Physics Energy

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  1. If a population grows at the rate of 2% per year, in how many years will it approximately double?
  2. A big coal digger is moving an average of 23 tons of subbituminous Wyoming coal per minute into dump trucks. This coal has an energy content of 10,750 Btu/lb. How many gigawatts (GW) of power does this flow of coal represent?
  3. Suppose 2 large tankers containing liquefied natural gas (LNG) leave a gas export terminal every day. The methane is stored in liquid form in the tankers, at -260°F, in a volume 600 times smaller than would be needed in gas form, at STP (Standard Temperature and Pressure: 0°C temperature, 1 atm pressure). Suppose the average tanker at this port carries an amount of LNG equivalent to 118 million cubic meters of methane at STP. The energy content of methane is 38.5 MJ per cubic meter at STP. How many gigawatts (GW) of power does this daily flow of natural gas through the port represent?
  4. Consider a heat engine that has an exhaust temperature of 227 degrees Celsius. If the Carnot efficiency for this engine is 34%, what is its high temperature (in degrees Celsius)?
  5. Suppose a region has been sprinkled with Cs-137 by a nuclear accident, and the radiation from the soil from Cs-137 is 581 times the normal background radiation. After waiting for 120.7 years, what would be the ratio of this Cs-137 radiation to the normal background radiation? The half-life of Cs-137 is 30.17 years.
  6. Suppose a bicyclist is burning 49 Calories per mile traveled. Convert this rate of energy use to a number of “miles per gallon of gasoline equivalent,” by comparing this to the caloric content of one U.S. gallon of gasoline (132 MJ). (This is similar to the number of miles per gallon of, e.g., olive oil, because gasoline and vegetable oils have similar mass density (~0.72 g/cc vs. ~0.9 g/cc) and caloric density (~11.6 Cal/g vs. ~9 Cal/g).)

Sample Solution

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Celebrations in Spanish-speaking countries

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Keeping in theme with the topic of celebrations in Spanish-speaking countries, your assignment is to explore one celebration that you have never heard about in a Spanish-speaking country. Día de los Muertos is excluded as most have heard about it. Please respond to the following questions:

What is the celebration/festival? When did it originate? What is its purpose?
Who participates? Where does it take place?
How is this festival celebrated? (What does it look and feel like to be there among the participants?)
Why did this celebration get your attention and would you like to participate in it? Why?
Think about a celebration or holiday you celebrate here in the US and compare and contrast how and why your celebration is similar and/or different than the celebration you are presenting.
Please post some images, sounds or video of people, places and food related to your celebration.

Initial post 250 words by Thursday 11:55 pm

Using third-party material: If you use other people’s words, academic research requires us to cite our sources. At the bottom of your forum post, include the links to the websites used to gather information for your topic. If your sources were not from the web, reference the name and author of any book or article that you consulted. Please remember that text directly quoted from other sources must be in quotation marks.

Please respond to two peers and consider the following:

Post at least two comments and two questions to each peer–using logic, inquiry, and reasoning to further the discussion.
Can you identify any cultural values of the Hispanic populations that celebrate these festivals?

Sample Solution

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PICOT question for Infection Control nurse

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Are nurses (P) working in ER or ICU (I) compared to nurses working in other units (C) at higher risk of contracting the Coronavirus (O) over a 2-month period (T)?

Sample Solution

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Portfolio homework

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Describe which essays you are including and why you chose these as examples of your best writing.
Describe which learning outcomes are demonstrated in your writing samples:
Identify the purpose and significance of articles
Write outlines, drafts, and revisions
Compose essays that have correct grammar
Pose substantive questions
Identify reliable sources
Evaluate sources for timeliness and bias
Use MLA in-text citations and Works Cited pages
Describe how writing contributes to a life of significance and worth

Sample Solution

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