Explain and illustrate the impacts that the COVID-19 pandemic and horrendous bushfires of 2019/2020 have had on the Australian economy. You will do so by comparing the three main macro-economic indicators –GDP growth, inflation and unemployment – in June 2020 to a point in time prior to the pandemic and bushfires (pre-July 2019), then you will illustrate and explain the impacts using the AD-AS model. Provide references that support your work and submit your slides and a link to your video for marking.

LAB QUESTION

A rotating cylindrical rod of mass m=4 Kg and length l=1 meter is connected to a falling weight of 300 grams with a 2 meters string (Maximum distance covered by the falling weight). The distance from the wound string to the axis of rotation is 300 mm. The time taken by the falling weight to halfway is 2 seconds and to the bottom is 3.7 seconds.

Change of angular momentum in the spinning rod

1. Calculate the angular momentum of the rod at both the points (halfway and bottom).
2. Explain the difference in the angular momentum at two points.

the mass of block A is 80 kg, the mass of block b is 20 kg, and A is connected to B with the cable and pulley system shown. the pulleys rotate freely, and the cable and pulleys have negligible mass. the coefficient of static fricion between A and the horizontal surface is Ms=0.4, and the coefficient of kinetic friction is Mk=0.3.

a) initially, block A is being held stationary and the system is at rest in static equilibrium . Find tension in the cable(answer: 196.2 N)

b) the system is released from rest. show the colfficient of static friection is not large enough to keep block A from sliding.

c) Find the acceleration of block A and the tension in the cable when block A starts sliding ( answers: aA=0.981 m/s^2 and 156.96 N)

The director of publications for a university is in charge of deciding how many programs to print for football games. Based on the data, the director has estimated the following probability distribution for the random variable X= number of programs sold at the university football game:

X 25,000 40,000 55,000 70,000

P(X) 0.1 0.3 0.45 0.15

a)Compute the expected number of program sold at the university football game.

b)Compute the variance of program sold at the university football game.

c) Each program cost $1.25 to print and sells for $3.25. Any programs left unsold at the end of the game are discarded. The director has decided to print ether 55,000 or 70,000. Which of these two options maximizes the expected profit from program?

The director of publications for a university is in charge of deciding how many programs to print for football games. Based on the data, the director has estimated the following probability distribution for the random variable X= number of programs sold at the university football game:

X 25,000 40,000 55,000 70,000

P(X) 0.1 0.3 0.45 0.15

a)Compute the expected number of program sold at the university football game.

b)Compute the variance of program sold at the university football game.

c) Each program cost $1.25 to print and sells for $3.25. Any programs left unsold at the end of the game are discarded. The director has decided to print ether 55,000 or 70,000. Which of these two options maximizes the expected profit from program?

A horseshoe for horseshoe pitching should not weigh less than 2.625 pounds. In a sample of 28 horseshoes. the average weight is 2.48 pounds with a sample standard deviation of 0.3 pounds. We wish to test H0: mu equals 2.625 against HA: mu space less than space 2.625 at alpha space equals space 0.05. You may assume the distribution of weights is approximately normal.

a) Are the hypotheses being tested right-tailed, left-tailed, or two-tailed?

b) Determine the value of the test statistic from the given data. Show your work for partial credit.

c) Determine the critical value (or p-value) for this test.

d) What do you conclude about the average weight of the population of horseshoes?

1. Engine oil (cp = 2100 J/kg-°C) is to be heated from 20 °C to 60 °C at a rate of 0.3 kg/s in a 2-cmdiameter thin-walled copper tube by condensing steam outside at a temperature of 130 °C (hfg = 2174 kJ/kg).

a. For an overall heat transfer coefficient of 650 W/m2 -°C, determine the rate of heat transfer and the length of tube required to achieve it. Determine also the rate of steam condensation, in kgsteam/sec. (Ans: 25.2 kW; 7.0 m)

b. What would the tube length have to be if we wanted to heat the oil to 100 °C in the same 2-cm diameter tube and at the same flow rate? How about heating to 120 °C?

4. The US Navy has operated a 76 Hz ELF radio transmitter to communicate with submarines. Find the wavelength of the radio wave in km. The distance from New York to Los Angeles is 3,944 km. How does the wavelength compare with this distance? (5 pts)

5. To image individual atoms in crystals using electromagnetic waves, you typically want the wavelength of the wave to equal the atomic spacing between atoms; this spacing is about 0.3×10-9 m for many crystals. What would be the frequency of the EM wave needed to image atoms in the crystal? (4 pts)
Would you characterize the wave as (a) visible light, (b) ultra-violet light, (c) x-ray, or (d) gamma-ray? (1 pt)