, or remain the same? (c) If the chamber is perfectly insulated, would the chamber temperature increase, decrease, or remain the same? (d) How – if at all – would your answers to the previous parts change if all the graphite is consumed?
Cgraphite + 1/2O2(g) à CO(g) ∆G1° = -111,700 – 87.65 T (J/mol)
Cgraphite + O2(g) à CO2(g) ∆G2° = -394,100 – 0.84 T (J/mol)
In: Chemistry
Temporary accounts are closed at what stage of the accounting process?
Multiple Choice
At the time that adjustments are made.
After adjustments are made and before the income statement is prepared.
After the income statement and the statement of retained earnings are prepared, but before the balance sheet is prepared.
As the last journal entries at the end of each accounting year.
In: Accounting
calculate the equilibrium pressure of CO2 in a closed 1 L vessel that contains each of the following samples. Assume that ΔH∘ and ΔS∘ are independent of temperature:
15 g of MgCO3 and 1.0 g of MgO at 25 ∘C
15 g of MgCO3 and 1.0 g of MgO at -40 ∘C
30 g of MgCO3 and 1.0 g of MgO at -40 ∘C
In: Chemistry
In 30% ethanol, a 440 bp closed circular A-form DNA is in a relaxed form (no supercoil). What are the Lk, Tw and Wr values? (Please elaborate)
By transferring the above DNA from 30% ethanol solution to water solution, the structure of this DNA molecule converts from A-form to B-form helix (10 bp/turn) without breaking its backbone. What would the Lk, Tw and Wr be? (Please elaborate)
In: Chemistry
Consider the following information on macroeconomic variables in a closed economy of Winterland (all figures are in billion $):
C=160 + 0.6 YD
I=150
G=150
T=100
In: Economics