Newton believed that the path of a planet going around the sun was ______ called an ellips

提问人：网友dlhymall 发布时间：2022-01-07

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更多“Newton believed that the path …”相关的问题

第1题

Consider the orbital motion of a planet going around the Sun. Which of the following statements about the motion is true?

A、Only the mechanical energy of planet is conserved.

B、Only the angular momentum of planet is conserved.

C、Both the angular momentum and mechanical energy of planet are conserved.

D、Neithor of the angular momentum or mechanical energy of planet is conserved.

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第2题

A great deal of attention is being paid today to the so-called digital divide—the division of the world into the info(information) rich and the info poor. And that divide does exist today. My wife and I lectured about this looming danger twenty years ago. What was less visible then, however, were the new, positive forces that work against the digital divide. There are reasons to be optimistic.

There are technological reasons to hope the digital divide will narrow. As the Internet becomes more and mere commercialized, it is in the interest of business to universalize access—after all, the more people online, the more potential customers there are. More and more governments, afraid their countries will be left behind, want to spread Internet access. Within the next decade or two, one to two billion people on the planet will be netted together. As a result, I now believe the digital divide will narrow rather than widen in the years ahead. And that is very good news because the Internet may well be the most powerful tool for combating world poverty that we've ever had.

Of course, the use of the Internet isn't the only way to defeat poverty. And the Internet is not the only tool we have. But it has enormous potential.

To take advantage of this tool, some impoverished countries will have to get over their outdated anti-colonial prejudices with respect to foreign investment. Countries that still think foreign investment is an invasion of their sovereignty might well study the history of infrastructure (the basic structural foundations of a society) in the United States. When the United States built its industrial infrastructure, it didn't have the capital to do so. And that is why America's Second Wave infra structure—including roads, harbors, highways, ports and so on—were built with foreign investment. The English, the Germans, the Dutch and the French were investing in Britain's former colony. They financed them. Immigrant Americans built them. Guess who owns them now? The Americans. I believe the same thing would be true in places like Brazil or any where else for that matter. The more foreign capital you have helping you build your Third Wave infrastructure, which today is an electronic infrastructure, the better off you're going to be. That doesn't mean lying down and becoming fooled, or letting foreign corporations run uncontrolled. But it does mean recognizing how important they can be in building the energy and telecom infrastructures needed to take full advantage of the Internet.

Digital divide is something ______.

A．getting worse because of the Internet

B．the rich countries are responsible for

C．the world must guard against

D．considered positive today

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第3题

More than half of the teachers in the survey said they thought pla_________ from the Internet was a serious offense.

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第4题

1955 ist Deutschland ein mitgliedsstaat von ________ geworden. Die Bundeswehr beteiligt sich seit 1999 an den geführten Einsätzen mit.

A、EU