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
32
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. "
They verified their model predictions by experimenting______.
选项
A、on themselves
B、with a satellite
C、on the twins of the same size
D、with sophisticated calculating devices
答案
A
解析
第五段最后以及第六段叙述了Peterson和Wallis的实验,通过叙述可知两人是以自己为实验对象的。
转载请注明原文地址:https://kaotiyun.com/show/89U3777K
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
A、Ariseineggprice.B、Ahighincidenceofheartdisease.C、Adropineggsales.D、Theemergenceofanewlifestyle.C录音讲到人们发
Despitegrowingnumbersofjoggers,CanadaFitnessSurveysacrossthecountrydemonstratethatCanadiansarelessphysicallyfit
Ifyouarecaughtinadownpour,itisbettertorunforshelterthanwalk,researchersintheUSadvise.Thismaysoundobvious
Convincingthepublictofollowhealthadvicecanbetoughandtime-consuming.Thismaybewhychangestohealthmessagesareof
Convincingthepublictofollowhealthadvicecanbetoughandtime-consuming.Thismaybewhychangestohealthmessagesareof
Long-sufferingcouplestakeheart.Thereisagoodreasonforthoseendlessargumentsinthefrontofthecar:menandwomenuse
InMr.Allen’shighschoolclass,allthestudentshaveto"getmarried".However,theweddingceremoniesarenotrealonesbut
InMr.Allen’shighschoolclass,allthestudentshaveto"getmarried".However,theweddingceremoniesarenotrealonesbut
Humusisdecayedorganicmatterthatisanimportantelementoffertilesoil.
Somefuturologistshaveassumedthatthevastupsurgeofwomenintheworkforcemayportendarejectionofmarriage.Manywomen,
随机试题
关于室间隔缺损的心脏听诊,以下哪项是错误的
惰性气体与氧化性气体的混合气体的主要作用是()。
关于银行存款日记账有关叙述正确的包括()。
单位内部会计监督,可通过()在处理会计业务过程中进行。
甲公司拟购买一台大型生产设备,于2007年6月1日与乙公司签订一份价值为80万元的生产设备买卖合同。合同约定:(1)设备直接由乙公司的特约生产服务商丙机械厂于9月1日交付给甲公司;(2)甲公司于6月10日向乙公司交付定金16万元;(3)甲公司于设备交
下列诗句,与中国和西域的物质文明交流无关的一组是()。
《糖果仙子舞曲》选自芭蕾舞剧()。
公民必须依照《中华人民共和国集会游行示威法》行使自己的集会、游行、示威权利,这是对公民政治自由权利的限制。这种观点()。①认为公民应无拘无束地行使政治自由权利②认为法律和自由是统一的③主张公民在法律范围内行使政治自由权利④割裂了自由和法律
斯滕伯格的成功智力,就是指用以达成人生主要目标的智力,它能使个体以目标为导向并采取相应的行动,不包括()
下面哪些是调用一个类的方法时不需要知道的信息()。
最新回复
(
0
)