问题 问答题

(1)在“测定匀加速直线运动的加速度”实验时,打出纸带的一部分,如图1,每个计数点间还有四个点未画出,测定S1=4.29cm,S2=5.79cm,S3=7.30cm,S4=8.78cm,则该小车加速度为______m/s2

(2)某同学在“探究加速度与力的关系”实验中,保持物体的质量不变,改变物体所受合外力的大小,得到的a-F图象如图2所示,由此得出的结论是:______.

答案

由于每相邻两个计数点间还有4个点没有画出,所以相邻的计数点间的时间间隔T=0.1s,

根据匀变速直线运动的推论公式△x=aT2可以求出加速度的大小,得:

S3-S1=2a1T2

S4-S2=2a2T2

为了更加准确的求解加速度,我们对两个加速度取平均值得:

a=(a1+a2

即小车运动的加速度计算表达式为:

a=

X24-X02
4T2
=
0.073+0.0878-0.0429-0.0579
0.04
m/s2=1.50m/s2

(2)由图可知a与F成正比,结合给定的条件,由此得出的结论是在m一定时,a与F成正比.

故答案为:(1)1.50;(2)在m一定时,a与F成正比.

单项选择题

The telecommunications, pharmaceutical, and airline industries all have undergone radical changes in recent years. Pharmaceutical companies, which once sold drugs to the doctors that dispensed them, switched to the solution-selling method and started dealing with health-care companies. And many major airlines consolidated at the same time that low-cost firms like Jet Blue entered the market.

In each of these industries, the game changed, and with new rules came new ways to win. That is the premise of Harvard Business School’s "Changing the Game. Negotiation and Competitive Decision Making." The program, which covers not only deal-making but also topics as diverse as online auctions and strategic partnerships, "is for companies that are going through fundamental change in the way things are done," says Max Bazerman, program chair and professor of business administration at the school.

This is not a program for novices, says Bazerman; most participants have already attended a general negotiation program. In "Changing the Game," participants learn to understand their thought processes regarding negotiation, to compare rational and intuitive decision-making strategies, and to identify common mistakes made by even the most experienced professionals. By focusing on competitive environments, the program draws on some of the most advanced concepts from the emerging areas of behavioral economics, behavioral decision research, and behavioral finance.

Participants engage in simulated negotiations that highlight the tension between creating and assessing value, and learn how to think about both simultaneously. The soup-to-nuts simulations encompass preparation, team building, negotiating, and feedback, as well as the development of a conceptual structure for thinking about negotiations more rationally. Participants then apply that structure in their critiques of several large-scale negotiation cases. Ultimately participants apply their newly-honed analytic skills to their own companies and critique of past negotiations.

Negotiations can take many forms, of course. Bazerman notes that auctions are becoming increasingly common. Thanks to a renewed focus on driving clown costs, auctions have emerged as a valuable way for buyers to exert maximum leverage (although the course offers advice to sellers as well). Here again, coursework focuses both on analysis of case studies and on simulations that give participants a chance to roll up their sleeves and put themselves to the test.

"Max’s approach is more pragmatic than other programs I’ve taken," says Gerry Dully, senior vice president of global marketing and logistics at Methanex, a producer of methanol based in Vancouver. "Looking at my prior experience, I could see what mistakes I made, and I’m more conscious of them now. The course had a profound impact on how I’ve modified my behavior in negotiating situations.

Gerry Dully is()

A. a friend of the program chair Max Bazerman

B. a participant in the program

C. a professor who teaches at the program

D. a company leader who is an expert in negotiation

单项选择题 A1/A2型题