Archive for the ‘global-warming’ Category

Obama’s Inaugural Address: One for the Ages?

Friday, January 23rd, 2009

At first I felt let down by Obama’s inaugural address. I showed it live in my Physics class and was overly concerned about the technical details like volume and lighting levels. It lacked the practiced rhythms of a stump speech which Obama would have had the chance to refine. He talked way too fast for my slow ears to hear what the author of this article was able to discern. That’s how history gets made. The significant ones, like the Gettysburg address, are lost on most listeners. After the speech my class discussed a solar energy physics problem. Everyone agreed that green collar jobs would help get our economy on track.

Imagine

Please take the time to read and discuss, before attending to those necessary “matters of consequence” which fill up our years.

The speech analysis:
http://www.dailykos.com/storyonly/2009/1/21/195515/922

Text and video of the speech:
http://news.yahoo.com/s/ap/20090120/ap_on_go_pr_wh/inauguration_obama_text

Here’s one of my favorites:

For everywhere we look, there is work to be done. The state of the economy calls for action, bold and swift, and we will act — not only to create new jobs, but to lay a new foundation for growth. We will build the roads and bridges, the electric grids and digital lines that feed our commerce and bind us together. We will restore science to its rightful place, and wield technology’s wonders to raise health care’s quality and lower its cost. We will harness the sun and the winds and the soil to fuel our cars and run our factories. And we will transform our schools and colleges and universities to meet the demands of a new age. All this we can do. All this we will do.

Now, there are some who question the scale of our ambitions — who suggest that our system cannot tolerate too many big plans. Their memories are short. For they have forgotten what this country has already done; what free men and women can achieve when imagination is joined to common purpose, and necessity to courage.

Is an Electric Scooter in My Future?

Friday, April 4th, 2008

I have a 4 mile commute to get to my workplace. I have a teenager who has started to drive, so we are thinking of getting a third car. Riding a bike would be nice, but I am finding it hard to get motivated to actually follow through on the plan. An electric scooter makes a lot more sense. I am a little concerned about finding a low-traffic route, but I think that can be arranged.
Electric Scooter
The EVTA Z-20b electric scooter costs only $3000 delivered. It has a range of 30 miles with a top speed of 45 mph (72 kmh). They claim it takes only 2 kwh to fully charge. It seems incredible that it can travel so far on so little energy. Did they leave off a 0 or something? I just got my electric bill and I owe $27.61 for 225 kWH: ($27.61/225 kWH) = 12.27 cents per kWH. 2 kwh would cost only $0.25. How is that possible?

Let’s approach the problem another way. The motor generates 2500 Watts. At 30 mph it would take one hour to travel 30 miles.

(2500 Watts) * (one hour) = 2.5 kWH,

which is in good agreement with their claim. Assume 1 kwh of coal based electrical energy produces 0.97 kg of Co2. If traveling 30 miles requires 2.5 kWh, then the amount of CO2 generated is

(2.5 kWh)* (0.97 kg CO2/kWh) = 2.4 kg.

My Corolla gets about 30 miles/gallon. One gallon of gas generates 9 kg of CO2.

(2.4 kg / 9 kg ) * 100 = 27%.

The electric scooter and driver weigh about 227 kg, while the Corolla and driver weigh about 1270 kg.

(227 kg) / (1270 kg) * 100 = 18%.

The scooter weighs 1/5 as much as the car. Hence, a lot less energy and about 1/4 as much CO2 is generated as compared to a gas powered economy car.

Updates:

Spreadsheet showing a comparison between the EVTA z20b, the Enertia, and the Myers Motors NMG.

Video of conversion of gas powered motorcycle to all electric.

What is the matter with the US? 5% of the population burns 25% of the fossil fuel. We have allowed ourselves to be led into a war so the multinational oil companies can control dwindling oil reserves. Oil prices are well above $100 a barrel due to the continuing war and new demand from the developing economies such as China and India. Profits of the oil companies are through the roof. Truckers are striking. Airlines are going bankrupt. What really bugs me is that NOBODY has undertaken an effective plan to break the oil habit in transportation. Tesla offers a high performance electric car affordable by a handful of people with movie star incomes. As long as most of our electrical energy comes from coal, the only way electric vehicles make sense is to greatly reduce the mass. Yamaha and Honda seem to be in the development stage. They have the leverage to produce on a mass scale, but, so far, only for the Japanese market.
Enertia electric motorcycle in traffic

The Enertia Electric Motorcycle costs 4 times more then the z20b, but has superior batteries and greater power output.

Deciding Whether a Top Technical School is for You

Saturday, September 15th, 2007

The following was inspired by, 10 Lessons from an MIT Education.
The article is full of wisdom. When I was young, I was more hopeful than wise. I perceived older people’s “wisdom” as limitations on my freedom. However, I have grown to be thankful for those few threads I managed to weave into my life. My mom, my older brother Charles (place link to eventual blog here), and a guy named Garth Cate all had a big influence on me.

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Extracting Hydrogen from H2O

Monday, June 4th, 2007

I heard about an interesting case of scientific serendipity. A Purdue scientist was cleaning a crucible used to produce an alloy of germanium and aluminum. When water was added, it caused a minor explosion. Read the article at Phys.org. Aluminum reacts very strongly with oxygen; so strongly that it builds a skin of aluminum oxide which stops the reaction. The germanium keeps the aluminum from oxidizing with airborn oxygen. The unoxidized aluminum strongly reacts with water in a reaction that frees hydrogen gas.
If this works it could be a great way to fuel hydrogen fuel cells. Hydrogen is very hard to handle in bulk quantities. If it could be produced on demand from water, it would be easy to transport.

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Replaced My Incandescents with CFLs

Monday, May 28th, 2007

I spent a few hours this Memorial Day weekend to replace all my incandescent bulbs with CFL. I don`t usually shop at Walmart, but I did this time because they had the variety of CFLs I needed to do the replacement. My wife asked for brighter lights in the kitchen, so I got some of the 26 Watt variety.

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Podcast Journal March 2007

Tuesday, March 20th, 2007

I have been using Google Reader to browse through RSS feeds from various sources. Antiwar.com had a great interview with Helen Caldicott who is an authority on nuclear power and nuclear weapons. It is well worth hearing. She also recommends reading the New Nuclear Danger which examines the indebtedness of the Bush administration to the arms industry.

Dr. Helen Caldicott, author of Nuclear Power is Not the Answer, War in Heaven: The Arms Race in Outer Space, discusses the incredible amount of nuclear weapons in the hands of the United States and Russia and the non-threats of Iran and North Korea, Reagan and Gorbachev’s near agreement to abolish them in 1987, the danger of Pakistani nukes falling into the hands of Taliban types, Israel’s nukes, what a 20-megaton H-bomb would do to Phoenix, Three Mile Island, the damage at the local nuclear plant, and hears from a caller – a former U.S. military nuclear missile launcher – how she changed his life.

Podcast Journal 10/28 – 11/3 2006

Friday, November 3rd, 2006

It’s the week before the 2006 midterm elections. One of the best science shows I listened to was Science Friday. A new organization called Scientists and Engineers for America is planning to educate the government about our core values of science. The main spokes person is Susan Wood who resigned from the FDA over making the Plan B contraceptive available to women as an over the counter drug. She was distressed at the way the opinions of researchers was being ignored in the decision making process.

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An Inconvenient Truth: Movie Transcript

Wednesday, September 20th, 2006

I have no connection to Al Gore or the makers of the movie. Aside from the titles and pictures, the following text is an unofficial transcript of the movie, An Inconvenient Truth. It is created to help in the discussion of this important issue. I recommend that as many as possible should see the movie. Whether you agree or not is unimportant. The movie will help you judge for yourself which direction we should take. After seeing the movie, use this page to dig deeper into the material. Not everyone has been exposed to the the science and debate behind global warming. Therefore, I have included links to web pages and pictures for those wishing to find out more.

The Keeling curve legacy.