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
医学
If you are caught in a downpour, it is better to run for shelter than walk, researchers in the US advise. This may sound obvious
If you are caught in a downpour, it is better to run for shelter than walk, researchers in the US advise. This may sound obvious
admin
2013-10-31
90
问题
If you are caught in a downpour, it is better to run for shelter than walk, researchers in the US advise. This may sound obvious, but an earlier study in Britain suggested that you would get just as wet running as walking.
In 1995, Stephen Belcher of the University of Reading and his students calculated how much water falls on top of your head and how much you sweep up on your front as you move forward. Obviously, you would get wettest standing still, and less wet the faster you moved. But the Reading team found that the benefits of running faster than about 3 metres per second—which they described as a walking pace—were tiny.
Thomas Peterson and Trevor Wallis, meteorologists at the National Climatic Data Center in Asheville, North Carolina, had a hunch that this was wrong. They realized that the Reading team had overestimated the average walking pace, so they reworked the calculations for a walking pace of 1.5 metres per second and a running speed of 4 meters per second.
Peterson and Wallis conclude in the latest issue of Weather that a walker would get 16 per cent wetter than a runner over a distance of 100 meters in drizzle. In heavy rain, this would rise to 23 per cent. When the researchers allowed for the way that runners tend to lean forward, sheltering the front of their bodies but increasing the rainfall on their backs, they found that a walker would get 36 per cent wetter than a runner in heavy rain.
Not content with theory alone, Peterson and Wallis decided to test their ideas. " If verification requires an $ 80 million satellite, one may have to forgo verification, " says Peterson. "But if it involves a simple experiment, that’ s another matter. " Peterson and Wallis are roughly the same size. Wearing identical clothing, one ran 100 meters in heavy rain and the other walked.
They weighed their clothes before and after the experiment. This showed that the walker bad absorbed 0.22 kilograms of water, while the runner had soaked up only 0. 13 kilograms. This is about 40 per cent less, is line with the model’ s predictions.
Belcher says that his team’ s work was a bit of fun, and that apart from the confusion over what a typical walking speed is, their results were similar to those of Peterson and Wallis. "I’m delighted to see that their experiments gave results in qualitative agreement with the model," says Belcher.
But why not just take an umbrella? For anyone thinking of taking the easy way out, Wallis has a warning: "Running with an umbrella has a negative impact on your aerodynamics. "
Which of the following, according to the American researchers, gets the least wet?
选项
A、Running in drizzle.
B、Walking in drizzle.
C、Running in heavy rain.
D、Walking in heavy rain.
答案
A
解析
根据常识可知在细雨中肯定比大雨中淋湿得少,第四段开头讲到在细雨中a walker比a runner的淋湿程度要高16 per cent,而在大雨中淋湿程度要高23 percent。由此可以推断在细雨中跑步的人淋湿程度最低。
转载请注明原文地址:https://kaotiyun.com/show/y9U3777K
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
High-speedlivinghasbecomeafactoflife,andthefranticpaceistakingitstoll,accordingtosciencewriterJamesGleick.
Cultureshockmightbecalledanoccupationaldiseaseofpeoplewhohavebeensuddenlytransplantedabroad.Likemostailments,
Ifyouarecaughtinadownpour,itisbettertorunforshelterthanwalk,researchersintheUSadvise.Thismaysoundobvious
Idon’tknowhowyoucouldhaveleftoutthemostimportantfactofall.
AboywhostrugglestoreadEnglishprimary-schoolstorybooksyethasnotroublewithuniversityphysicstextbooksinJapanesei
Biotechnologyisexpectedtobringimportantadvancesinmedicaldiagnosisandtherapy,insolvingfoodproblems,inenergysavi
Everyonehasseenithappen.Acolleaguewhohasbeenexcited,involved,andproductiveslowlybeginstopullback,loseenergy
Peoplewholiveandworkinareaswithelevatedlevelsofozoneandotherairbornepollutantsappeartorunanincreasedriskof
TheSupremeCourt’sdecisionsonphysician-assistedsuicidecarryimportantimplicationsforhowmedicineseekstorelievedyin
Somefuturologistshaveassumedthatthevastupsurgeofwomenintheworkforcemayportendarejectionofmarriage.Manywomen,
随机试题
价格构成
监测中发现某水体含氮化合物指标较以往的数据有明显改变,其中氨氮、亚硝酸盐氮明显升高、硝酸盐氮变化不大。大致可判断该污染类型为
由县级以上人民政府报经上一级政府决定可以在传染病流行时采取的紧急措施是( )
A.P波呈双峰B.P—R间期逐渐延长C.P波消失,代之以f波D.P波与QRS波群完全无关E.P波逆行型,与QRS波群关系恒定二度I型房室传导阻滞()
下列关于期权的表述中,不正确的是()。
客户关系管理的构成指标包括()。
古代将每月的第一日称作()。
()幼儿的特点是求知欲强,好学乐问,对周围的一切都非常关注。
2007年末,石家庄市常住人口939.50万人,比上年增长1.3%,其中市区231.3万人,比年初增长3.2%,全市人口出生率13.96‰,比上年下降1.29‰;死亡率5.75‰,比上年提高0.22‰;全市总人口自然增长率8.22‰,比上一年下降1.51‰
列宁说:“民主共和制是资本主义所采用的最好的政治外壳。”这句话应理解为,民主共和制()
最新回复
(
0
)