Moreover, airplanes use a lot of their fuel just getting into the air. They simply are not fuel efficient on short trips. High speed trains may be an answer. One fairly new proposal for such a train is for something called a MAGLEV, meaning a magnetically levitated train. Magievs will ...
Today, I’m going to talk about what one community is doing to save energy at present. The people of Davis, California have succeeded in cutting their energy consumption by one-third since 1973. All new houses in Davis must make sure that the heat will not escape unnecessarily during the ...
【小题1】What is the main topic of the talk?A . Energy conservation.B. New housing construction.C. T he number of bicycles and cars.【小题2】What is the purpose of building newhouses facing north or south?A . T o keep out the cold.B . T o keep other houses warm.C. T o ...
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The law is called the conservation of energy. It states that there is a certain quantity, which we call “energy,” that does not change in the manifold changes that nature undergoes. That is a most abstract idea, because it is a mathematical principle; it says there is a numerical ...
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8. What is the topic of the man's essay?A. Energy conservation.B. Computer technology.C. Environmental protection.9. How does the woman suggest the man do the research?A. By conducting an interview. B. By using a questionnaire.C. By carrying out a survey.10. What makes the man feel...
The problem is the assumption that these ideas we use like "energy", "force" and "field" describe real physical things.The word "energy" is a well-defined...
A basic law of physics (the conservation of energy) tells us it's impossible to do anything on earth without using energy—even something as simple and effortless as thinking needs us to consume food, which is simply energy we feed in through our mouths. Our homes need energy too, for ...