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1、 哈尔滨工业大学（威海） 2011 / 2012 学年 秋 季学期 姓名: 班级： 学号： 姓名: 班级： 学号： 理论力学 试题卷（A）考试形式（开、闭卷）：闭卷 答题时间：120（分钟）本卷面成绩占课程成绩 80 % 题号一二三四五卷 面总 分平 时成 绩课 程总 成 绩分数 得分一、填空题（每题6分，共30分）1、图示滚轮的半径为R ，轮心速度为v ，加速度为a ，沿水平直线作纯滚动，M点加速度的大小为 。 遵 守 考 试 纪 律 注 意 行 为 规 范2、图示匀质细杆各以匀角速度绕轴转动。已知：杆长为，重为P。惯性力系向转轴简化，主矢的大小为 ，主矩的大小为 。3、如图所示，物块重P
2、=150N，靠在粗糙的水平天花板上，物体间静滑动摩擦因数fs=0.3， 动滑动摩擦因数f =0.2, 在物块上加一力F，且F =200N,=30，摩擦力大小为 。教研室主任签字： 第 1 页（共 5 页） 4、如图所示结构受集中力P作用，各杆自重不计。则杆1的内力为 。（须注明拉、压）遵 守 考 试 纪 律 注 意 行 为 规 范 5、如图所示，沿长方体的三个不相交且不平行的棱作用着3个大小相等的力F，若力系简化为一合力，求棱a,b,c的关系 。得分二、计算题（10分）如图所示简支梁，不计梁的重量，在C处作用一铅垂力P。试求支座B处的约束力（要求用虚位移原理求解，用其它方法做不给分）。 第 2
3、 页（共5页） 得分三、计算题（20分）如图所示，已知F,a ,M=Fa ，各杆不计自重。求：支座A、D处的约束力。遵 守 考 试 纪 律 注 意 行 为 规 范 第 3 页（共 5 页） 得分四、计算题（20分）如图所示机构中，曲柄A长r，以匀角速度0绕轴转动，带动连杆AC在套筒B内滑动，套筒及与其固连的杆BD可绕B铰转动，BD长，且垂直于AC。求在AB = 90,AB = 30 时，杆BD上D点的速度和加速度。遵 守 考 试 纪 律 注 意 行 为 规 范 第 4 页（共 5 页） 得分五、计算题（20分）如图所示，在倾角为的斜面上，有重为P的小车与绳索相连，绳索绕定滑轮A、动滑轮B后与固
4、定点C相连。设A 、B滑轮重均为Q ，半径为R的均质圆柱体，在动滑轮B下又挂一个重为W的重块，略去摩擦。求：（1）小车向下运动的条件及其加速度。（2）AB段绳索的张力。 遵 守 考 试 纪 律 注 意 行 为 规 范 2011 / 2012 学年 秋 季学期理论力学试题参考答案及评分标准一、填空题1、 (6分) 2、 (4分) (2分)3、N (6分) 4、 (5分) （拉）(1分) 5 、 (6分) 二、计算题解： （3分） （6分） （1分）三、计算题解：首先取BC杆，其受力图如图（c）所示，由 得 （2分）其次取弯杆AB，其受力图如图（b）所示，由 得 （2分） 图（2分）得 （2分）
5、得 （2分）对图（c），由 得 （2分） 得 （2分）最后取CD杆，其受力图如图（d）所示，由 得 （2分） 得 （2分） 得（2分）四、计算题解：1、AC杆作平面运动，则 （4分） 图（2分） 2、动点为A，动系为BD （1） （2分） （1分） ， （4分）式（1）两边向x轴投影 （2分） （1分）3、BD的角加速度与AC的角加速度相同 （1分） （2分）所以 （1分）五、计算题解：（1）系统的动能为 （5分）由于故 （2分）系统中外力所做的功为 （3分）由动能定理 （1分）两边对求导数，得 （1分）整理得 （1分） 因此，如开始处于静止，当Psin (Q+W) / 2时，小车向下运动。
6、（1分）（2）求AB段的绳索张力。以小车与滑轮A为对象，令AB段绳子的张力为T，对固定轴A写动量矩定理方程，有 （5分）可以得出 （1分） 第 5 页（共 5 页） （英文版 ） easily blame, to prevent the broken window effect. Supervise the leading cadres to play an exemplary role, take the lead in the strict implementation of the and , lead to safeguard the solemnity and authority o
7、f the party discipline, ensure that the party discipline and the laws and regulations for implementation in place. Throughout the discipline in the daily supervision and management, strengthen supervision and inspection, from the thorough investigation of violations of discipline behavior. Strengthe
8、n to key areas, key departments and key projects as well as the masses reflect the concentration of the units and departments for supervision. - strengthening supervision, discipline inspection and supervision of cadres to set an example for compliance with the and is a man must be hexyl, blacksmith
9、 needs its own hardware. Discipline inspection organs as the executor of the party discipline, and supervisor of the defenders, for its supervision must be more strictly, discipline inspection and supervision of cadres to firmly establish the awareness of Party Constitution, sense of discipline and
10、rules consciousness, politics loyalty, sense obey. Action speak Ji Ordinance to set an example of the regulations of the rule of law, strengthen supervision and accept the supervision of the firmness and consciousness, do comply with and . To firmly establish the discipline must first be disciplined
11、, the supervisor will be subject to the supervision of concept, and consciously safeguard and implement party compasses party, take the lead in practicing three strict real strict, so loyal, clean, play. To be good at learning, the Constitution and the as morality, politics and brought to fruition;
12、to implement , do not want to, dare not, not with disciplinary ruler to supervision; to discipline a ruler, often the control inspection, and consciously in the ideological red line to draw the row Ming Good accumulation is indeed the bottom line, so that the heart has fear, said to have quit, the l
13、ine has ended. Attached: indifferent to heart, calmly to the table in our life, there are many unpredictable things will happen, some good, some bad things, we cannot control is powerless to stop, but with time, you will find in life sometimes turns out to be not good, some bad things finally turned
14、 out to be a good thing, but then we muddy however did not know, this is the life teach us things. 1, life can be complex, can also be simple. Want simple life of precipitation, to have enough time to reflect, to make Become more perfect. Life is the most important thing is not to win, but the strug
15、gle; not to have conquered, but to have fought well. 2, the plain is the background of life. Live a plain life, give up on themselves is not a coward, but the wise answers; not disillusioned after the heart, such as ashes, but experience the storm after the enlightenment; not unrewarding perfunctori
16、ly, but calm attitude of life of unrestrained self-confidence. Plain living, there is no noise noisy, no earthly troubles, more did not fill in the discontent of desire, some just a calm, a calm. 3, memory of heart will not good things to erase the, life is a When no movie, pain is a beginning, the
17、struggle is a kind of process, death is a kind of ending. Give up this giving up is the helpless, do not give up the abandoned, do not give up this giving up is ignorance, do not give up should not give up is persistent. 4, a thing figured is heaven, think impassability is hell. Since the living, to
18、 live better. Sometimes we because of too narrow-minded, too care around the chores and penny wise and pound foolish, not worth the candle. Some things to attract trouble and worry, completely depends on how we look at and deal with it. Dont always take everything back to things, and dont get into a
19、 blind alley, dont want to face, dont be narrow-minded. Poke to care, is a kind of open-minded, a free and easy. 5, I am not afraid of others behind me a knife, I afraid to look back and see stab me, is my intention to treat people; I am not afraid of the truth to tell the best friend, Im afraid he
20、turned to it as a joke to tell dont 6, when we are in a positive frame of mind, you will find many good things; and when we are in a negative state of mind, you will find many depressed things; life happy and worry, all is you of life attitude, optimistic, good luck; loss of sink, Eritrea company. W
21、hen you are in adversity, may wish to change a point of view to think everything over to the good Think, because good mentality decided the fate of the! 7, people are tired, rest; heart tired, calm. Grow up, mature, this society read. Tired and sad, squat down, to their a hug. Because the world no o
22、ne can sympathize with you, have mercy on you. You cry, tears is your own; you pain, no one can understand. Then you only tears to smile. 8, each people have youth,Each youth are a story, the life of the world never gets easier, I want what, wish the world all know, as has been the same; now want an
23、ything, for fear that others know, or like to lose the same. 9, the heart move, everything in the world is followed by birth, Rangrang, important thing is often the most difficult to open ones mouth, because words will reduce its importance; to let strangers people care about your life in the good t
24、hings, the original is not easy 10, do not blame, do not laugh at who, also dont envy who. Like a person is a kind of feeling, not like a person is true. The truth is easy to explain, I feel Is unspeakable. The best travel life is that you in a strange place found a long lost touched. 11, happy life
25、 not in the bustling in, and in the peace of mind; no matter how many grievances, how uncomfortable, and ultimately to heal themselves or their own, others may got you to comfort, but never know your heart is how wanjianchuanxin. 12, maam, like a movie, learn to appreciate, learn to be grateful, lea
26、rn tolerance, and goodness, helping others. Instead of accusing the society, as into one; and an exception is better to give than to what 13, dont envy him A sum of, dont lose your life and the life, respectively is: the former is a we experienced cannot escape in a day finally will last minute, whi
27、le the latter is our persistent, we want to cherish the memory of those people and things. 14, learn to smile, learn to strong, the world you know so many people, so many people and you are, you cannot change also cant let everyone like you, so also do not want to do. Life is too short to go crazy t
28、o love to go to waste, to chase the dream to regret. 15, when temper, a blessing to go. A wounding elegant people, the key is to control their own emotions. With the mouth is the most stupid behavior. A control negative emotions than a can take a city more powerful water flow slow, language is expen
29、sive. People spent two years of time to learn to speak, but to spend a few years time to shut up. That is a kind of ability, that is a kind of wisdom. 16, life is not perfect, sometimes, growth is not a cry, not an eyeful of tears, there is no trace of emotion, there is no gleam of hope, no desire,
30、no action, no static, there is only one kind of downward sinking feeling, sink A murky? 6? 7? 6? 7 sink? 6? 7? 6? 7 toward the bottom of the sink. 17, in some way, do not go, you will not know the other side scenery is beautiful. To you is not good, you do not mind too much, no one has an obligation
31、 to you; you learn knowledge, is you have weapons, you can start from scratch, but not unarmed; how do you treat people, does not represent how others treat you, if cannot see through this point, only inviting worry. 18, time is like a sponge in the water, as long as you are willing to squeeze, the
32、total water is still there. Every life, after the ups and downs The best test of live, to life, survival and continuation, do not stop the struggle in the joys and sorrows of life on the road, so that different soul to bear life beat, acceptance of suffering. 19, indifferent to heart, calmly in tabl
33、e, elegant and comfortable life, do not take what is so important. The pursuit will be disappointed; to be alive, you will have trouble. Life is the most afraid of what all want to care about, but also what all grasp is not firm, without scenery, separated populations, such as not to desire, all doc
34、ked in the fate of the end. Why is too rigid, the natural, to go stay not to live, let go of obsession, revel is 20, if the fate of the broken Hopes of sailing, please dont despair, the coast is still, if the fate of the withered petals of the beautiful, please do not sink, the spring is still, life
35、 will always be endless trouble, please dont helpless, because they are still alive, is still a dream, the sun still, we still. Lost, keep memories; to get, must work to; but the most important is good to cherish their own. 21, life, select the complex, is to choose the pain; choose a simple, is cho
36、ose to be happy. The complex world like aSignificance of pride. Hope is the ornate palace, outside people admiring the magnificent, living in the deep knowledge of living it to pay the price. Simple world as a simple log cabin outside ridiculed shabby, the heart is willing to go live to know the joy
37、. Suffering and joy is their own choice. 22, learn how to use a single powerful heart, let the past be the past, let the future come. Life is really the end of the end of an eagle is flying wings, life is constantly pursuit. Dont miss to regret, dont wait for old just miss. Time to return, seize eve
38、ry moment, again painstakingly again tired also Those struggling to fly. 23, life could not Yimapingchuan, even flat pavement, inevitably there will be a few pieces of roadblocks. Some of the rocks around the past, while others have to move it out. Just move others put the stone is very easy, becaus
39、e the stone from the appearance we can discern; difficult to myself to move away the heart of stone head. Leave time to spend with her, often reflect my heart, so as to remove your heart of stone. 24, everything does not have to be demanding, come to, everything does not have to care about, over the
40、 past; failing to do not frown, laugh it laugh. Results Dont demand, do to; life is a simple, calm and peaceful. Always not to choose their own path and regret, life is like a train, the scenery and then the United States will retreat, the passage of time and encounter will eventually drifting furth
41、er and further away, before is always himself. 25, everyone has a weakness, weakness is true humanity. That has no weakness, a shallow person. That people think there is no weakness, mostly false. Life has shortcomings, there are shortcomings is the real life. That no one regret, or childish or numb
42、ness or Self deception. It is in tolerance of weakness and so on to accept, people live happily.Hello, everyone! I am a party member. The title of my speech is: study and implement the partys two laws, doing practical play highway. 2015 October 18, the Central Committee of the Communist Party of Chi
43、na promulgated the implementation of the and Chinese Communist Party discipline and punishment regulations. We Heyuan male passers-by to respond positively to the call of the Central Committee of the party, earnestly organize the study party two regulations, truly grasp the essence and gist, and in their respective positions, to hold the bottom line of the discipline, build a strong ideological line of defense, with the courage to play, the