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提问人：网友zhshjun0825 发布时间：2022-01-07
[主观题]

Is nothing sacred？ Even the idle weekend pastime of skimming stones on a lake has been tak

en apart and reduced to a mathematical formula.

Everyone knows a stone bounces best on water if it's round and flat, and spun towards the water as fast as possible. Some enthusiasts even travel to international stone-skimming competitions, like world champion Jerdone Coleman-McGhee, who made a stone bounce 38 times on Blanco River, Texas, in 1992.

Intuitively,a flat stone works best because a relatively large part of its surface strikes the water, so there's more bounce. Inspired by his eight-year-old son, physicist Lyderic Bocquet of Lyon University in France wanted to find out more. So he tinkered with some simple equations describing a stone bouncing on water in terms of its radius(半径) ,speed and spin, and taking account of gravity and the water's drag.

The equations showed that the faster a spinning stone is travelling, the more times it will bounce. So no surprise there. To bounce at least once without sinking, Bocquet found the stone needs to be travelling at a minimum speed of about 1 kilometre per hour.

And the equations also backed his hunch(直觉) that spin is important because it keeps the stone fairly flat from one bounce to the next. The spin has a gyroscopic(陀螺的) effect, preventing the stone from tipping and falling sideways into the water.

To match the world record of 38 bounces using a 10-centimetre-wide stone, Bocquet predicts it would have to be travelling at about 40 kilometres per hour and spinning at 14 revolutions a second. He adds that drilling lots of small pits in the stone would probably help, by reducing water drag in the same way that dim pies on a golf ball reduce air drag. "Although I suppose that would be cheating," says Bocquet.

He and his team at Lyon hope to design a motorized "catapult" that can throw stones onto a lake with a precise speed and spin, to test if the predictions stand up.

Bocquet adds that he's probably just rediscovering a piece of history. British engineer Barnes Wallis must have done the same sort of maths and experiments when he was designing his famous bouncing bombs for the Dambusters squadron(中队) during the Second World War.

Which of the following could be the best title for this passage？

A．International stone-skimming competitions.

B．How to make stone-skimming more enjoyable.

C．Stone-skimming is a sacred thing.

D．The mathematical formula for stone-skimming.

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更多“Is nothing sacred？ Even the idle weekend pastime of skimming stones on a lake has been tak”相关的问题
第1题
What are the main functions of dances in their cultures？A．Traditional dances performed are

What are the main functions of dances in their cultures？

A．Traditional dances performed are nothing more than a spectacle.

B．Dances are mainly for entertainment in their customs.

C．They sometimes perform. dances for sacred ceremonies.

D．In their cultures dance is only for the ritual ceremonial service.

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第2题
听力原文：W: Today's arts report betrays Dan Parker of the American Indian Dance Theater. I
understand your troupe performs traditional music and dance from many different Native American cultures. Can you give us an idea of some of the dances you'll be doing in your performance tonight？

M: Certainly. We'll be doing won-ns-award dance. Originally it was a story telling device to recount battles. Another is the grass dance, performed by the plains Indians, where they actually flatten tall field grass to prepare it for a ceremony.

W: Since your dancers are from many different tribes, how can you be sure the dances are done correctly？

M: Everything we do has been approved by the elders of our tribes. That's partly because we do not necessarily know each other's style. or dances. But it's also because it's hard to get complete agreement even within the same tribe exactly how the dance should be done.

W: Anyone who attends one of your performances will notice that your company goes to a lot of trouble to provide detailed explanations of the origin of the dances, the music, the costumes and so forth. Could you explain to our listeners, why you do these？

M: Good questions. There are always concerns that traditional dances performed are nothing more than a spectacle. Our explanations show that in our cultures, dance is ritual rather than entertainment. We also want to make it clear to our audience that we are not performing any dances used for sacred ceremonies.

Why are the dances approved by the elders of the tribes？

A．All of the activities in the tribe are sponsored by the elders.

B．The elders must give approval to perform. sacred dances.

C．The elders make sure the dances are performed properly.

D．The elders are the most experienced ones.

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第3题
听力原文：W: Today's arts report betrays Dan Parker of the American Indian Dance Theater. I
understand your troupe per forms traditional music and dance from many different Native American cultures. Can you give us an idea of some of the dances you'll be doing in your performance tonight？

M: Certainly. We'll be doing won-us-award dance. Originally it was a story telling device to recount battles. An- other is the grass dance, performed by the plains Indians, where they actually flatten tall field grass to prepare it for a ceremony.

W: Since your dancers are from many different tribes, how can you be sure the dances are clone correctly？

M: Everything we do has been approved by the elders of our tribes. That's partly because we do not necessarily know each other's style. or dances. But it's also because it's hard to get complete agreement even within the same tribe exactly how the dance should be done.

W: Anyone who attends one of your performances will notice that your company goes to a lot of trouble to provide detailed explanations of the origin of the dances, the music, the costumes and so forth. Could you explain to our listeners, why you do these？

M: Good questions. There are always concerns that traditional dances performed are nothing more than a spectacle. Our explanations show that in our cultures, dance is ritual rather than entertainment. We also want to make it clear to our audience that we are not performing any dances used for sacred ceremonies.

Why are the dances approved by the elders of the tribes？

A．All of the activities in the tribe are sponsored by the elders.

B．The elders must give approval to perform. sacred dances.

C．The elders make sure the dances are performed properly.

D．The elders are the most experienced ones.

点击查看答案
第4题
Liberty cannot be preserved without a general knowledge among the people, who have a right
, from the frame. of their nature, to knowledge, as their great Creator, who does nothing in vain, has given them understandings, and a desire to know; but besides this, they have a right, an indisputable, unalienable, indefeasible, divine right to that most dreaded and envied kind of knowledge; I mean, of the characters and conduct of their rulers. Rulers are no more than attorneys, agents, and trustees, for the people; and if the cause, the interest and trust, is insidiously betrayed, or wantonly trifled away, the people have a right to revoke the authority that they themselves have deputed, and to constitute abler and better agents, attorneys, and trustees and the preservation of the means of knowledge among the lowest ranks is of more importance to the public than all the property of all the rich men in the country. It is even of more consequence to the rich themselves, and to their posterity. The only question is whether it is a public emolument: and if it is, the rich ought undoubtedly to contribute, in the same proportion as to all other public burdens—that is, in proportion to their wealth, which is secured by public expenses. But none of the means of information are more sacred, or have been cherished with more tenderness and care by the settlers of America, than the press. Care has been taken that the art of printing should be encouraged, and that it should be easy and cheap and safe for any person to communicate his thoughts to the public.

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第5题
Peacock is the sacred bird for Hera.
点击查看答案
第6题
Historically, the North Sacred Mountain Hengshan has been a sacred place for _____ activities.
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第7题
Tai mountain is the second of the five sacred mountains（）
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第8题
A．classicalB．sacredC．lightD．popular

A.classical

B.sacred

C.light

D.popular

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第9题
After World War 11 the glorification of an ever larger GNP formed the basis of a new mater
ialism, which became a sacred obligation for all Japanese governments, businesses, and trade unions. Anyone who mentioned the undesirable by-products of rapid economic growth was treated as a heretic. Consequently everything possible was done to make conditions easy for the manufacturers.【1】Few dared question the wisdom of discharging untreated waste into the nearest water body or untreated smoke into the atmosphere. This silence was maintained by union leaders as well as most of the country's radicals; except for a few isolated voices, no one protested.【2】An insistence on treatment of the various effluents would have necessitated expenditures on treatment equipment that in turn would have given rise to higher operating costs. Obviously this would have meant higher prices for Japanese goods, and ultimately fewer sales and lower industrial growth and GNP.

【3】The pursuit of nothing but economic growth is illustrated b v the response of the Japanese government to the American educational mission that visited Japan in 1947. After surveying Japan's educational program, the Americans suggested that the Japanese fill in their curriculum gap by creating departments in chemical and sanitary engineering. Immediately, chemical engineering departments were established in all the country's universities and technical institutes. In contrast, the recommendation to form. sanitary engineering departments was more or tess ignored, because they could bring no profit. By 1960, only two second-rate universities, Kyoto and Hokkaido, were interested enough to open such departments.

【4】The reluctance to divert funds from production to conservation is explanation enough for a certain degree of pollution but the situation was made worse by the type of technology the Japanese chose to adopt for their industrial expansion. For the most part, they simply copied American industrial methods.【5】This meant that methods originally designed for use in a country that stretched from the Atlantic to the Pacific with lots of air-and water to use as sewage receptacles were adopted for an area a fraction of the size. Moreover the Japanese diet was niche more dependent on water as a source of fish and as an input in the irrigation of rice; consequently discharged wastes built up much more rapidly in the food chain.

(76)

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第10题
神圣的

A.sakred

B.sacrid

C.sacret

D.sacred

点击查看答案
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