男女羞羞视频在线观看,国产精品黄色免费,麻豆91在线视频,美女被羞羞免费软件下载,国产的一级片,亚洲熟色妇,天天操夜夜摸,一区二区三区在线电影
首 頁 | 新聞英語 | 視聽英語 | 翻譯園地 | 實用英語 | 專欄作家 | 奧運英語 | 新詞新譯 | 書友天地 | 輕松英語  | 凈臉聯盟 | 英語論壇 | 少兒英語
您現在的位置: En_language tips > 輕松英語 > 一問到底 Dec 26, 2005
 





  Why do golf balls have dimples?

golfball  
Why do golf balls have dimples? Notes:

So that they look cute? NO!

Because the dimples maximize the distance golf balls travel. Dimpled balls travel up to four times farther than smooth-surfaced golf balls.

In the early days of golf, smooth-surfaced balls were used until golfers discovered that old, bumpy balls traveled longer distances. The science of aerodynamics helps explain the dimpled phenomenon. The dimples reduce the drag on a golf ball by redirecting more air pressure behind the golf ball rather than in front of it. The higher levels of pressure behind the golf balls force them to go far distances.

The dimples change the levels of pressure by bringing the main air stream very close to the surface of the golf ball. The dimples, or "turbulators," increase the turbulence in the layer of air located next to the surface of the ball. This high-speed air stream near the ball increases the amount of pressure behind the ball-thereby forcing the ball to travel farther.

 

 

 

 


aerodynamics: 空氣動力學

 
 
 
Copyright by chinadaily.com.cn. All rights reserved
版權聲明:未經中國日報網站許可,任何人不得復制本欄目內容。如需轉載請與本網站聯系。
None of this material may be used for any commercial or public use. Reproduction in whole or in part without permission is prohibited.
主站蜘蛛池模板: 榕江县| 德钦县| 安新县| 宜川县| 成安县| 龙井市| 桦甸市| 甘南县| 酉阳| 嘉义县| 沅陵县| 平度市| 肇庆市| 武胜县| 犍为县| 泊头市| 三都| 和平县| 朝阳区| 万源市| 突泉县| 衡阳县| 赣州市| 贵南县| 濉溪县| 日照市| 建水县| 廊坊市| 融水| 涞水县| 洛隆县| 二连浩特市| 色达县| 河南省| 寻乌县| 汉阴县| 古丈县| 舟曲县| 内黄县| 时尚| 吉林省| 双流县| 景泰县| 澄迈县| 理塘县| 通海县| 中卫市| 柯坪县| 华蓥市| 合山市| 中西区| 渭源县| 石渠县| 南召县| 大港区| 五大连池市| 格尔木市| 逊克县| 昂仁县| 银川市| 驻马店市| 广宗县| 凤山市| 玛曲县| 南岸区| 许昌市| 邳州市| 措勤县| 揭东县| 遂平县| 尉犁县| 龙游县| 凤庆县| 云林县| 齐齐哈尔市| 威宁| 海淀区| 凉城县| 泾源县| 乐至县| 新龙县| 平果县|