问题 问答题

某同学用一只弹簧测力计做研究弹簧的伸长与所受的拉力关系的实验,具体记录数据如下表:

拉力/N1234567891011
弹簧长度/cm6.07.08.09.010.011.012.013.1014.3015.5616.20
(1)根据实验数据,能制成一个测量范围是多大的弹簧测力计?理由是什么?

(2)当悬挂某物体时,弹簧长度为8.5cm,问该物体对弹簧的拉力是______N.

答案

(1)分析实验数据可得拉力为1.0N时,弹簧的长度为6cm;一直到拉力为5N时,都是弹簧的受到的拉力增加1N,弹簧就伸长1cm.

由此可得当因此当拉力为0N时,弹簧的长度为5cm;由此还可以得到在该范围内,弹簧的伸长与受到的拉力成正比;该弹簧测力计的范围是0~5N.

(2)在弹性限度范围内,弹簧的伸长与受到的拉力成正比,由表中数据可求出弹簧的劲度系数k=

F
x
=
5N
10cm-5cm
=1N/cm.因此当用手将弹簧拉到8.5cm长时,手对弹簧的拉力:F=kx=1N/cm×(8.5cm-5cm)=3.5N.

故答案为:(1)0~5N;在这个范围内,弹簧的伸长量跟受到的拉力成正比.(2)3.5.

阅读理解

Are you a team person? Are you at your best as part of a small, tightly united group of dedicated workers? If so, the future may hold more for you than you think.

High technology, some predicted, would make team work a thing of the past. That’s happening in those areas of business and data processing where one person and a computer can replace a team of workers.

But, elsewhere, teamwork is very much alive. High technology has led to a new type of teamwork in a number of fields, including advertising, scientific research, engineering design, architecture and ocean exploration. Through computer networking, scientists, engineers and technicians at different locations---often thousands of miles apart---can work on the same project at once. They can exchange ideas, try out different designs and test their results.

Examples? An engineering team can now design and try out a robot system, a new manufacturing process, or an entire factory before it is built. An architectural team can do the same with a building or a bridge. A medical team can simulate (模拟) a dangerous operation before performing it on a patient.

Of course, computer–assisted team effort doesn’t end with investigation and simulation. It now usually continues into actual design, manufacturing and testing. “Computer–aided design (CAD) and computer–aided manufacture (CAM) are breaking down barriers between traditional design and manufacturing functions,” explains Dr. Prakash Rao, an engineering manager at General Electric. “Interdisciplinary teams and engineers follow a product from concept to production. Everything is interconnected like a network.”

Sometimes a computer–aided effort can extend beyond production. A team that produces robots may use them to explore space and ocean depth. For high–technology team work, the future seems limitless.

小题1:The underlined part “hold more” most probably means to          .

A.maintain more chances

B.give more rights

C.make more regulations

D.store more information小题2:According to the passage, the writer believes that         .

A.teamwork requires more use of computers than that of human beings

B.teamwork will be completely replaced by computers

C.the concept of teamwork is still alive and no longer the same as the past

D.high technology would make teamwork a thing of the past小题3:The examples given by the writer in Paragraph 4 serve           .

A.to prove high technology has a promising future

B.to explain his idea of new type of teamwork is reasonable

C.to show that it tends to be an end to teamwork soon

D.to indicate the computer—assisted team effort just means investigation and simulation.小题4:Which of the following statements is NOT true according to the passage?

A.Many fields of science and technology are now using computers effectively.

B.No details are given in the passage about barriers between traditional design and manufacturing functions.

C.Experts from different fields have to cooperate to develop a product from concept to production.

D.High technology is nothing but a new type of teamwork plus CAD and CAM.小题5:The author’s attitude to towards the introduction of the computer to teamwork is of         .

A.objection

B.indifference

C.support

D.doubt

单项选择题