您所在的当前位置：高中物理试题 >

匀变速直线运动

> 在离坡底L的山坡上竖直固定长也为L的直杆AO，A端与坡底B间连有一钢绳，钢绳处于伸直状态，一穿心于钢绳上的小球从A点由静止开始沿钢绳无摩擦地滑下，如图所示，则小球在钢绳上的滑行时间为（） A． B． C． D．条件不足，无法解答

问题：

发布时间：2024-09-07

在离坡底L的山坡上竖直固定长也为L的直杆AO，A端与坡底B间连有一钢绳，钢绳处于伸直状态，一穿心于钢绳上的小球从A点由静止开始沿钢绳无摩擦地滑下，如图所示，则小球在钢绳上的滑行时间为（）

A． B．

C． D．条件不足，无法解答

参考答案：

提问用户：jo***O2r

可能感兴趣的题目：

1 完形填空。 My friend Michelle is blind, but you"d never know it. She makes such good use of her other 1 , including her "sixth sense", that she rarely gives the impression she"s 2 anything. Michelle looks after her children pretty much like the rest of us, 4 that she doesn"t push too hard on them, 3 really benefit a lot from her relaxed attitude. She knows when to clean the house. She moves around so fast that often 5_don"t realize she"s blind. I _6 this the first time after my six-year-old daughter, Kayla, went to play there. When Kayla came home, she was very 7 about her day. She told me they had baked cookies, played games and done art projects. But she was _8 excited about her finger-painting project. "Mom, guess what?" said Kayla, all smiles. "I learned how to _9 colors today! Blue and red make purple, and yellow and blue make green! And Michelle 10 with us. To my great 11 , my child had learnt about color from a blind friend! Then Kayla continued, "Michelle told me my 12 showed joy, pride and a sense of accomplishment. She really 13 what I was doing!" Kayla said she had never felt how good finger paints felt 14 Michelle showed her how to paint without looking at her paper. I realized Kayla didn"t know that Michelle was blind. It had just never _15 in conversation. When I told her, she was 16_ for a moment. At first, she didn"t believe me. "But Mommy, Michelle knew exactly what was in my picture!" Kayla 17 . And I knew my child was 18 because Michelle had listened to Kayla describe her artwork. Michelle had also heard Kayla"s 19 in her work, We were silent for a minute. Then Kayla said slowly, "You know, Mommy, Michelle really did "see" my picture. She just used my 20." Indeed, she uses a special type of "vision" that all mothers have. ( )1. A. ways ( )2. A. enjoyed ( )3. A. and ( )4. A. who ( )5. A. guests ( )6. A. realized ( )7. A. excited ( )8. A. especially ( )9. A. paint ( )10. A. stayed ( )11. A. excitement ( )12. A. attitude ( )13. A. touched ( )14. A. after ( )15. A. referred to ( )16. A. curious ( )17. A. cried ( )18. A. right ( )19. A. shortcomings ( )20. A. paper B. means B. found B. except B. it B. family B. heard B. sad B. not so B. draw B. painted B. encouragement B. color B. distinguished B. unless B. turned out B. quiet B. insisted B. wrong B. difficulties B. pens C. methods C. missed C. even C. she C. boys C. recognized C. satisfied C. a little C. create C. talked C. delight C. picture C. saw C. until C. come up C. excited C. complained C. worried C. pride C. hands D. senses D. lost D. but D. which D. friends D. witnessed D. enjoyed D. not at all D. mix D. played D. surprise D. paper D. understood D. when D. talked about D. worried D. informed D. uncertain D. description D. eyes
2 (12分) 已知，，，． (1) 当时，求使不等式成立的 x的取值范围； (2) 当 m﹥0时，求使不等式成立的 x的取值范围．
3 It was at 10 o’clock last night ________ the visitors finally arrived at Zunyi Airport. A．when B．that C．before D．after
4 如图所示的程序框图输出的值是______．
5 In the supermarket foreign names of the products got_______, and I was confused about what to buy. A．picked up B．showed up C．mixed up D．fixed up
6 为了加强欧洲各国之间的政治和经济联系，这里成立了一个区域性国际组织是 A.欧佩克 B.北约 C.欧盟 D.世贸组织
7 阅读理解。 A British train station has put up a no kissing sign to stop lovers going full steam ahead with their overamorous farewells. Commuters (通勤者,每日往返上班者) have been told: if you want to get up to that kind of business, do it in the car park. The sign has been put up at the dropoff point (落客处) at Warrington Bank Quay station in the town of Warrington, between Liverpool and Manchester in northwest England. A similar sign, this time permitting kissing, has been put up elsewhere in a zone where kissing is considered tolerable. "We have not banned kissing in the station," said a spokesman for operators Virgin Rail. "But we have put the sign up at the dropoff point because it is not a very big area and it often gets busy. The sign is a lighthearted way of reminding people to move on quickly. If people wish to spend a little more time with their loved ones before they leave, then they should park in the shortstay car park nearby." The busy station links the town with the major cities London, Birmingham,Glasgow, Edinburgh, Liverpool and Manchester. However,one station is trying to rescue love from the tracks. High Wycombe,northwest of London, is having none of it and is actively urging commuters to show their emotions in public. "Kissing is welcome here!...we would never dream of banning kissing," says a poster of a cartoon couple embracing, framed by a pink heart. "Railway stations are romantic places," insisted Kirsteen Robertson from Chiltern Railways. "They are where fond farewells and emotional reunions take place, where relationships start with a glance and even, in the case of our Marylebone station last November where one passenger will propose (求婚) to another over the public address system." "So our passengers are more than welcome to share a kiss in our stations." 1. The train station has put up a no kissing sign in order to _____. A. ban kissing in the station B. get passengers to walk quickly C. avoid embarrassment D. prevent illegal practice 2. The underlined word "it" here refers to _____. A. rescuing love from the tracks B. banning kissing in the station C. farewell kisses between lovers D. kissing in the car park 3. We learn that in High Wycombe _____. A. kissing is encouraged B. kissing is forbidden C. kissing is intolerable D. kissing is limited to a certain time 4. We can infer that _____. A. the dropoff point is not a safe place B. the dropoff point is a quiet place C. the dropoff point is a romantic place D. the dropoff point is often packed with the traffic and passengers
8 图为某国一农场2010年的工作历，作物熟制一年一熟，请根据图中资料，回答以下13-14题。小题1:该农场位于(　　) A．荷兰西欧平原 B．阿根廷潘帕斯草原 C．加拿大中部平原 D．泰国湄公河平原小题2:从图中可以看出，影响该地区农业发展的主要不利因素为(　　) A．热量不足 B．水源不足 C．劳动力不足 D．土壤贫瘠
9 (10分)下图所涉及的物质中，C、D、E均为单质，且E为日常生活中常见金属，其余均为化合物。它们之间的转化关系如图所示(反应中生成的水及次要产物均已略去)。请回答： (1)写出有关物质的化学式 A ，F ，H 。 (2)指出MnO 2在相关反应中的作用：反应①中是剂，反应②中是剂。 (3)若反应①是在加热条件下进行，则A是 (填化学式)。 (4)写出反应②的化学方程式。 (5)向G中加入NaOH溶液，观察到的现象为。
10 地球同步通讯卫星“在高空中静止不动”，应选择下列哪个物体为参照物？ A.地球 B.太阳 C.月亮 D.火星