题目

一位同学要研究轻质弹簧的弹性势能与弹簧长度改变量的关系，他的实验如下：在离地面高度为h的光滑水平桌面上，沿着与桌子边缘垂直的方向放置一轻质弹簧，其左端固定，右端与质量为m的一小钢球接触.当弹簧处于自然长度时，小钢球恰好在桌子边缘，如图所示.让小钢球向左压缩弹簧一段距离后由静止释放，使钢球沿水平方向射出桌面，小球在空中飞行后落到水平地面上，水平距离为s. （1）请你推导出弹簧弹性势能Ep与小钢球质量m、桌面离地面    Holiday Inns and McDonald’s both saw unmatched growth in the 1960s. Their growth opened another direct business operation—franchising (特许经营).     These operations have the same general pattern. The franchisor, the parent company, first establishes a successful retail (零售) business. As it expands, it sees a profit potential in offering others the right to open similar business under its name. The parent company’s methods and means of identification with consumers are included in this right. The parent company supplies skill, and may build and rent stores to franchisees. For these advantages the franchisee pays the franchisor a considerable fee. However, some of the advantages and disadvantages are different.     By extending a “proven” marketing method, a parent can profit in several ways. First, the franchisee’s purchase price gives the parent an immediate return on the plan. Then the sale of supplies to the franchisee provides a continuing source of profits. As new businesses are added and the company’s reputation spreads, the value of the franchise increasesお and sales of franchises become easier. The snowballing effect can be dramatic. Such growth, too, brings into play the economies of scale (规模经济). Regional or national advertising that might be financially impossible for a franchisor with 20 franchises could be profitable for one with 40.     The parent, then, finds immediate gains from the opportunity to expand markets on the basis of reputation alone, without having to put up capital or take the risk of owning retail stores. Added to this advantage is a less obvious but material one. Skilled, responsible retail managers are rare. People who invest their capital in franchises, though, probably come closer to the ideal than do paid managers. In fact, the franchisee is an independent store operator working for the franchisor, but without an independent’s freedom to drop supplies at will. Of course the factory’s costs of selling supplies are less. But also certainly the franchisee buying goods that have had broad consumer acceptance will not casually change supplies, even when the contract permits. If the hamburger is not what the customer expected, they may not return.  Having paid for the goodwill, the franchisee won’t thoughtlessly destroy it.     Franchising may give you the idea that as a franchisor, you need only relax in the rocking chair. Franchising, however, has problems to be solved. 1. Franchising refers to a business operation in which a successful parent company ______. A. sells name-brand goods to a private investor B. rents proven ideas and techniques for investment C. sells the right, the guidance to a business under its name D. takes no advertising responsibility for individual investors 2. The advantages of franchising to the parent company are all the following EXCEPT ______. A. an immediate investment return B. the ownership of additional retail stores C. the profit from the sale of supplies D. the possibility of profitable advertising 3. The passage mainly tells the reader _______. A. the advantages and disadvantages of franchising B. the benefits of franchising to the franchisor C. the unmatched economic growth in the 1960’s D. some regional and national business operation 4. What will the author probably discuss after the last paragraph? A. More advantages of franchising. B. Risks of investment besides franchising. C. The standard of consumer acceptance. D. Negative aspects related to franchising.