QUESTION 45

1. If the labor market flow P_ue is found to equal 0.2 for a particular month, this means that

   		20 percent of the total adult population flowed from unemployment to employment during the month.
   		20 percent of the total labor force flowed from unemployment to employment during the month.
   		20 percent of those who were initially unemployed became employed during the month.
   		20 percent of those who were initially employed became unemployed during the month

2 points   

QUESTION 46

1. Recent estimates suggest that every 1 percentage point decrease in the unemployment rate raises national output by

   		2 percentage points.
   		3 percentage points.
   		5 percentage points.
   		10 percentage points.

2 points   

QUESTION 47

1. More generous unemployment compensation ________ unemployment spells

   		lengthens
   		shortens
   		has no effect on the length of
   		first decreases, then increases

2 points   

QUESTION 48

1. Workers performing dangerous jobs in the economy are typically people that

   		cannot find work offering better conditions.
   		see the jobs as paying well compared to alternative employment.
   		are poorly paid.
   		enjoy danger.

Water is contained in a closed, rigid, 0.2 m³ tank at an initial pressure of 5 bar and a quality of 50%. Heat transfer occurs until the tank contains only saturated vapor. Determine a)the final mass of vapor in the tank, in kg,b) the final pressure, in bar.

0.2 mol of gaseous HCl is added to 1.0 L of a buffer solution that contains 3.0 M CH₃COOH and 3.0 M CH₃COONa. What is the pH of the solution? Assume that K_a for CH₃COOH is 10^-5. Assume also that the volume of the solution does not change when the HCl is added.

Type your answer in decimal number carrying only one digit after decimal. So you must round up or down at the second digit after decimal.

For example, your answer must be like 1.7, 2.3, 3.4, 4.2, 5.8, 6.6, 7.4, etc.

0.5 Kg of air at t1 = 327 ⁰C and the specific volume v1 = 0.2 m³/Kg is enclosed in a cylinder under a piston. The gas slowly expands with no friction to the temperature t2 = 0 ⁰C and the specific volume v2 =0.65 m³/Kg (polytrophic process). Find the work and heat of the process and change in internal energy of gas. Determine the initial and final pressure of the gas. The isentropic exponent and particular gas constant for air are equal to k=1.4 and R=287 J/KgK, respectively.

Determine the Modulus of Elasticity (unit is in GPa) from an aluminium specimen?

Determine the 0.2% Proof Stress for aluminium (in MPa)?

Calculate the Ultimate Tensile Strength (UTS) of aluminium. Given the maximum load of 15800N.

The Ultimate Tensile Strength of cast iron is (in MPa)? Given the max load as 23700N.

using the following data:

) The air in a room with volume 210m3 contains 0.2% carbon dioxide by volume initially. Fresher air with only 0.1% carbon dioxide flows into the room at the rate of 3m3/min and the mixed air flows out at the same rate. Find the percentage of carbon dioxide in the room as a function of time. What is the percentage of carbon dioxide in the room at the end of 30 minutes? What happens in the long run(that is what happens to your function when time t goes to infinity)?

Part 9

If deposits in the banking system are $540, while the reserve ratio is 0.2 and the currency to deposit ratio is 0.09, then:

a) Calculate the total demand for high powered money.

b) Calculate the money multiplier.

(1 mark each for sub-parts a and b (no word count requirement applies) - Part 9 worth 2 marks)

Additional Requirements

1. Honesty pledge that you have completed the Course Experience Survey (CES).

Note: We value your feedback and want to encourage students to provide their feedback especially this semester when things have been so different (e.g. fully online classes, shift to final assessment as assignment instead of exam). Your responses on the CES are confidental, all you need to be to earn 0.5 mark for this is pledge that you have completed the CES. While there is no way we can in fact check this we hope you will be honest and motivated to complete the CES which you can access on Canvas via Student Surveys in the navigation menu.

(0.5 marks)

2. Include a Reference list to acknowledge sources used and cited within your assignment

(1 mark)

A solid disk of mass m₁ = 9.9 kg and radius R = 0.2 m is rotating with a constant angular velocity of ω = 35 rad/s. A thin rectangular rod with mass m₂ = 3.1 kg and length L = 2R = 0.4 m begins at rest above the disk and is dropped on the disk where it begins to spin with the disk.

1)

What is the initial angular momentum of the rod and disk system?

2)

What is the initial rotational energy of the rod and disk system?

3)

What is the final angular velocity of the disk?

4)

What is the final angular momentum of the rod and disk system?

5)

What is the final rotational energy of the rod and disk system?

6)

The rod took t = 6.5 s to accelerate to its final angular speed with the disk. What average torque was exerted on the rod by the disk?

A water pipe tapers down from an initial radius of R₁ = 0.2 m to a final radius of R₂ = 0.09 m. The water flows at a velocity v₁ = 0.86 m/s in the larger section of pipe.

1. What is the volume flow rate of the water?
2. What is the velocity of the water in the smaller section?
3. Using this water supply, how long would it take to fill up a swimming pool with a volume of V = 130 m³? (give your answer in minutes)
4. The water pressure in the center of the larger section of the pipe is P₁ = 243120 Pa. Assume the density of water is 10³ kg/m³. What is the pressure in the center of the smaller section of the pipe?
5. If the pipe was turned vertical and the volume flow rate in the larger section is kept the same, which answers would change?

*the speed of water in the smaller section

*the volume flow rate in the smaller section

*the pressure in the smaller section

A sturdy, sealed container contains 0.2 moles of helium gas. It is initially sitting in a room at 20 °C, and the pressure of the gas is observed to be 200 kPa. The container is then placed in boiling water.

(a) What will the pressure be when the temperature of the gas reaches equilibrium?

(b) What is the change in entropy of the gas during this process?

(c) Is work done on or by the gas? If so, how much?

(d) It heat transferred to or from the gas? If so, how much?