题目

在做“用单摆测定重力加速度”的实验中，某同学先测得摆线长为92.50 cm，然后用秒表记录了单摆做45次全振动的时间，摆球的直径和秒表的读数如图所示，该单摆的摆长为______cm，单摆的周期为______s. 答案：【答案】93.5151.95【解析】(1)球的直径：主尺：2.0 cm，游标尺对齐格数：第6个格，读数：6×＝0.30mm＝0.030cm，所以直径为：2.0＋0.030＝2.030cm；摆长：L＝绳长＋小球半径＝92.50＋1.015＝93.515cm。(2)秒表读数：内圈：1.0min＝60 s，外圈：27.5 s，所以读数为：87.5 s，单摆的周期为。We are travel agents based in Holland and we sell very cheap tickets to destinations all over the world.If you are looking for effciency, just contact us. Also ,we are looking for manufacturing companies to represent. So, if you are a manufacturer and looking for a representative,We will be glad to represent you in Holland.Contact InformationContact Person: Mr O. EmmanuelJob Title:Director/CEO/General ManagerAdress:J.V.Offwegenlaan 62, Rijswijk, NetherlandsPostal Code:2282HSTelephone: +31—65—3202073Fax:+31—70—N/AWebsite:http//www.timpextravel.com NO.2 Are you tired of booking hotel and flight tickets when you go to China?Are you worried of being cheated by dishonest travel agents?Now ,we are here to support you. We are a professional business service company who can help you to schedule your business trips to China.We have wide connections with hotels and airlines in China,and can help reduce your founding expenses.Our service include booking hotels and flights before you leave for China.We will give you all the information you need before you come to China, pay your room fee in hotel counter and make you get your flight ticket in your hotel room. Our service  is free of charge until you are satisfied. This means you can pay us when you wish, even after your trip to China is over. If you think that our service was not satisfactory, you do not pay anything. What you need to do is to give us your personal information—the name shown in your passport ,your passport number, and your date of birth, We also need to know the details of your trip such as your destionation,when and where you are going,and which kind of hotels you need.Contact InformationContact Person:Ms Dana LiJob Title:ManagerAddress:Room 303 ,Jina Building, No. 122 Jingba, Ji’nan,Shangdong,ChinaPostal Code:25001Telephone:+86—531—88341698Fax:+86—531—820703961.If you are travelling around Gambia, how many ways will you contact the travel agent? A.One     B.Two      C.Three     D.Four2.The second advertisement is meant for___________ A.tourists in China       B.tourists to China from overseas B.both home tourists and foreign travellers  D.American travellers only3.If you hire the company in the second advertisement, what do you have to pay them? A.You can pay them any time as you wishB.Even if you think their service was unsatisfactory ,you must pay for everythingC.You must pay before getting the serviceD.You must pay before you finish your trip in China and back to your home4.If you are from Japan and want to visit Shanghai, you can fax________to get a ticket to China A.+86—531—82070396     B.+31—70—N/AC.+86—531—88341698     D.+31—65—3202073