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编号:20250521150105248
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（24-25高二上·广东·期中）如图所示，半径的光滑绝缘竖直圆轨道与长度的水平轨道相切于点，点位于圆心的正下方且有一小孔。将一个质量的小木块（可视为质点）放在A点，小木块和水平轨道间的动摩擦因数，不计空气阻力，重力加速度。若给小木块一初速度，小木块刚好可以在圆轨道内完成圆周运动。

(1)求初速度的大小；

(2)若在小木块上固定一个电荷量为的带电体（可视为质点），带电体和小木块的总质量，同时在整个空间施加一电场强度大小，方向水平向右的匀强电场（如图乙所示），且在A点仍给小木块初速度。

①求小木块通过最高点时对圆轨道的压力的大小；

②请通过计算判断小木块能否在圆轨道上做完整的圆周运动。

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2025年05月21日 0 views

编号:20250521150048739
学科题库

（24-25高二上·重庆沙坪坝·期中）如图所示，倾角为30°的光滑绝缘斜面固定在水平面上，斜面足够长。整个斜面处于一水平方向的匀强电场中，现将一带电量为+q，质量为m的小球轻放在斜面上，小球刚好能静止在斜面上。已知重力加速度g。

(1)求电场强度的大小及方向；

(2)现保持电场强度大小不变而将方向反向，将小球从斜面上某处斜向右上抛出，已知小球与斜面碰撞前后，平行于斜面方向的速度不变，垂直于斜面方向的速度等大反向。与斜面碰撞时，小球无电荷量损失，不计空气阻力。

（a）若小球抛出时初动能为E_k，与斜面发生第一次碰撞时动能为，第一次碰撞后小球做匀变速直线运动至最高点。求小球从抛出到运动至最高点的过程中，克服电场力做功W。

（b）若小球抛出时初速度为v，要求小球最后能沿原路回到抛出点，求初速度方向与斜面夹角α（α < 60°）的正切值tanα的所有可能值。

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2025年05月21日 0 views

编号:20250521150029769
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（24-25高二上·辽宁鞍山·期中）如图，平面直角坐标系（轴水平）的第二象限存在竖直向上的匀强电场。第一象限中，两个区域、内存在着大小相等，方向垂直于纸面向外的匀强磁场。电场强度和磁感应强度大小均未知。一粒子从点出发，在点垂直于轴进入区域，离开区域时速度方向与轴正方向夹角为37°，又已知粒子在、两点的速度大小满足关系，、两点水平方向的距离为。不计粒子重力。取。求：

(1)、两点间竖直方向的距离。

(2)求粒子从处至再次到达轴的时间。

(3)在点间放置一竖直弹性薄挡板，粒子击中挡板时没有能量损失。同时将区域内的磁感应强度大小变为（大小未知），方向不变。若粒子的轨迹能到达点，求粒子在区域、中轨道半径的比值。

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2025年05月21日 0 views

编号:20250521145934185
学科题库

（24-25高二上·云南昆明·期中）如图所示，平面在竖直面内，x轴水平，y轴竖直。第一象限内存在着平行y轴的匀强电场，区域没有电场。一个带正电、质量的小球（可视为质点）自A点以的初速度沿x轴正向抛出，从B点无碰撞地进入BCD光滑圆管道，圆管道的内径略大于小球的直径，最终从D点飞出，并沿直线回到A点。已知过B点的圆周切线与x轴正向成角，，小球重力不能忽略，不计空气阻力，。求：

(1)匀强电场的大小和方向；

(2)BCD圆管道的半径R；

(3)小球从D点飞出，要沿直线回到A点，并且到A的速度恰好为零，则在第二象限内要加上一个匀强电场。则电场的大小和方向（方向可用夹角的正切值表示）。

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2025年05月21日 0 views

编号:202505211459210
学科题库

（20-21高一下·福建三明·期末）阅读下面短文，根据其内容写一篇60词左右的内容概要。

A trip to a water park can be a fun adventure for families, couples or a group of friends. Whether you prefer relaxing in a tube on a lazy river or riding a water roller coaster, a trip to one of the nation's water parks offers something exciting to everyone. However, the fun does not come without risks. People who plan to go to a water park should be careful enough and follow rules to avoid these risks.

Drowning (溺水) is one of the greatest dangers in water parks, especially for young children. The ability to swim is the most important skill in a water park. Before you go to a water park, make sure that all the people in your group know how to swim well. Do not swim in water that does not have a lifeguard on the scene. Many parks provide life jackets for free - do prepare some in case some people need them.

People usually choose to go to water parks on clear sunny days, which means that they are easy to get sun burnt, or even get heatstroke. Most of the water parks are open areas with little shelter or few buildings to block the sun, so it can be dangerous for people who have fair and sensitive (敏感的) skin to spend a whole day there. Be sure to wear a hat and a shirt with sleeves over your bathing suit while you are walking around.

In rare cases, water park guests may be subjected to polluted water. Some illnesses are easily spread in such situation. The most common cause of water pollution is small children who are not old enough to go to the toilet. Water parks have been trying their best to avoid the spread of diseases. However, pollution is still possible. Guests can protect themselves by trying not to swallow any water and washing their hands after playing with shallow and still water.

___________

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2025年05月21日 0 views

编号:20250521145906553
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（2021·上海·模拟预测）Directions: Read the following passage. Summarize the main idea and the main point(s) of the passage in no more than 60 words. Use your own words as far as possible.

“There is a senseless concept that children grow up and leave home when they are 18, and the truth is far from that,” says sociologist Larry Bumpass of the University of Wisconsin. Today, unexpected numbers of young adults are living with their parents.

Analysts raised a variety of reasons for this return to the nest. One important reason is that the marriage age is rising, a condition that makes home and its pleasantness particularly attractive to young people, which is second to skyrocketing housing costs to which young people find their wings attached. Besides, a high divorce rate and a declining remarriage rate are sending economically pressed and emotionally hurt survivors back to parental shelters. For some, the expense of an away-from-home college education has become so great that many students now attend local schools.

Living at home, says Knighton, a school teacher, continues to give her security and moral support. Her mother agreed, “It is ridiculous for the kids to pay all that money for rent. It makes sense for kids to stay at home.” But sharing the family home requires adjustments for all. There are the quarrels over bathrooms, telephones and privacy. Some families, however, manage the delicate balancing act. But for others, it proves too difficult. Michelle Del Turco, 24, has been home three times — and left three times. “What I considered a social drink, my dad considered an alcohol problem,” she explains. “He never liked anyone I dated, so I either had to hide away to meet them at friends’ houses.”

It is really hard to say how long adult children should live with their parents before moving on. Nevertheless, it is commonly recognized that lengthy homecomings are a mistake and they accidentally destroy the advantage of brief visits that will strengthen the relationship between parents and children. Children, struggling to establish separate identities, can end up with “a sense of inadequacy, defeat and failure.” And aging parents, who should be enjoying some financial and personal freedom, find themselves stuck with responsibilities, which is definitely a stress for them.

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2025年05月21日 0 views

编号:20250521145854906
学科题库

（21-22高三上·安徽·阶段练习）每个班级中，都有一些为集体默默做出自己贡献的人。请你以“A devoted classmate”为题，写一篇短文向学校报社投稿，内容包括：

1. 他/她为班级做出的贡献；

2. 你对他/她的评价；

注意：1. 词数100左右。2. 题目已为你写好。3. 不要透露个人真实信息。

A devoted classmate

______________________________________________

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2025年05月21日 0 views

编号:20250521145841616
学科题库

（2022·山东·二模）美国ABC公司到曲阜参观。假如你是他们的导游James，你带领他们游览曲阜，并品尝曲阜美食。请根据行程安排表，写一篇导游词。

要点包括：1. 行程安排；2. 饮食住宿：3. 带团感受；4. 期盼明天；

Date City Name	May 10th, 2021	Weather	Sunny
	Qufu	Scenic Spots	Mansion, Temple and Cemetery of Confucius
Group Size	6 males and 4 females	Hotel	Haitian Hotel
Restaurant	Family Restaurant	Food	Qufu delicious food
Brief Plans	Visiting and admiring the Mansion, Temple and Cemetery of Confucius.
	Having some Qufu delicious food there for lunch.
	Drinking a cup of Rizhao Green Tea.
	Having supper on everyone’s own.
	Evening: Free time, free activities.

Now ladies and gentlemen, we will arrive at Haitian Hotel in 20 minutes. Now let me introduce tomorrow’s plan to you.

______________________________________________

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2025年05月21日 0 views

编号:20250521145830326
学科题库

（22-23高三上·海南·期末）阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。

It was last August. We were on vacation, just me, my husband, and our two kids, out for a nice, safe, socially distanced week away. We went to a popular place called Diana's Baths, where the water falls off a series of flat rocks up the mountain. The baths were full of families, so we made our way to one of the upper levels of rock to keep our distance.

Both where we sat and down below, the water fell down and into small pools, where kids in swimsuits were playing water around. I was frightened as I saw my two boys jump between the smooth rocks. I told them to stay away from all those edges. But I soon relaxed, and we were all having fun, laughing in the pools.

Suddenly, I turned and saw my son Wyatt sitting down between two rocks in fast-moving water. I shouted at him to get out. He called back something that I couldn't hear, and then he disappeared over the edge. All I remember from the moments after was screaming, over and over, like a prayer, “Somebody help my son!” I didn't even know what help he needed, because I couldn't force myself to look.

My husband was already jumping down the rocks. I finally looked. Wyatt was sitting up-he was alive. My biggest fear was gone. As I held my younger son, Jed, close, I heard another woman scream. “That child just went over the waterfall!” she shouted at her husband. “We are leaving!” They walked away, never even looking back to see whether our child was OK.

It was about 4 meters from the top of the waterfall to the pool below, which was filled with huge rocks. Wyatt had fallen on his back, straight onto the rocks. That's what Lisa told us. We didn't know her name was Lisa at that point. All we knew was that while everyone else looked on from a distance, too afraid or unbothered to help, Lisa didn't hesitate.

注意：1. 续写词数应为150左右；

2. 请按如下格式在答题卡的相应位置作答。

Later, Lisa told me that she was a nurse.

______________________________________________

The rescue team finally came.

______________________________________________

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2025年05月21日 0 views

编号:20250521145819179
学科题库

（21-22高三下·上海·期中）Directions: Read the following passage. Summarize the main idea and the main point(s) of the passage in no more than 60 words. Use your own words as far as possible.

Airline seats have been one-size-fits-all since the beginning. Today, those 16.5 to 18-inch wide seats are anything but.

According to the World Health Organization (WHO), obesity(肥胖症) has more than doubled since 1980. In 2014, more than l.9 billion adults were overweight, and over 600 million were obese.

The unchanged seat size and increase of obese passengers highlight the conflict between airlines’ needs and basic passenger rights.

Last month, lawyer Giorgio Destro, an Italian lawyer, sued Emirates, claiming his flight was disturbed by an obese passenger seated next to him. According to reports, Destro was not able to comfortably sit in his assigned seat, and spent much of the nine-hour flight standing or sitting in crew seats, because a 400-pound passenger took up half of his seat.

Many airlines have responded to the growing obesity by insisting passengers of size buy two seats to ensure safety and comfort. Samoa Air, for example, is charging by weight (which has become known as a “fat tax”). At first glance, the fat tax issue sounds discriminatory (歧视的), but some argue that this is purely down to numbers. A kilo is a kilo. It has nothing to do, with the condition of the weight. The heavier a plane is, the more fuel it burns through. In other words, the argument is whether it is fair that a 150-pound person is charged for their 50-pound bag, when a 300-pound person with a carry-on isn’t charged anything extra.

However, Peggy Howell of NAAFA argues that obesity is an illness, and that obese people should be entitled to having certain rights protected.

“We question the legality of the discriminatory policy and whether it violates the Air Carrier Access Act governing the treatment of passengers with disabilities,” she says. “The American Medical Association (AMA) recently declared obesity a disease, which should make fat passengers a protected class.”

Howell points out that the Canadian Transportation Agency (CTA) addressed this issue in 2009, and issued a ‘one-person, one-fare’ ruling covering passengers with disabilities. Those passengers include ones who are ‘clinically obese’ and who cannot fit into a single seat.

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2025年05月21日 0 views

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