首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Experienced baseball fielders can tell how far a ball is going to travel just by listening to the crack of the bat. If they didn
Experienced baseball fielders can tell how far a ball is going to travel just by listening to the crack of the bat. If they didn
admin
2013-02-16
48
问题
Experienced baseball fielders can tell how far a ball is going to travel just by listening to the crack of the bat. If they didn’t, they wouldn’t stand a chance of catching it, claims a physicist in New York.
"When a baseball is hit straight at an outfielder, he cannot quickly judge the angle of the scent and the distance the ball will travel." says Robert Adair, a physicist at Yale University. If he relied purely upon visual information, the fielder would have to wait for about one-and-a-half seconds before he could tell accurately if the pitcher hit the ball long or short. By this time the ball may have traveled too far for him to reach it in time.
To stand a fighting chance of catching it, according to Adair, fielders must listen to the sound the ball hitting the bat to judge how far it will travel. There is anecdotal evidence to support this, he says. A former centre fielder told Adair: "If I heard a crack 1 ran out, if I heard a clunk, I ran in."
To test his hypothesis, Adair calculated how quickly a fielder could change direction if he had misjudged whether the ball was going long or short. The difference between the "crack" and "clunk" can be explained by how well the batter has hit the ball, and could mean a difference in running distance of as much as 30 metres, he told delegates at a meeting of the Acoustical Society of America in Chicago last week.
Scientists already knew that to hit a ball long the batter must strike it somewhere near the vibrational node of the bat, known as the sweet spot. Balls hit on the sweet spot generate fewer energy-sapping vibrations in the bat, allowing greater energy transfer to the ball. Conversely, mishit balls make the bat vibrate strongly and so do not travel as far.
Adair is quick to point out that this only applies to wooden bats, which are used in major league baseball. Aluminum bats, on the other hand, tend to produce a fairly uniform "ping" sound regardless of where you hit them.
Which of the following statements best summarizes the main idea of this passage?
选项
A、Hitting the ball to produce different sounds is not an easy matter
B、Wooden bats are better than aluminum ones to be used in major league baseball
C、The sound of the bat may give fielders more chances to catch the ball
D、The study of Robert Adair shocks the Acoustical Society of America.
答案
C
解析
根据文章内容可知,作者是在介绍棒球击打的声音有助于外场员作出判断,从而抓住球的机会也就多一些。据此判断,答案是C。
转载请注明原文地址:https://kaotiyun.com/show/ohmO777K
0
考博英语
相关试题推荐
Withhumanfootprintsonthemoon,radiotelescopeslisteningformessagesfromaliencreatures(whomayormaynotexist).techn
Thediscoveryoftheobesitygeneinhumanshalfadecadeagoofferedevidencethatchronicweightgainistheconsequenceofa
Theconceptofbiodiversityencompassesseveraldifferentlevelsofbiologicalorganization,fromtheveryspecifictothemost
Itisnotoftenrealizedthatwomen【1】ahighplaceinsouthernEuropeansocietiesinthe10thand11thcenturies.Asa【2】,thew
(1)GeraldFeinberg,theColumbiaUniversityphysicist,oncewentsofarastodeclarethat"everythingpossiblewilleventually
ThailandconfirmedthreenewhumanbirdflucasesThursdayashealthofficialswarneditcouldtaketwoyearstoconquerAsia’s
Cloningshakesusalltoourverysouls.Forhumanstoconsiderthecloningofoneanotherforcesthemalltoquestionthevery
Listeningoutforwhalesongisonewaythatshipscanavoidcollidingwithwhales.Butwhatdoyoudoifthewhalesaren’tsing
Helencouldnothelpfeelingantipathytowardherfather’snewwifewhomhemarriedjusttwomonthsafterthedeathofHelen’sm
Inthepastoysterswereraisedinmuchthesamewayasdirtfannersraisedtomatoes—bytransplantingthem.First,farmersselec
随机试题
解释什么是国际收支。
确诊血管相关性感染时,导管尖端培养结果为阳性的是
酮体包括
根据我国《刑事诉讼法》的规定,除法律特别规定的以外,公安机关负责对刑事案件的侦查、拘留、预审等。人民法院负责对刑事案件的审讯。人民检察院负责检察,检察机关直接受理的案件的侦查、提起公诉等,此外还负责:
优质结构工程质量控制资料包括土壤中氡浓度检测报告。()
某公司拟使用短期借款进行筹资。下列借款条件中,不会导致实际利率高于名义利率的是()。
下列有关注册会计师在临近审计结束时运用分析程序的说法中,错误的是()。(2017年)
到某一游览点后,若有个别旅游者希望不按规定的线路游览而要求自由游览或摄影时。若环境许可,导游人员可满足其要求。
(A)条件(1)充分,但条件(2)不充分。(B)条件(2)充分,但条件(1)不充分。(C)条件(1)和条件(2)单独都不充分,但条件(1)和条件(2)联合起来充分。(D)条件(1)充分,条件(2)也充分。(E)条件(1)和条件(2)单独都不充分,条
已知|a|=2,|b|=且a.b=2,则|a×b|=_____.
最新回复
(
0
)