您所在的当前位置：初中物理试题 >

能量

> 甲、乙、丙三人各乘坐一架直升飞机，他们从自己所在的飞机往外看，甲看见丙的飞机匀速上升，乙看见甲的飞机匀速下降，丙看见地面上的楼房和乙的飞机都以相同速度匀速上升，则下列判断不正确的是 A.丙相对于地面匀速下降 B.甲相对于地面匀速下降 C.甲相对于丙在匀速下降 D.乙相对于地面匀速上升

问题：

发布时间：2024-09-09

甲、乙、丙三人各乘坐一架直升飞机，他们从自己所在的飞机往外看，甲看见丙的飞机匀速上升，乙看见甲的飞机匀速下降，丙看见地面上的楼房和乙的飞机都以相同速度匀速上升，则下列判断不正确的是

A.丙相对于地面匀速下降
B.甲相对于地面匀速下降
C.甲相对于丙在匀速下降
D.乙相对于地面匀速上升

参考答案：

提问用户：sb***vHM

可能感兴趣的题目：

1 已知定义在R上的函数f（x）满足 f(x+ π 2 )=f(x- π 2 )；且当 x∈(- π 2 ， π 2 ）时，f（x）=sinx，则不等式f（x）≤ f(- π 6 )的解集为______．
2 下列各组离子在指定的环境中能大量存在的是（　　） A．pH=1的无色溶液中：SO42-、Cu2+、Na+、Cl- B．能使石蕊试纸变蓝色的溶液中：Na+、K+、S2-、CO32- C．加入铝粉能产生H2的溶液中：NH4+、Na+、Fe2+、NO3- D．水电离出的c（H+）=1×10-12mol/L的溶液中：K+、Na+、Cl-、HCO3-
3 完形填空。 Having lived in the house for so long, we found our kitchen looked old. We decided it was time to 1 the kitchen, and my husband and I were discussing 2 colors. The children, sitting nearby, suddenly all spoke together: "Not the measuring stick." "No," I 3 them. "Not the measuring stick." The measuring stick isn"t a (an) 4 stick but the kitchen side of the door between our kitchen and dining room. Along the edge we"ve 5 each child"s growth by making a mark showing his or her 6 on every birthday. Over the years so many colored pens, pencils and markers have been used, that now, this white door is somewhat like an abstract painting. Names and dates show different 7 , and I can tell by the script(手迹) who measured whom. An eight-year-old measured her three-year-old sister, a grandchild measured her grandmother, my husband measured me. At the parties, when this door 8 back and forth frequently, friends stop to 9 the names and dates. When we ask if they would like to be always remembered, they usually smile 10 and go back right up into place, 11 to be measured. Many of those listed on the door are still 12 ; some have stopped. Some remain with us only in 13 . When my mother came to see my eldest daughter graduate from university, we measured her too. It was her last visit to our home. We haven"t 14 the new kitchen color plan yet, but one thing is certain: whatever color we choose, the back of the kitchen door will always remain 15 , with lots of names and dates in various colors. ( ) 1. A. restore ( ) 2. A. comfortable ( ) 3. A. promised ( ) 4. A. false ( ) 5. A. kept ( ) 6. A. age ( ) 7. A. information ( ) 8. A. adjusts ( ) 9. A. copy ( )10. A. proudly ( )11. A. ready ( )12. A. growing ( )13. A. sight ( )14. A. concerned about ( )15. A. fresh B. rebuild B. possible B. repeated B. wonderful B. witnessed B. weight B. handwriting B. shuts B. read B. automatically B. voluntary B. contributing B. design B. approved of B. old C. sell C. available C. followed C. actual C. recorded C. name C. style C. opens C. appreciate C. shyly C. able C. studying C. amazement C. decided on C. white D. repaint D. changeable D. responded D. obvious D. accompanied D. height D. characteristic D. swings D. remove D. calmly D. unwilling D. working D. memory D. relied on D. original
4 运行如图所示的程序，输出的结果是（　　） A．1 B．2 C．3 D．4
5 标准状况下2.24LH 2和Cl 2组成的混合气体，经光照后缓缓通入100ml 1mol/LNaOH溶液中充分反应，测得最终溶液中NaClO的浓度为0.1mol/L（假设溶液体积不变，且不考虑水解），则原混合气体中Cl 2的体积分数为（） A．55% B．60% C．65% D．70%
6 （12分）2013年9月15日，西安地铁1号线正式通车, 西安地铁正式进入换乘时代。已知相距4000 m的甲乙两站之间的线路为直线，在调试运行时，列车出站加速和进站减速的加速度大小均为1 m/s 2，中途保持匀速运行。列车从甲站由静止出发到乙站停止正好用时4 min。某次调试时，列车从甲站出发比原定的出发时间晚了20s，但仍保持与原来相同的加速度出站和进站，要使列车仍然准点到达乙站，求此次列车出站加速的时间应为多少？
7 在消化道中，既有消化功能，或又有吸收功能的消化道是 ①口腔 ②咽 ③食道 ④胃 ⑤小肠 ⑥大肠 ⑦肛门 A.①②③④⑤⑥ B.①④⑤⑥ C.①③④⑤ D.③④⑤⑥⑦
8 对于丰水带的叙述，正确的是 A.是我国平原主要分布地区，耕地资源广阔，水土配合良好，特别利于农业发展 B.水资源丰富主要是因为距海洋近，降水丰富 C.水资源非常丰富，区域永远都不会缺水，所以不需要节约用水 D.我国已将丰水带多余的水资源大量调到了缺水带，解决了缺水带地区水资源不足的问题
9 商品谷物农业是一种面向市场的农业地域类型，种植的作物主要是小麦和玉米。据此回答2题。小题1:美国中部平原发展商品谷物农业优越的区位条件有（） ①地势平坦开阔，土壤深厚、肥沃 ②气候温和、降水丰富 ③人口众多，劳动力资源丰富 ④水陆运输发达，构成四通八达的交通运输网 A．①②③ B．①②④ C．②③④ D．①③④ 小题2:商品谷物农业的基本特征是（） A．生产规模大，机械化程度高 B．商品谷物农业分布在发展中国家 C．主要靠雇员经营 D．需要劳动力多
10 静止在湖面上的小船上分别向相反方向水平抛出两个质量相等的小球，甲球先抛出，向左；乙球后抛出，向右，两球抛出后相对于岸的速率相等，则下面说法正确的是（　　　） A．两球抛出后，船向右以运动，且在抛出过程中乙球受到的冲量大些。 B．两球抛出后，船向右以运动，且在抛出过程中甲球受到的冲量大些。 C．两球抛出后，船的速度为零，且在抛出过程中甲球受到的冲量大些。 D．两球抛出后，船的速度为零，且在抛出过程中两球受到的冲量大小相等。