内蒙古杭锦后旗奋斗中学2019届高三上学期第二次调研考试物理试题

适用年级:高三
试卷号:114948

试卷类型:高考模拟
试卷考试时间:2018/10/3

1.单选题(共6题)

1.
如图所示,假设在某次比赛中运动员从10m高处的跳台跳下,设水的平均阻力约为其体重的5倍,在粗略估算中,把运动员当做质点处理,为了保证运动员的人身安全,池水深度至少为(不计空气阻力)()
A.5 mB.2.5 mC.3 mD.1.5 m
2.
质量为m的小球,以速度v斜向上抛离高为H的桌面。如图,那么经过A点时所具有的机械能是(以桌面为零势面)
A.B.
C.D.
3.
水平传送带以速度v匀速传动,一质量为m的小物块A由静止轻放在传送带上,如图在小木块与传送带相对静止时,系统转化为内能的能量为(   )
  
A.mv2B.2mv2C.mv2D.mv2
4.
物体沿直线运动的v-t关系如图所示,已知在第1秒内合外力对物体做的功为W,则()

A. 从第1秒末到第3秒末合外力做功为4W
B. 从第3秒末到第5秒末合外力做功为-2W
C. 从第5秒末到第7秒末合外力做功为W
D. 从第3秒末到第4秒末合外力做功为-0.75W
5.
如图所示,光滑斜面的顶端固定一弹簧,一小球向右滑行,并冲上固定的地面上的斜面。设小球在斜面最低点的速度为,压缩弹簧至点时弹簧最短,点距地面高度为,则小球从的过程中弹簧弹力做功是(  )
A.B.C.D.
6.
在同一位置以相同的速率把三个小球分别沿水平、斜向上、斜向下方向抛出,不计空气阻力,则落在同一水平地面时的速度大小
A.一样大B.水平抛的最大
C.斜向上抛的最大D.斜向下抛的最大

2.选择题(共2题)

7.下列划线字注音有误的一项是(
8.

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。

 A. Make sure you match the job description

 B. Be conscious of good interview manners

 C. Put your interviewer at ease

 D. Plan before you pursue

 E. Dress to make a good first impression

 F. Do be sincere

    Attending an interview with the intent to impress the hiring manager is dangerous if you go about it in the wrong way. Below are some things you can do to maximize your chances of getting the job.

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    True, sometimes interviewers aren't prepared themselves, but that doesn't mean they'll forgive you for the same mistake. Developing and following a plan at the beginning of a job search has a significant impact on its success. Research the job thoroughly. Think about how your previous experience qualifies you and how it compares to the work on offer. Set "process goals" to keep you on track toward your larger career goals. "Process goals" aren't big-picture objectives. They're "roll up your sleeves and make it happen" objectives.

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    You can't think of any personal weaknesses, you’ve overcome all your weaknesses, or you say you haven't given it a lot of thought. Mistakes? Not you. No one progresses in a career without making mistakes and learning from them. Trained interviewers will be looking to see if you readily acknowledge and admit your weaknesses and can describe mistakes you’ve made and what you learned from them. Never give a measured response that sugarcoats reality to a tough interview question about your past.

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    If you were a 6-foot, 5-inch, 250-pound Frenchman with strong arms and a bushy beard, would you apply for the part of Little Orphan Annie on Broadway? How ridiculous that image is. If you don't have an accurate understanding of what the job is all about, your opinion of how well-matched you are will be based on an inaccurate foundation. For example, sales professionals are expected to possess excellent communication skills, time management and organization skills. Make sure you have a full job description from the employer so you can match your skills to the job's requirements.

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    The best way to ensure a good first impression is to dress smart. What is appropriate depends on the particular employer and job but, generally speaking, it is better to dress formally while remaining comfortable. If you are unsure what to wear, you should always go with the most conservative, professional option. What you are wearing tells employers a lot about how serious you are about getting the job. The more confident and polished you appear, the more likely you are to leave the interviewer with a positive impression of you.

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    Learn as much as you can about how the interview will be conducted. Employers are looking for the candidate with the best knowledge and experience, but rarely do they hire for work skills at the expense of social skills. If you lack self-awareness, it shows. And it doesn't look good. Be on time for your interview. Be aware of your body language. Even in the critical small talk before the interview, make eye contact with your interviewer to convey confidence when you're speaking, smile when it's appropriate, and look alert.

3.多选题(共4题)

9.
如图所示,三个相同的小球从同一高度处的O点分别以水平初速度v1、v2、v3抛出,落在水平面上的位置分别是A、B、C,O′是O在水平面上的射影点,若不计空气阻力,则下列说法正确的是(  )

A. 三小球动能改变量相同
B. 三个小球落地时的速度大小相同,但方向不同
C. 落地时C小球速度与水平方向夹角最小
D. 三个小球落地的动能相同
10.
如图所示,一轻弹簧固定于O点,另一端系一重物,将重物从与悬点O在同一水平面且弹簧保持原长的A点无初速度地释放,让它自由摆下,不计空气阻力,在重物由A点摆向最低点的过程中(  )
A.重物的机械能减少
B.重物与弹簧组成的系统的机械能不变
C.重物与弹簧组成的系统的机械能增加
D.重物与弹簧组成的系统的机械能减少
11.
某人用手将1 kg的物体由静止向上提起1 m,这时物体的速度为2 m/s(g取10 m/s2),则下列说法正确的是(  )
A.手对物体做功12 JB.合力做功2 J
C.合力做功12 JD.物体克服重力做功10 J
12.
在奥运比赛项目中,高台跳水是我国运动员的强项。质量为的跳水运动员进入水中后受到水的阻力而做减速运动,设水对他的阻力大小恒为,那么在他减速下降高度为的过程中,为当地的重力加速度。下列说法正确的是( )
A. 他的动能减少了 B. 他的重力势能减少了
C. 他的机械能减少了 D. 他的机械能减少了

4.解答题(共3题)

13.
(10分)如图所示,光滑水平面AB与竖直面内的半圆形导轨在B点相接,导轨半径为R.一个质量为m的物体将弹簧压缩至A点后由静止释放,在弹力作用下物体获得某一向右速度后脱离弹簧,脱离弹簧后当它经过B点进入导轨瞬间对导轨的压力为其重力的7倍,之后向上运动完成半个圆周运动恰好到达C点。试求:

(1)弹簧开始时的弹性势能;
(2)物体从B点运动至C点克服阻力做的功;
(3)物体离开C点后落回水平面时的速度大小和方向。
14.
在竖直平面内,有一光滑的弧形轨道AB,水平轨道BC=4m。质量m=1kg的物体从弧形轨道A点无初速滑下,经过B点,最后停在C点,A点距水平轨道高h=0.80m。(g=10m/s2)求:

(1)物体滑至B点的速度大小;
(2)BC段的滑动摩擦因数μ
15.
质量均为m的物体A和B分别系在一根不计质量的细绳两端,绳子跨过固定在倾角为30°的斜面顶端的定滑轮上,斜面固定在水平地面上,开始时把物体B拉到斜面底端,这时物体A离地面的高度为0.8米,如图所示.若摩擦力均不计,从静止开始放手让它们运动.(斜面足够长,g取10m/s2)求:

(1)物体A着地时的速度;
(2)物体A着地后物体B沿斜面上滑的最大距离.

5.实验题(共1题)

16.
在“验证机械能守恒定律”的实验中,打点计时器所用电源频率为50 Hz,当地重力加速度的值为9.80 m/s2,测得所用重物的质量为1.00 kg.若按实验要求正确地选出纸带进行测量,量得连续三点A、B、C到第一个点的距离如图所示(相邻计数点时间间隔为0.02 s)。按要求将下列问题补充完整。

(1)纸带的________(左、右)端与重物相连;
(2)打点计时器打下计数点B时,物体的速度vB=________________m/s;
(3)从起点O到打下计数点B的过程中重力势能减少量是△Ep =______________J,此过程中物体动能的增加量△Ek =_____________J;(计算结果保留两位有效数字)
(4)实验的结论是_____________________.
试卷分析
  • 【1】题量占比

    单选题:(6道)

    选择题:(2道)

    多选题:(4道)

    解答题:(3道)

    实验题:(1道)

  • 【2】:难度分析

    1星难题:0

    2星难题:0

    3星难题:0

    4星难题:1

    5星难题:0

    6星难题:6

    7星难题:0

    8星难题:5

    9星难题:2