Written Assignment 2

Answer all of the following questions. Do not send in a partially completed assignment. Answer each question as completely as possible, but do not merely copy answers from your reading materials. If you cite a reference in the text, explain the meaning of the citation.
Find the resistance of a light bulb that is connected to a 120-volt line and has a current of 0.5 amps flowing through it.
Calculate the electrical power of a lamp that carries 2 amps of current at 120 volts.
A heater uses 20 amps when connected to a 100-volt line. If the electric power costs 10 cents per kilowatt hour, what is the cost of running the heater for 10 hours?
The current through two identical light bulbs connected in a series is 0.25 amps. The voltage across both bulbs is 100 volts. Find the resistance of a single light bulb.
What is the difference between series and parallel circuits? Specify in words and algebraic formula, if possible, the relationships between current, voltage, and resistance in each type of circuit.
Define the following terms:
Magnetic field
Electromagnet
Magnetic poles
Magnetic force
Describe in detail the effects of a magnetic field on a current-carrying wire.

Writer’s Choice

Directions:
Go to the Hydrostatic Pressure Simulator Links to an external site.https://phet.colorado.edu/en/simulation/under-pressure
Click the BIG RED 5
Explore the simulator by moving the pressure gauge to find out how pressure changes in air and water.
Describe your findings and include specific data from your explorations to support your ideas.
Add another gauge to compare the pressure at sea level to the bottom of the pool.
Is this consistent with your previous observations ?
How would your values compare if this pool of water was at a higher elevation in Denver? To answer this question, try dropping gravity a bit and notice what happens. Can you explain your results?
Restore g to 9.8. Turn the atmosphere off and compare the pressure at sea level to the bottom of the pool. Are the values consistent with your data in part 2? If not, explain why they have changed.
How does the shape of the pool affect pressure at the bottom? Try the “slanty” pools. Explain your findings.
How does the density of the fluid affect the pressure at the bottom? Explain what you did to answer this question.
Now try a quick experiment. Fill the pool and shut off the atmosphere.
Measure the pressure of the water at a depth of 1 meter, 2 meters and 3 meters. Explain any patterns.
Put the gauge at a depth of exactly 1 meter (it should read 9.8 kPa). Now change gravity to 4.9 m/s/s and then 19.6. Explain any patterns.
Put the gauge at a depth of 1 meter and set gravity back to 9.8. Change the fluid density to 700 kg/m3 and 1400 kg/m3. Explain any patterns.
Summarize the previous experiments by stating what factors affect pressure and whether the effects are direct or indirect.
Convert your written summary into an equation ( i.e. P = …..). Test your equation to predict the pressure at the bottom of the rectangular tank of seawater of density 1030. Show all of your work including units.
Create a graph showing this relationship between Pressure and Depth. Is this relationship linear? If so, what is the slope?
Turn air pressure back on. Pick the crazy looking tank with a narrow tube and wide pool. Make sure the water is plain water, on the earth. Put a pressure marker on the bottom of the tank. Drop a 250 kg mass in the hole.
Does the water exert a force on the mass? How do you know?
Did the pressure change? By how much?
Remove the mass. Put a second pressure gauge at a depth of 0.5 meters in the wide pool. Drop the mass in again. Did the pressure change? By how much? Compare this to the pressure change you found above.
What happens to the gauges if you use the 500kg mass instead?
Try dropping the 250 mass again but now observe the water carefully (ruler!) to compare the movement of water in the small tube to the movement of water in the wider pool. Why do you think these amounts are different?
Turn off atmospheric pressure. What happened? Explain your results using past observations.

What safety features that reduce patient radiation exposure can be found on state-of-the-art diagnostic radiographic and fluoroscopic equipment?

Select 8 questions, and answer in paragraph form. Avoid a bullet list but use paragraphs as best as you could.
1. What safety features that reduce patient radiation exposure can be found on state-of-the-art diagnostic radiographic and fluoroscopic equipment?
2. During interventional fluoroscopic procedures, what strategies can be used to manage radiation dose to patients, x-ray equipment operators, and other staff?
3. What are the responsibilities of a radiographer working with a non-radiologist physician, using a C-arm or stationary fluoroscope with HLC mode, while performing an interventional procedure?
4. What results if the x-ray beam and the image receptor are not properly aligned? How can you prevent this error?
5. What characteristics of fluoroscopic equipment are designed for radiation protection?
6. List four factors that are considered when a barrier for a radiographic room is designed.
7. What are the benefits and the consequences of using a radiographic grid when the anatomy to be radiographed is greater than 10 cm?
8. List 3 procedures involving extended fluoroscopic time and why they require longer times
9. Explain how the use of a grid affects radiation dose.
10. Describe scatter radiation

Write a newepaper, magazine, blog, or social media story that could conceivably appear 20, 50, or 100 yeare in the future (say which!), describing something important that has been learned from, or happened, in space since 2022.

1. Compare/contrast the histories of the Soviet and American space programs,
Some of this material is classified still (even the name of the Soviet Chiéf
Designer, Sergei Pavolovich Korolev, was secret until after his 1966 death)
He and Wernher yon Braun on the US side both had many predecessors in the rocket* clubs and in the military, and of course, very many associates and successors (40 points) The third country to launch from its own territory was France in 1965
2. Write a newepaper, magazine, blog, or social media story that could conceivably appear 20, 50, or 100 yeare in the future (say which!), describing something important that has been learned from, or happened, in space since 2022.
Must cite sources