Nats 10

1). An electrical generation system including a generator with an efficiency of 97%, a transmission line with a 92% efficiency, and finally a light bulb with a 40% conversion efficiency. Suppose that instead of coming from coal, the primary energy for the same system is captured by water turbines that have a 93% efficiency, wind turbines that have a 44% efficiency, or solar cells with a 24% efficiency.
1a) Does the full energy conversion sequence using any of these renewable sources make significantly more efficient use of the primary energy available? Explain why or why not.

1b) For non-renewable sources of primary energy, a consequence of lower efficiency is that in order to provide a given amount of useful energy to customers much more primary energy, in the form of raw resources, has to be extracted from the ground. For example, to deliver 1000 MJ of electrical energy using coal requires an input of roughly 3000 MJ of primary energy in the form of coal. What is a similarly practical consequence of lower efficiency for renewable resources like water, wind and solar? In other words, what needs to be done in order to deliver 1000 MJ of electrical energy to customers using water, wind or solar facilities given unavoidable conversion losses? Does it matter? Explain.

Don't use plagiarized sources. Get Your Custom Essay on
Nats 10
Get an essay WRITTEN FOR YOU, Plagiarism free, and by an EXPERT!
Order Essay

2. You’ve stumbled across a box containing a radioisotope and you open it. As you stare at the visually unimpressive lump of material in the box about 40 cm from your face, it occurs to you that you could be causing serious harm to yourself. What specific information do you need to know about the material in the box in order to determine whether you’re safe or whether you need to seek medical attention? Explain.

3. The Fukushima nuclear reactor accident caused the environmental release of significant amounts of radioactive caesium (Cs) isotopes. Specifically, caesium-134 and caesium137, which have half-lives of, respectively, two years and 30 years. The survey of soil radioactivity conducted in late May, 2011 revealed soil surface Cs-134 activity of about 4600 kBq/m2 in the town of Okuma (roughly 10 km from the stricken power plant) and Cs-137 activity of roughly 5000 kBq/m2 . Disregarding any other changes or cleanup efforts, what would you expect the radioactivity due to these caesium isotopes to be in Okuma today compared to their original levels? (Semi-quantitative or qualitative statements are sufficient.) Explain.

4. Your friend is terribly afraid of radiation, so naturally her wealthy and mischievous younger brother offers her a choice for her birthday: a day-long walking tour of Okuma (during which she may wear a mask), where the residual radiation dose (from the 2011 accident) averages roughly 4 micro-Sieverts (or 0.004 mSv) per hour above normal background, OR dinner in far-from-Fukushima Tokyo where fresh fish caught off the coast of Fukushima prefecture and rice grown near Okuma will be served. In the absence of any other information, which option would you advise your friend to choose, and why? (There is no secret third option…)

5. In your own words, explain why spent nuclear fuel needs continuous cooling for at least ten years after its removal from the core of a reactor. What is the source of ongoing heat?

6. Genetically-modified sugar beets are being investigated as a possible source crop for the production of ethanol biofuel. Some studies suggest that sugar beets could yield more ethanol per kilogram, and for a lower cost, compared to corn.
a) In your own words, explain the basic reason for which biofuels such as ethanol (and biodiesel) are renewable.
b) Under what conditions would ethanol produced from sugar beets be carbonneutral?

7. Explain why further advances in energy-storage technologies will be crucial for thecontinued expansion of utility-scale wind and solar photovoltaic power? List at least two possible energy storage options.

8. The technology now exists to produce reliable and efficient electric cars that do not require fossil fuels and that produce no carbon dioxide or other atmospheric emissions.
a) Explain one reason why the use of an electric car might not eliminate your transportation carbon footprint.
b) Find out which Canadian provinces are most likely to see real reductions in carbon emissions as a result of the introduction of electric cars. (Cite your sources, as usual.)
Remember from the course notes that coal emits at least twice as much carbon dioxide for the same amount of released thermal energy as does gasoline or natural gas. (HINT: How does each province produce its electricity?)

Homework Market
Order a unique copy of this paper
(550 words)

Approximate price: $22

Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

Since all our papers are written from scratch, the papers we submit are plagiarism free and we strictly adhere to lecturer’s instructions. Our writers are highly qualified from all over the world and include graduates and professors from most of the largest and known universities in the world. Once you have assigned us your assignment, we select the most qualified and reliable writer to handle your assignment.

Money-back guarantee

Unlike other writing companies, we encourage clients to draw back their money at any stage of the writing process if they experience any uncertainties with the quality of generated content. However, you will hardly have to make this decision because of our business approach that suits your needs.

Zero-plagiarism guarantee

We have an advanced plagiarism-detection system that flags any work that fails to meet the required academic expectations. Our company thrives in honesty, and as such, you will be guaranteed to achieve a paper that meets your expectations.

Timely delivery of urgent papers

At we have online agents that you can chat with to have your assignment taken care of with the little remaining time. Also, we have professional academic writers who will work on your assignment providing you with a high-quality paper at the same time. We can take care of your urgent assignments in less than 5 hours.

Privacy policy

We uphold confidentiality and privacy through our interactions with clients, an aspect that has enhanced our relationship with prospective customers seeking for assignment help. We do not disclose your information with third-parties; neither do we share your work with any other person apart from you.

We do not offer pre-written essays

We do not resell previously-done tasks delivered to other clients. When we deliver orders to our clients, we safeguard their privacy and confidentiality by ensuring the third party does not access the work. By writing the papers from scratch, we have managed to maintain a certain level of originality, which defines our business model. Our qualified editors proofread all submitted work to eliminate mistakes that can interfere with the credibility of the assignment.

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
The price is based on these factors:
Academic level
Number of pages