2020-2021学年人教版(2019)选择性必修第一册Unit 2同步练习
选择性必修一Unit 2 Looking into the Future同步练习（答题时间：40分钟）一、阅读理解Faison worked in the state of Florida as a lawyer for large companies until 2012, when he moved to Virginia to start a farm business. But now, instead of raising crops, he is raising the earnings of local farmers.Faison seems at ease with life on a farm. Members of his family have been farming for many years. When his grandparents died, he and his brothers and sisters inherited their farm. He says that began the process of trying to decide what they were going to do with it.Four years ago, Faison left his job as a lawyer in Miami and returned to the family farm in Virginia. Slowly, he began to learn about the economic issues farmers face.“A lot of small farmers are struggling. And they’re working very hard, but they’re not able to drive the income from farming to make it economically viable.”Faison said he met with several farmers who raise animals naturally-in other words, they do not give them hormones (激素) or antibiotics (抗生素).After the meetings, Faison created a company called Milton’s Local，named for his grandfather. Today, his work day is very different from his work as a lawyer.Milton’s Local sells and transports all-natural meat from local farms to stores and restaurants. Faison says the company helps farmers increase their earnings, supports the local economy and satisfies the buyers of these meat products.Milton’s Local products have been sold at the Arlington store for more than a yean People like the products, not just because they are natural but because they come from local farms.That is good news for James Faison. He now works with more than 30 small farms in Virginia and North Carolina. He hopes Milton’s Local will expand，become more profitable and help more small farmers.1. Why did Faison abandon his job as a lawyer?A. Because he was tired of being a lawyer.B. Because he was attempting to do something with their family farm.C. Because his grandparents asked him to help on their family farm.D. Because he was worried about his brothers and sisters to inherit their farm.2. What problem did Faison find about farmers?A. Farmers can’t make great profits in farming.B. Farmers can’t spend m uch on food.C. Farmers can’t struggle on their farms.D. Farmers can’t feed animals naturally.3. Faison set up the Milton’s Local to _____________.A. help increase his earningB. save the local economyC. make a good bridge between customers and farmersD. help farmers sell their products4. Where can we find this passage?A. In a poster.B. In a novel.C. In a history book.D. In a life magazine.二、语法填空In the Chinese lunar calendar a year ____5____ (divide) into 24 solar terms. Lichun, the first solar term, usually lasts from around February 4 to February 18. It is time to actively develop agriculture. Lichun ____6____ (tradition) represents the beginning of spring in East Asian cultures. Farmers often celebrate it with special village events and ____7____ (ceremony) for a prosperous new year. In the lunar calendar, New Year’s Day might be before ____8____ after Lichun.In northern China, people ate spring pancakes on this day. The spring pancake took ____9____ (it) rise from the Jin dynasty and ____10____ (become) popular in the Tang dynasty. Lichun was valued by both Chinese ancient kings and civilians. In celebration of Lichun, civilians ate spring pancakes ____11____ (wrap) around fresh vegetables and meat, ____12____ was called bite-the-spring. Bite-the-spring implied that civilians were praying for ____13____ good harvest year.Now, people also go outside to show their passion for the spring. Villagers usually whip their cattle and on their way, they bang drums and sing songs 70. (celebrate) the coming spring.三、写作当今社会中，人们已经意识到，重要的是保持健康和良好的生活习惯。
人们对于饮食健康也越来越重视。
请以GoodEatingHabitsandHealth为题目，写一篇关于好的饮食习惯与健康的作文。
请涵盖以下要点：1. 健康的饮食习惯对我们来说很重要；2. 过去，人们生活水平不好，吃的垃圾食品较少，所以很健康。
现在，我们应当多吃蔬菜少吃肉，少吃垃圾食品；3. 足够的锻炼对我们的身体来说非常的重要，我们应当多运动。
注意：1.内容连贯，语法正确；2.字数100字左右。
选择性必修一Unit 2 Looking into the Future同步练习参考答案一、1. B 解析：细节理解题。
根据第二段When his grandparents died, he and his brothers and sisters inherited their farm. He says that began the process of trying to decide what they were going to do with it.可知，父母去世后，Faison和兄弟姐妹继承了农场，这促使他们考虑如何处置农场，最终他才做出回到农场的决定。
2. A 解析：细节理解题。
根据第四段but they’re not able to drive the income from farming to make it economically viable.可知，农户们并不能通过种地赚到很多钱。
3. C解析：细节理解题。
根据倒数第三段Milton’s Local sells and transports all-natural meat from local farms to stores and restaurants.可知Faison创建公司的目的在于在农户和消费者搭建起桥梁。
高中英语人教版必修第一册Unit 2 Reading and Thinking 同步练习
同步练习Part II Reading and Thinking基础知识练Ⅰ.单词拼写1. The b（小册子）offers a wide choice of hotels，apartments and holiday homes.2. One of the easiest ways to save money on college application fees before you begin applying is ton（使变窄，缩小）down your list of schools.3. It should be clearly written and include your postcode and your house or f（公寓）number.4. In keeping with tradition，the E（皇帝）and Em-press did not attend the ceremony.5. We just set the d（目的地）information on it，and then it takes off，and lands by itself.6. Scientists have described the Aral Sea as the s（地点）of the worst ecological disaster on earth.7. On arriving at the tea house，the foreign students were impressed by the u（独特的）tea pots and tea cups.8.It’s no secret that China has always been a s（来源）of inspiration for designers.Ⅱ. 根据汉语提示完成句子1. The Oxford is the most ambitious dictionary （在……的历史上）the English language.2. Above all，believe in yourself and your ability to （控制）your health and your future.3. Apples are （充满；富含）fiber and water，so your stomach will want less.4.“Alien” is a word used to refer to a person or creature from a planet （除了……以外）Earth.5.We all know the theory that matter （由……组成）atoms and molecules.6.The key to successful small talk is learning how to （与……联系）others，not just communicate with them.Ⅲ. 单句语法填空1. Parents and coaches are （power）teachers because children usually look up to them.2. It is illegal for a public （office）to ask people for gifts or money in exchange for favors tothem.3. He （contact）several fellow workers and organised a trade union group.4. It is reported that this interesting and charming creature is unique this small island.5. Scientist Susan Hough said earthquakes produce two （type）of waves—a weak“P”wave and then a much stronger “S” wave.6. But doing any ordinary job as well as one can is in itself an （admire）commitment.Ⅳ. 练通句型【一句多译】1.黄河是中国人民公认的母亲河。
2020～2021学年人教版(2019)选择性必修一章节2.1.2 影响化学反应速率的因素(二)
2020—2.1.2 影响化学反应速率的因素（二）1.某温度下，体积一定的密闭容器中进行如下可逆反应：X(g)＋Y(g)Z(g)＋W(s)；H >0下列叙述正确的是()A．增大升高温度，平衡逆向移动B．当容器中气体压强不变时，反应达到平衡C．加入少量W，逆反应速率增大D．平衡后加入X，上述反应的ΔH增大2.下列哪些是影响化学反应速率的主要因素( )A.压强B.温度C.催化剂D.反应物的性质3.把下列四种盐酸溶液分别加入四个盛有20mL 1mol/L的KOH溶液的烧杯中，均加水稀释到100mL，此时反应最快的是（）A. 20℃ 20mL 3mol/L的盐酸B. 25℃ 30mL 2mol/L的盐酸C. 25℃ 10mL 5mol/L的盐酸D. 20℃ 10mL 2mol/L的盐酸4.对于密闭容器中进行的反应N 2(g)+O2(g)2NO(g),下列条件能加快其反应速率的是( )A.增大体积使压强减小B.体积不变,充入N2使压强增大C.体积不变,充入He使压强增大D.压强不变,充入气体Ne5.一定温度下用铁块与稀硫酸反应制取氢气，采取下列措施，①将铁块换成等质量的铁粉；②将稀硫酸换成浓硫酸；③加热；④加入少量KNO3固体；其中能够加快氢气产生速率的是( )A．①③④B．②④C．②③D．①③6.常温下，分别将四块形状相同、质量均为7 g的铁块同时投入足量下列四种溶液中。
铁块最快溶解完的是( )A.250.0 mL 21H SO溶液mol L-mol L-盐酸 B.150.0 mL 2124C.40.0 mL 51H SO溶液mol L-mol L-盐酸 D.20.0 mL18.41247.下列说法不正确的是( )A.加入正催化剂，活化分子百分数增大，化学反应速率一定增大B.熵增且放热的反应是自发反应C.任何条件下，化学反应的焓变都等于化学反应的反应热D.常温下硝酸铵能够溶于水，因为其溶于水是一个熵增大过程8.对可逆反应 2A（s）+3B（g）⇌C（g）+2D（g）△ H＜0，在一定条件下达到平衡，下列有关叙述正确的是（）①增加 A 的量，平衡向正反应方向移动②升高温度，平衡向逆反应方向移动，v 正减小③缩小容器体积，平衡不移动，v 正、v 逆增大④增大 B的浓度，v 正＞v 逆⑤加入催化剂，平衡向正反应方向移动。
2020-2021学年度人教版(2019)选择性必修第一册 2.4单摆 同步训练2(含解析)
2020-2021学年度人教版（2019）选择性必修第一册2.4单摆同步训练2（含解析）1．下列说法正确的是（）A．在同一地点，单摆做简谐振动的周期与其摆长成正比B．弹簧振子做简谐振动时，振动系统的势能与动能之和保持不变C．在同一地点，当摆长不变时，摆球质量越大，单摆做简谐振动的周期越小D．已知弹簧振子初始时刻的位置及其振动周期，就可知振子在任意时刻运动速度的方向2．一个单摆，在第一个行星上的周期为T1，在第二个行星上的周期为T2，若这两个行星的质量之比为M1∶M2=4∶1，半径之比R1∶R2=2∶1，则（）A．T1∶T2=1∶1 B．T1∶T2=4∶1C．T1∶T2=2∶1 D．T1∶T2=1∶23．要增加单摆在单位时间内的摆动次数，可采取的方法是（）A．增大摆球的质量B．缩短摆长C．减小摆动的角度D．增大摆长4．把在北京调准的摆钟，由北京移到赤道上时，摆钟的振动()A．变慢了，要使它恢复准确，应增加摆长B．变慢了，要使它恢复准确，应缩短摆长C．变快了，要使它恢复准确，应增加摆长D．变快了，要使它恢复准确，应缩短摆长5．关于小孩荡秋千，以下说法正确的是：（）A．质量越大的孩子荡秋千时摆动的频率越大B．秋千到达最低点时，孩子会有失重的感觉C．拉绳被磨损了的秋千，每当摆到最高点时拉绳最容易断裂D．要想越荡越高，应该在摆到最高点时站立起来，提高重心增加势能6．半径为R的光滑球面，已知圆弧AB<<R，且A、B等高，其中B点和圆弧最低点之间由光滑斜面相连，现有三个小球，A球从A点从静止释放沿圆弧下滑，B球从B点从静止释放沿斜面下滑，C球从圆心O点由静止释放，若三个小球同时释放，则下列说法正确的是（）A．A球最先运动到圆弧最低点B．B球最先运动到圆弧最低点C．C球最先运动到圆弧最低点D．三个小球同时到达圆弧最低点7．质量相同的甲、乙两小球用细线系于同一根水平杆上，两小球做简谐运动的图像如图所示，则（）A．两小球经过平衡位置时速度一样大B．运动过程中最大加速度甲的大C．两小球摆动过程中最大摆角乙的大D．运动过程中甲的机械能小于乙的机械能8．某同学测得一单摆的摆线长为89.2cm，摆球直径为1.6cm，取重力加速度大小2g=，则此单摆在摆角小于5︒时完成1次全振动的时间约为（）10m/sA．0.9s B．1.9s C．2.8s D．3.8s9．一单摆由甲地移到乙地后,发现走时变快了,其变快的原因及调整的方法是() A．g甲>g乙,将摆长缩短B．g甲<g乙,将摆长放长C．g甲<g乙,将摆长缩短D．g甲>g乙,将摆长放长10．一光滑圆弧面ABD，水平距离为L，高为h（L>>h），小球从顶端A处静止释放，滑到底端D的时间为t1，若在圆弧面上放一块光滑斜面ACD，则小球从A点静止释放，滑到D 的时间为t 2，则（ ）A ．t 2=t 1B ．212t t =C ．214t t π= D ．213t t =11．单摆在摆动过程中，下列说法正确的是（ ）A ．回复力由重力和细线拉力的合力提供B ．摆动到最低点时回复力为零C ．动能变化的周期等于振动周期D ．小球质量越大，周期越长12．如图，大小相同的摆球a 和b 的质量分别为m 和3m ，摆长相同，并排悬挂，平衡时两球刚好接触，现将摆球a 向左边拉开一小角度后释放，若两球的碰撞是弹性的，下列判断正确的是 （ ）A ．第一次碰撞后的瞬间，两球的速度大小不相等B ．第一次碰撞后的瞬间，两球的动量大小相等C ．第一次碰撞后，两球的最大摆角相同D ．发生第二次碰撞时，两球在各自的平衡位置13．将一个电动传感器接到计算机上，就可以测量快速变化的力，用这种方法测得的某单摆摆动时悬线上拉力的大小随时间变化的曲线如图所示。
2021版高中英语【新教材】人教版必修第一册unit 2 同步练习 (含解析)
unit 2 理解·课文精研读Ⅰ.单词拼写1．Many new words and phrases(短语) have been included in the revised edition.2. He remained distant(疏远的) from the people he worked with.3. At night I like to look at the remote(遥远的) stars in the clear sky.4. The movements of machines are completely automatic(自动的), you only need to start and stop the machines.5. They have lived in this country for ten years, but have never really integrated(融为一体)．6. What you said was true but nevertheless(不过) unkind.7. These tickets are available(可用的) for one month.8. She had woven a whole fantasy(幻想) about living in a cottage by the sea.9. Each of the homes has a security system and is wired(用电线连接) for cable television.10. He has received many honours for his research into cancer(癌)．Ⅱ.阅读AWelcome to your future life!You get up in the morning and look into the mirror.Your face is young-looking.In 2035, medical technology is better than ever.Many people could live to be 150, so at 40, you're not old at all.And your parents could have an antiaging treatment.Now, all three of you look the same age!You say to your shirt, “Turn red.”It changes from blue to red.In 2035, “smart clothes”contain particles(粒子) much smaller than the cells in your body.The particles can be programmed to change your clothes' color or pattern.You walk into the kitchen.You pick up the milk, but a voice says, “You shouldn't drink that！” Your fridge has read the chip(芯片) that contains information about the milk and it knows the milk is bad.In 2035, every kind of food in the grocery store has such a chip.It's time to go to work.In 2035, c ars drive themselves.Just tell your “smart car”where to go.On the way, you can call a friend using your jacket sleeve.Such “smart technology”is all around you.So will all these things come true？“For new technology to succeed，”says a scientist called Andrew Zolli, “it has to be so much better that it replaces what we already have.”The Internet is one example—what will be the next?【语篇解读】本文主要对未来技术在我们的日常生活中的运用进行了展望，描绘了几种未来技术将如何影响我们的日常生活的画面。
2021年高中英语(新教材)人教选择性必修第一册同步练习：Unit 2 Section A Reading and Thinking
Unit2LOOKING INTO THE FUTURE Section A Reading and Thinking课后篇素养升华基础训练Ⅰ.单词拼写1.I just want you to answer the question in a concrete and believable (短语).2.Her father tried to p her to go back home with him,but in vain.3.Mary told me that she spent her childhood in the r mountain area.4.It is said that this heating system has an a temperature control.5. (使融合) the kids with the community as well as finding them a role,is essential.6.They include the floor exercises as a regular part of their fitness (常规).7.The Official Guide App is (可获得的) for free in both the App Store and Google Play.8.We have suffered a serious setback.N,we must not be discouraged.Ⅱ.短语填空1.The central heating had been and the room was as cold as ice.2.,I am more in awe of Confucius than ever before.3.Team members get gratification and valuable learning experiences.4.,you’d better bring some gifts,such as a book or a Chinese knot.5.With eleven thousand employees,it’s very difficult to them all.6.That wooden house on top of the hill because it was hit by lightning.Ⅲ.完成句子1.你离开教室时,不要忘了关电灯。
2020-2021学年新人教版高中数学选择性必修第一册第二章《直线与圆》
第 1 页 共 4 页2020-2021学年新人教版高中数学选择性必修第一册第二章《直线与圆》1．点A (2,0,3)在空间直角坐标系中的位置是( ) A ．在y 轴内 B ．在xOy 平面内 C ．在xOz 平面内D ．在yOz 平面内解析：选C 点A (2,0,3)的纵坐标为0，所以点A 应在xOz 平面内．2．若直线l ：(m 2－2m －3)x ＋(2m 2＋m －1)y －2m ＋6＝0的斜率为1，则实数m 的值为( )A ．－1 B.43 C ．－1或43D ．1或12解析：选B 由直线的斜率为1，得⎩⎪⎨⎪⎧2m 2＋m －1≠0，－m 2－2m －32m 2＋m －1＝1，解得m ＝43，选B.3．过圆x 2＋y 2－4x ＝0外一点(m ，n )作圆的两条切线，当这两条切线相互垂直时，m ，n 满足的关系式是( )A ．(m －2)2＋n 2＝4B ．(m ＋2)2＋n 2＝4C ．(m －2)2＋n 2＝8D ．(m ＋2)2＋n 2＝8解析：选C 圆x 2＋y 2－4x ＝0的圆心坐标为(2,0)，半径r ＝2.由题意，知(m －2)2＋n 2＝8.4．光线从点A (－3,5)射到x 轴上，经反射后经过点B (2,10)，则光线从A 到B 的距离是( )A ．5 2B ．2 5C ．510D ．10 5解析：选C 根据光学原理，光线从A 到B 的距离，等于点A 关于x 轴的对称点A ′到点B 的距离，易求得A ′(－3，－5)．所以|A ′B |＝(2＋3)2＋(10＋5)2＝510.5．直线y ＝x ＋b 与曲线x ＝1－y 2有且仅有一个公共点，则b 的取值范围是( ) A ．|b |＝ 2 B ．－1<b ≤1或b ＝－ 2 C ．－1≤b ≤1 D ．非A ，B ，C 的结论。
2020-2021学年度人教版(2019)选择性必修第一册 2.2简谐运动的描述 同步训练(含解析)
2020-2021学年度人教版（2019）选择性必修第一册2.2简谐运动的描述同步训练1（含解析）1．在弹簧振子振动过程中，下列物理量方向始终相同的是（ ）A ．速度和加速度B ．加速度和位移C ．回复力和加速度D ．回复力和速度 2．如图甲所示，小物体从竖直弹簧上方离地高1h 处由静止释放，其动能kE 与离地高度h 的关系如图乙所示，其中高度从1h 下降到2h ，图像为直线，其余部分为曲线，3h 对应图像的最高点，轻弹簧劲度系数为k ，小物体质量为m ，重力加速度为g ，以下说法正确的是（ ）A ．小物体下降至高度3h 时，弹簧形变量为0B ．小物体下落至高度5h 时，加速度为0C ．小物体从高度2h 下降到4h ，弹簧的弹性势能增加了222m g kD ．小物体从高度1h 下降到5h ，物体的最大动能为()13mg h h -3．如图所示，在竖直平面内摇摇椅绕虚线位置发生振动，假设摇摇椅的运动是个简谐运动，图中是摇摇椅振动到的最左侧，振动周期为0.6s 。
在周期为0.2s 的频闪光源照射下，从图示位置开始计时，图像可能是（ ）A ．B ．C ．D4．物体做简谐运动，振幅为0.4cm ，周期为0.5s ，计时开始时具有正向最大加速度，它的位移公式是（ ）A ．3410sin 4m 2x t ππ-⎛⎫=⨯+ ⎪⎝⎭ B ．3410sin 4m 2x t ππ-⎛⎫=⨯- ⎪⎝⎭C ．3410sin 2m 2x t ππ-⎛⎫=⨯+ ⎪⎝⎭D ．3410sin 2m 2x t ππ-⎛⎫=⨯- ⎪⎝⎭ 5．如图所示，一个弹簧振子沿x 轴做简谐运动，其平衡位置在x 轴坐标原点O 处。
从某时刻开始计时，经过四分之一的周期，振子具有沿x 轴正方向的最大速度，图中能正确反映该弹簧振子的位移x 与时间t 关系的图像是（ ）A ．B ．C ．D ．6．关于水平放置的弹簧振子所做的简谐运动，下列说法正确的是（ ）A ．位移的方向是由振子所在处指向平衡位置B ．加速度的方向总是由振子所在处指向平衡位置C ．经过半个周期振子经过的路程一定是振幅的2倍D ．若两时刻相差半个周期，弹簧在这两个时刻的形变量一定相等7．如图（a ），轻质弹簧下端固定在水平地面上，上端连接一轻质薄板。
2020--2021学年高二上学期物理人教版(2019)选择性必修第一册第2章 机械振动含答案
2020—2021学年（新教材）人教物理选择性第一册第2章机械振动含答案人教（新教材）选择性必修第一册第2章：机械振动1、一质点做简谐运动，其振动图像如图所示，在0.3～0.4 s时间内质点的运动情况是()A．沿x轴负方向运动，位移不断增大B．沿x轴正方向运动，速度不断减小C．动能不断增大，势能不断减小D．动能不断减小，加速度不断减小2、（双选）如图所示为某物体做简谐运动的图像，下列说法中正确的是()A．由P→Q位移在增大B．由P→Q速度在增大C．由M→N位移是先减小后增大D．由M→N位移始终减小3、（双选）把一弹簧振子的弹簧拉长一些，然后由静止释放，0.5 s后振子经过平衡位置，则此弹簧振子的周期可能是()A．1 s B．2 s C．0.55 s D．0.4 s4、做简谐运动的弹簧振子，其质量为m，最大速率为v0，若从某时刻算起，在半个周期内，合外力()A．做功一定为0B．做功一定不为0C．做功一定是12m v2D．做功可能是0到12m v2之间的某一个值5、如图所示，MN为半径较大的光滑圆弧轨道的一部分，把小球A放在MN 的圆心处，再把另一小球B放在MN上离最低点C很近的M处，今使两球同时自由释放，则在不计空气阻力时有()A．A球先到达C点B．B球先到达C点C．两球同时到达C点D．无法确定哪一个球先到达C点6、在洗衣机把衣服脱水完毕后，电动机还要转动一会才能停下来，此时发现洗衣机先振动得比较小，然后有一阵子振动得很剧烈，然后振动慢慢减小直至停下来，其间振动剧烈的原因是()A．洗衣机没放平衡B．电动机有一阵子转快了C．电动机转动的频率和洗衣机的固有频率相近或相等D．这只是一种偶然现象7、如图所示是某振子做简谐运动的图像，以下说法中正确的是()A．因为振动图像可由实验直接得到，所以图像就是振子实际运动的轨迹B．振动图像反映的是振子位移随时间变化的规律，并不是振子运动的实际轨迹C．振子在B位置的位移就是曲线BC的长度D．振子运动到B点时的速度方向即为该点的切线方向8、（双选）某弹簧振子沿x轴的简谐运动图像如图所示，下列描述正确的是()A．t＝0 s时，振子的速度为零，位移为零B．t＝1 s时，振子的速度为正向最大C．t＝2 s时，振子的速度为负的最大值D．t＝3 s时，振子的位移为负向最大9、如图所示，弹簧振子在BC间振动，O为平衡位置，BO＝OC＝5 cm，若振子从B到C的运动时间为1 s，则下列说法正确的是()A．振子从B经O到C完成一次全振动B．振动周期是1 s，振幅是10 cmC．经过两次全振动，振子通过的路程是20 cmD．从B开始经过3 s，振子通过的路程是30 cm10、如图所示为某个弹簧振子做简谐运动的振动图像，由图像可知()A．在0.1 s时，由于位移为零，所以振动能量为零B．在0.2 s时，振子具有最大势能C．在0.35 s时，振子具有的能量尚未达到最大值D．在0.4 s时，振子的动能最大11、（双选）如图所示为一单摆的振动图像，则()A．t1和t3时刻摆线的拉力等大B．t1和t3时刻摆球速度相等C．t3时刻摆球速度正在减小D．t4时刻摆线的拉力正在减小12、在飞机的发展史中有一个阶段，飞机上天后不久，飞机的机翼(翅膀)很快就抖动起来，而且越抖越厉害，后来经过人们的探索，利用在飞机机翼前装一个配重杆的方法，解决了这一问题，在飞机机翼前装配重杆的目的主要是() A．加大飞机的惯性B．使机体更加平衡13、甲同学想在家里做用单摆测定重力加速度的实验，但没有合适的摆球，他找到了一块长为3 cm左右，外形不规则的大理石块代替小球．他设计的实验步骤是：A．将石块用细线系好，结点为M，将细线的上端固定于O点(如图所示) B．用刻度尺测量OM间细线的长度l作为摆长C．将石块拉开一个大约α＝30°的角度，然后由静止释放D．从石块摆到最高点时开始计时，测出30次全振动的总时间t，由T＝t30得出周期(1)则该同学以上实验步骤中有错误的是________．(2)若该同学用OM的长作为摆长，这样做引起的系统误差将使重力加速度的测量值比真实值______(选填“偏大”或“偏小”)．(3)如果该同学改正了错误，改变OM间细线的长度做了2次实验，记下每次相应的细线长度l1、l2和周期T1、T2，则由上述四个量得到重力加速度g的表达式是________．14、一物体沿x轴做简谐运动，振幅为8 cm，频率为0.5 Hz，在t＝0时，位移是4 cm，且向x轴负方向运动．(1)试写出用正弦函数表示的振动方程．(2)求10 s内通过的路程是多少．15、有一单摆，其摆长l＝1.02 m，摆球的质量m＝0.10 kg，已知单摆做简谐运动，单摆完成30次全振动所用的时间t＝60.8 s，试问：(1)当地的重力加速度是多大？(2)如果将这个摆改为秒摆，摆长应怎样改变？改变多少？2020—2021学年（新教材）人教物理选择性第一册第2章机械振动含答案人教（新教材）选择性必修第一册第2章：机械振动1、一质点做简谐运动，其振动图像如图所示，在0.3～0.4 s时间内质点的运动情况是()A．沿x轴负方向运动，位移不断增大B．沿x轴正方向运动，速度不断减小C．动能不断增大，势能不断减小D．动能不断减小，加速度不断减小【答案】B2、（双选）如图所示为某物体做简谐运动的图像，下列说法中正确的是()A．由P→Q位移在增大B．由P→Q速度在增大C．由M→N位移是先减小后增大D．由M→N位移始终减小【答案】AC3、（双选）把一弹簧振子的弹簧拉长一些，然后由静止释放，0.5 s后振子经过平衡位置，则此弹簧振子的周期可能是()A．1 s B．2 s C．0.55 s D．0.4 s【答案】BD4、做简谐运动的弹簧振子，其质量为m，最大速率为v0，若从某时刻算起，在半个周期内，合外力()A．做功一定为0B．做功一定不为0C．做功一定是12m v2D．做功可能是0到12m v2之间的某一个值【答案】A5、如图所示，MN为半径较大的光滑圆弧轨道的一部分，把小球A放在MN 的圆心处，再把另一小球B放在MN上离最低点C很近的M处，今使两球同时自由释放，则在不计空气阻力时有()A．A球先到达C点B．B球先到达C点C．两球同时到达C点D．无法确定哪一个球先到达C点【答案】A6、在洗衣机把衣服脱水完毕后，电动机还要转动一会才能停下来，此时发现洗衣机先振动得比较小，然后有一阵子振动得很剧烈，然后振动慢慢减小直至停下来，其间振动剧烈的原因是()A．洗衣机没放平衡B．电动机有一阵子转快了C．电动机转动的频率和洗衣机的固有频率相近或相等D．这只是一种偶然现象【答案】C7、如图所示是某振子做简谐运动的图像，以下说法中正确的是()A．因为振动图像可由实验直接得到，所以图像就是振子实际运动的轨迹B．振动图像反映的是振子位移随时间变化的规律，并不是振子运动的实际轨迹C．振子在B位置的位移就是曲线BC的长度D．振子运动到B点时的速度方向即为该点的切线方向【答案】B（双选）某弹簧振子沿x轴的简谐运动图像如图所示，下列描述正确的是() 8、A．t＝0 s时，振子的速度为零，位移为零B．t＝1 s时，振子的速度为正向最大C．t＝2 s时，振子的速度为负的最大值D．t＝3 s时，振子的位移为负向最大【答案】CD9、如图所示，弹簧振子在BC间振动，O为平衡位置，BO＝OC＝5 cm，若振子从B到C的运动时间为1 s，则下列说法正确的是()A．振子从B经O到C完成一次全振动B．振动周期是1 s，振幅是10 cmC．经过两次全振动，振子通过的路程是20 cmD．从B开始经过3 s，振子通过的路程是30 cm【答案】D10、如图所示为某个弹簧振子做简谐运动的振动图像，由图像可知()A．在0.1 s时，由于位移为零，所以振动能量为零B．在0.2 s时，振子具有最大势能C．在0.35 s时，振子具有的能量尚未达到最大值D．在0.4 s时，振子的动能最大【答案】B11、（双选）如图所示为一单摆的振动图像，则()A．t1和t3时刻摆线的拉力等大B．t1和t3时刻摆球速度相等C．t3时刻摆球速度正在减小D．t4时刻摆线的拉力正在减小【答案】AD12、在飞机的发展史中有一个阶段，飞机上天后不久，飞机的机翼(翅膀)很快就抖动起来，而且越抖越厉害，后来经过人们的探索，利用在飞机机翼前装一个配重杆的方法，解决了这一问题，在飞机机翼前装配重杆的目的主要是() A．加大飞机的惯性B．使机体更加平衡【答案】D13、甲同学想在家里做用单摆测定重力加速度的实验，但没有合适的摆球，他找到了一块长为3 cm左右，外形不规则的大理石块代替小球．他设计的实验步骤是：A．将石块用细线系好，结点为M，将细线的上端固定于O点(如图所示) B．用刻度尺测量OM间细线的长度l作为摆长C．将石块拉开一个大约α＝30°的角度，然后由静止释放D．从石块摆到最高点时开始计时，测出30次全振动的总时间t，由T＝t30得出周期(1)则该同学以上实验步骤中有错误的是________．(2)若该同学用OM的长作为摆长，这样做引起的系统误差将使重力加速度的测量值比真实值______(选填“偏大”或“偏小”)．(3)如果该同学改正了错误，改变OM间细线的长度做了2次实验，记下每次相应的细线长度l1、l2和周期T1、T2，则由上述四个量得到重力加速度g的表达式是________．答案：(1)BCD(2)偏小(3)g＝21T22－T2114、一物体沿x轴做简谐运动，振幅为8 cm，频率为0.5 Hz，在t＝0时，位移是4 cm，且向x轴负方向运动．(1)试写出用正弦函数表示的振动方程．(2)求10 s内通过的路程是多少．解析：(1)简谐运动振动方程的一般表达式为x＝Asin(ωt＋φ)．根据题目条件，【答案】(1)x＝0.08sinπt＋56πm(2)1.6 m15、有一单摆，其摆长l＝1.02 m，摆球的质量m＝0.10 kg，已知单摆做简谐运动，单摆完成30次全振动所用的时间t＝60.8 s，试问：(1)当地的重力加速度是多大？(2)如果将这个摆改为秒摆，摆长应怎样改变？改变多少？【答案】(1)9.79 m/s2(2)其摆长要缩短缩短0.027 m。
人教版高中英语必修第一册同步训练UNIT2 Section Ⅰ含答案
UNIT 2TRAVELLING AROUNDSectionⅠListening and Speaking课后·训练提升一、根据句意及首字母提示写出单词1.We should a what we’ve learned to practice.答案:apply2.I’m really a to hear that he was late for such an important meeting.答案:amazed3.The assistant has a a hotel for you.答案:arranged4.Nowadays,a mobile phone is e useful in our daily life.答案:extremely5.The father decided to p a few things and took the sick baby to hospital.答案:pack6.The lady r her spare rooms to some university students last year. 答案:rented二、完成句子1.这些游客正在申请签证。
These visitors visas.答案:are applying for2.别制造噪声,请集中精力工作。
Don’t make a noise;please your work.答案:focus on3.令我们惊讶的是,他竟然没通过驾驶考试。
,he should fail the driving test.答案:To our amazement4.我期望再次见到你。
I you again.答案:look forward to meeting5.别担心,我已经把每样东西都打包好了。
Don’t worry.I have .答案:packed everything up6.建议你要提前做好旅行安排。
You are advised to .答案:make travel arrangements in advance7.去中国九寨沟的最佳时间是什么时候?What is Jiuzhaigou,China?答案:the best time to visit8.她到达后打算怎么出行?How is she planning to after she arrives?答案:get around三、同义句转换1.He is going to Beijing by plane.→He is going to Beijing .答案:by air2.The girl focused on the homework she was doing.→The girl the homework she was doing.答案:concentrated on3.It was amazing for us to know that Kate refused our help.→We know that Kate refused our help.答案:were amazed4.The tourists hired a car to travel around the city.→The tourists a car to travel around the city.答案:rented四、阅读理解Travelling can be a fun way to gain life experiences,but what if you’re a student and don’t have enough money for a trip?Don’t worry.Here are some useful tips.Save:This probably is the most important preparation for travelling.Cut expenses(花费)to fatten your wallet so you’ll have more choices abo ut where to go and how to get there.Plan ahead:Don’t wait until the last minute to plan your trip.Giving yourself several months to get ready can mean security and savings.Do your homework:No matter where you go,research the places you will visit.Decide what to see.Travel books will provide information on the cheapest hotels and restaurants.Plan sensibly:Write down how much you expect to spend on food and hotels.Stick to(坚持)your plan,or you may not have enough money to cover everything.Travel in groups:Find someone who is interested in visiting the same places.By travelling with others you can share costs and experiences.Work as you go:Need more money to support your trip?Look for work in the places you visit.Go off the beaten path:Tourist cities may be expensive.You may want to rethink about your trip and go to a less known area.Smaller towns can have many interesting activities(活动) and sights.Pack necessary things:The most important things to take are not always clothes.Remember to take along medicine in case you get sick and snacks in case you cannot find a cheap restaurant.By planning sensibly,even students can enjoy their travel.Your travel experiences will be remembered for a lifetime.1.Before your trip,the first thing you should do is.A.to make a plan of the routeB.to get information on the InternetC.to save money by spending lessD.to buy tickets ahead of time答案:C解析:细节理解题。
高二英语人教版第一册同步(5) Unit 2 Learning about Lan
2020-2021学年高二英语人教版(2019)选择性必修第一册同步课时作业(5) Unit 2 Learning about Language一、填空1.These are examples of natural _________(克隆).2.Nobody could _________(预测) the final result.3.I'm sure that _________(人工的) intelligence will have a promising future.4.Our government has taken effective measures to fight against violent _________(犯罪活动).5.Advances in technology c_________(结合)with more open policies have already created an interconnected world.6.Many companies make ____________ a rule to send birthday e-cards to their customers.7.Explorers who work on scientific research ____________(stand) at the Arctic Pole this time tomorrow.8.We are confident that the environment ____________(improve) by our further efforts to reduce pollution.9.China will safeguard energy security by resource protection, ____________(advocate) green lifestyles and consumer culture.10.The watch is so beautiful and it happens to be 50 percent off, so I can't resist ____________ (buy) it.11.____________(oppose) to developing the nature reserve, the local people prevented the construction workers from entering their villages.12.WeChat is a great way to keep ____________ touch with other people and quickly broadcast information about where you are and what you are doing.13.It's high time that we placed great emphasis ____________the improvement of food safety.14.Some people always take seriously the ____________(predict) of the end of the world in the near future.15.In the ____________(absent) of clear goals, we are stuck in daily routine until we become slaves of it.二.阅读理解Nearly every week, we hear news about the latest successes and failures in driverless vehicles. But we hear little about how other industries are developing this same kind of technology.One industry heavily involved in researching and developing artificial intelligence, or AI, is agriculture. Companies are experimenting with high-tech tools that can help farmers save time and money, while reducing environment-harming chemicals.One of the companies is ecoRobotix of Switzerland. It created a robot equipped with AI and cameras to identify all plants on a farm. The robot has four wheels to carry it through the fields in search of weeds. Computer-controlled arms then lower and spray the weeds with small amounts of herbicide (除草剂). Company officials say the robot can fully operate on its own for up to 12 hours a day while being powered by the sun. It uses the same kind of sensor and positioning technology used to guide driverless vehicles. A farmer can also control the equipment through a smartphone.The co-founder of ecoRobotix, Aurelien Demaurex, says the farm robot can kill weeds with 20 times less herbicide than traditional methods. This is because the system uses exactly the right amount of chemical in the exact place required to kill the weeds. Currently, farmers spread weed killers over massive areas to destroy unwanted plants.Another company developing farm robotics is California-based Blue River Technology. The company has a system called "See & Spray", which it claims is the world's first smart sprayer. The system—which connects to the back of a tractor—is also equipped with AI to identify and chemically kill only the weeds. It can also spray chemicals on wanted plants to help them grow. Ben Chostner, vice-president of business development for Blue River Technology, explains in a company video that "See & Spray" technology uses the same deep learning methods used in facial recognition. "The first time the machine saw a pigweed, it didn't know what kind of plant it was. But we taught it—by giving it tens of thousands of examples of pigweed—and now it's an expert in pigweed."1.How will AI benefit agriculture?A.It will fund agriculture research.B.It contributes to low-cost farming.C.It can avoid harmful chemicals.D.It frees all farmers from field work.2.What do the products of the two companies have in common?A.They use recognition technology.B.They are powered by solar energy.C.They are connected with smart phones.D.They can help wanted plants grow rapidly.3.What do Ben Chostner's words suggest about the robot?A.It is environmentally friendly.B.It is good at self-improving.C.It has the learning ability.D.It can track various plants.4.What is mainly talked about in the text?A.The experiment in farming robots.B.New trend in artificial intelligence.C.Modern "See & Spray" technology.D.Artificial intelligence in agriculture.三.阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。