《理论力学》武汉理工大学20春作业一
理论力学-作业一1.[单选题] <p class="MsoNormal"><span style="font-family:宋体">已知质点沿</span><i><span lang="EN-US">x</span></i><span style="font-family:宋体">轴做直线运动，某瞬时速度为</span><span lang="EN-US" style="font-family:Symbol">u</span><i><sub><span lang="EN-US">x </span></sub></i><span lang="EN-US">= <i>x </i>= 2 m/s</span><span style="font-family:宋体">，瞬时加速度为</span><i><span lang="EN-US">a<sub>x</sub></span></i><span lang="EN-US"> = <span style="position:relative;top:3.0pt"><img width="12" height="17" id="对象 5" src="http://wljy.whut.edu.cn//uploadfiles/word/lllx001.files/image005.png"></span><i> </i>= -2 m/s<sup>2</sup></span><span style="font-family:宋体">，则</span><span lang="EN-US">1 s</span><span style="font-family:宋体">以后点的速度大小</span><span lang="EN-US">( )</span><span style="font-family:宋体">。</span>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"> </span>
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A.等于零
B.等于－2 m/s
C.等于－4 m/s
D.无法确定
正确答案:——D——
2.[单选题] 刚体做定轴转动时，刚体上点的切向加速度为( )。
A.rw
B.re
C.rw2
D.r2w
正确答案:——B——
3.[单选题] <p class="MsoNormal"> <span style="font-family:Microsoft Yahei;">边长</span><i><span>b </span></i><span>=100 <i>mm</i> </span><span style="font-family:Microsoft Yahei;">的正方形均质板重</span><span>400N</span><span style="font-family:Microsoft Yahei;">，由三根绳拉住，如图所示，当</span><b><i><span>AD</span></i></b><span style="font-family:Microsoft Yahei;">和</span><b><i><span>BE</span></i></b><span style="font-family:Microsoft Yahei;">两绳运动到铅垂位置时，</span><span>AD </span><span style="font-family:Microsoft Yahei;">绳的张力（</span><span><span> </span></span><span style="font-family:Microsoft Yahei;">）。<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120100416_157.png" alt="" /></span>
<p class="MsoNormal"> <span> </span>
A.<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120102338_794.png" alt="" />
B.<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120102348_333.png" alt="" />
C.<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120100444_749.png" alt="" />
D.<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120100456_506.png" alt="" /><span style="font-size:12pt;"></span>
正确答案:——A——
4.[单选题] 在平衡问题中，若未知数的数量（ ）所能建立的独立平衡方程的数量，称为静定问题。
A.不超过
B.超过
C.等于
D.小于
正确答案:————
5.[单选题] 在点的合成运动问题中，当牵连运动为定轴转动时（ ）。
A.一定会有科氏加速度
B.不一定会有科氏加速度
C.一定没有科氏加速度
D.以上都不对
正确答案:————
6.[单选题] <p class="MsoNormal"> <span style="font-family:Microsoft Yahei;">边长</span><i><span>b </span></i><span>=100 <i>mm</i> </span><span style="font-family:Microsoft Yahei;">的正方形均质板重</span><span>400N</span><span style="font-family:Microsoft Yahei;">，由三根绳拉住，如图所示，当</span><b><i><span>FG</span></i></b><span style="font-family:Microsoft Yahei;">绳被剪断的瞬时，</span><b><i><span>BE</span></i></b><span style="font-family:Microsoft Yahei;">绳的张力（</span><span><span> </span></span><span style="font-family:Microsoft Yahei;">）；<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120100325_800.png" alt="" /></span>
<p class="MsoNormal"> <span> </span>
A.<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120100334_246.png" alt="" />
B.<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120100341_248.png" alt="" />
C.<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120102304_79.png" alt="" />
D.<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120100404_967.png" alt="" />
正确答案:————
7.[单选题] <p class="MsoNormal"><span style="font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">边长为</span><i style="mso-bidi-font-style:normal"><span lang="EN-US">L</span></i><span style="font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">的均质正方形平板，位于铅垂平面内并置于光滑水平面上，如图示，若给平板一微小扰动，使其从图示位置开始倾倒，平板在倾倒过程中，其质心</span><i style="mso-bidi-font-style:normal"><span lang="EN-US">C</span></i><span style="font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">点的运动轨迹是（</span><span lang="EN-US"><span style="mso-spacerun:yes"> </span></span><span style="font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">）。</span>
<p class="MsoNormal"><span lang="EN-US"><v:shape id="_x0000_i1051" type="#_x0000_t75" style="width:135pt;height:93.6pt" o:allowoverlap="f"> <v:imagedata src="LLLXDX.files/image022.png" o:title="二" croptop="14605f" cropbottom="7170f" cropleft="3747f" cropright="6206f" /> </v:shape></span>
A.半径为L/2的圆弧
B.抛物线
C.椭圆曲线
D.铅垂直线
正确答案:————
8.[单选题] 力对物体作用效果，可使物体（ ）。
A.产生运动
B.产生内力
C.产生变形
D.运动状态发生改变和产生变形
正确答案:————
9.[单选题] 关于虚位移说法不正确的（ ）。
A.假想的
B.随意指定的
C.与主动力无关
D.确定的
正确答案:————
10.[单选题] <p class="MsoNormal"> <span style="font-family:Microsoft Yahei;">在图示机构中，杆</span><i><span>O</span></i> <sub><span>1 </span></sub> <i><span>A</span></i> <img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205090332_661.png" /><span> <i>O</i><sub>2 </sub><i>B</i></span><span style="font-family:Microsoft Yahei;">，杆</span><i><span>O</span></i> <sub><span>2 </span></sub> <i><span>C</span></i> <img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120090742_155.png" /><span> <i>O</i><sub>3 </sub><i>D</i></span><span style="font-family:Microsoft Yahei;">，且</span><i><span>O</span></i> <sub><span>1 </span></sub> <i><span>A</span></i> <span> =200mm</span><span style="font-family:Microsoft Yahei;">，</span><i><span>O</span></i> <sub><span>2 </span></sub> <i><span>C</span></i> <span> =400mm</span><span style="font-family:Microsoft Yahei;">，</span><i><span>CM</span></i><span> = <i>MD</i> =300mm</span><span style="font-family:Microsoft Yahei;">，若杆</span><i><span>AO</span></i><sub><span>1 </span></sub><span style="font-family:Microsoft Yahei;">以角速度</span> <img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205090339_254.png" /><span> = 3 rad / s </span><span style="font-family:Microsoft Yahei;">匀速转动，则</span><i><span>D</span></i><span style="font-family:Microsoft Yahei;">点的速度的大小为</span><u><span><span> </span></span></u><span>cm/s</span><span style="font-family:Microsoft Yahei;">。<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205090411_863.png" /></span>
<p class="MsoNormal"> <span> </span>
A. 60
B. 120
C. 150
D. 360
正确答案:————
11.[单选题] <p class="MsoNormal"><span style="font-family:宋体">如下图所示，将大小为</span><span lang="EN-US">100 N</span><span style="font-family:宋体">的力</span><b><i><span lang="EN-US">F</span></i></b><span style="font-family:宋体">沿</span><i><span lang="EN-US">x</span></i><span style="font-family:宋体">、</span><i><span lang="EN-US">y</span></i><span style="font-family:宋体">方向分解，若</span><i><span lang="EN-US">F</span></i><span style="font-family:宋体">在</span><i><span lang="EN-US">x</span></i><span style="font-family:宋体">轴上的投影为</span><span lang="EN-US">86.6 N</span><span style="font-family:宋体">，而沿</span><i><span lang="EN-US">x</span></i><span style="font-family:宋体">方向的分力的大小为</span><span lang="EN-US">115.47 N</span><span style="font-family:宋体">，则</span><b><i><span lang="EN-US">F</span></i></b><span style="font-family:宋体">在</span><i><span lang="EN-US">y</span></i><span style="font-family:宋体">轴上的投影为</span><span lang="EN-US">( )</span><span style="font-family:宋体">。</span>
<p class="MsoNormal"><span lang="EN-US"><img width="150" height="72" id="图片 2" src="http://wljy.whut.edu.cn//uploadfiles/word/lllx001.files/image002.jpg"></span>
A.0
B.50 N
C.70.7 N
D.86.6 N
E.100 N
正确答案:————
12.[单选题] <p class="MsoNormal"><span style="font-family:宋体">在下图所示机构中，杆</span><i><span lang="EN-US">O</span></i><sub><span lang="EN-US">1</span></sub><i><span lang="EN-US">A</span></i><u><span style="font-family:宋体">∥</span></u><i><span lang="EN-US">O</span></i><sub><span lang="EN-US">2</span></sub><i><span lang="EN-US">B</span></i><span style="font-family:宋体">，杆</span><i><span lang="EN-US">O</span></i><sub><span lang="EN-US">2</span></sub><i><span lang="EN-US">C</span></i><u><span style="font-family:宋体">∥</span></u><i><span lang="EN-US">O</span></i><sub><span lang="EN-US">3</span></sub><i><span lang="EN-US">D</span></i><span style="font-family:宋体">，且</span><i><span lang="EN-US">O</span></i><sub><span lang="EN-US">1</span></sub><i><span lang="EN-US">A</span></i><span lang="EN-US"> = 200 mm</span><span style="font-family:宋体">，</span><i><span lang="EN-US">O</span></i><sub><span lang="EN-US">2</span></sub><i><span lang="EN-US">C</span></i><span lang="EN-US"> = 400 mm</span><span style="font-family:宋体">，</span><i><span lang="EN-US">CM</span></i><span lang="EN-US"> = <i>MD</i> = 300 mm</span><span style="font-family:宋体">，若杆</span><i><span lang="EN-US">AO</span></i><sub><span lang="EN-US">1</span></sub><span style="font-family:宋体">以角速度</span> <i><span lang="EN-US" style="font-family:Symbol">w</span><span lang="EN-US"> </span></i><span lang="EN-US">=3 rad/s</span><span style="font-family:宋体">匀速转动，则点</span><i><span lang="EN-US">D</span></i><span style="font-family:宋体">的速度的大小为</span><u><span lang="EN-US"> </span></u><span lang="EN-US">cm/s</span><span style="font-family:宋体">，点</span><i><span lang="EN-US">M</span></i><span style="font-family:宋体">的加速度的大小为</span><u><span lang="EN-US"> </span></u><span style="font-family:宋体">。则横线上正确的是</span><span lang="EN-US">( )</span><span style="font-family:宋体">。</span>
<p class="MsoNormal"><span lang="EN-US"><img width="172" height="91" id="图片 14" src="http://wljy.whut.edu.cn//uploadfiles/word/lllx001.files/image010.jpg"></span>
A.60 cm/s2 120 cm/s2
B.120 cm/s2 60 cm/s2
C.120 cm/s2 150 cm/s2
D.120 cm/s2 360 cm/s2
正确答案:————
13.[单选题] 全约束反力与法线间的夹角的最大值称为（ ）。
A.反力角
B.平衡角
C.约束角
D.摩擦角
正确答案:————
14.[单选题] <p class="MsoNormal"><span style="font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">正立方体的顶角上作用着六个大小相等的力，此力系向任一点简化的结果是（</span><span lang="EN-US"><span style="mso-spacerun:yes"> </span></span><span style="font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">）。</span>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><v:shape id="_x0000_i1048" type="#_x0000_t75" style="width:125.4pt;height:129pt" o:allowoverlap="f"> <v:imagedata src="LLLXDX.files/image019.png" o:title="二" croptop="1670f" cropbottom="9899f" cropleft="7359f" /> </v:shape></span>
A.主矢等于零，主矩不等于零
B.主矢不等于零，主矩也不等于零
C.主矢不等于零，主矩等于零
D.主矢等于零，主矩也等于零
正确答案:————
15.[单选题] 空间力偶矩是（ ）。
A.代数量
B.滑动矢量
C.定位矢量
D.自由矢量
正确答案:————
16.[单选题] <p class="MsoNormal"><span style="font-family:宋体">重为</span><b><i><span lang="EN-US">P</span></i></b><span style="font-family:宋体">的均质圆柱放在</span><span lang="EN-US">V</span><span style="font-family:宋体">形槽里，考虑摩擦。当圆柱上作用有一力偶，其矩为</span><i><span lang="EN-US">M</span></i><span style="font-family:宋体">时</span><span lang="EN-US">(</span><span style="font-family:宋体">见下图</span><span lang="EN-US">)</span><span style="font-family:宋体">，圆柱处于极限平衡状态。此时接触点</span><i><span lang="EN-US">A</span></i><i><span style="font-family:宋体">、</span><span lang="EN-US">B</span></i><span style="font-family:宋体">处的法向约束力</span><i><span lang="EN-US">F</span></i><sub><span lang="EN-US">N<i>A</i></span></sub><span style="font-family:宋体">与</span><i><span lang="EN-US">F</span></i><sub><span lang="EN-US">N<i>B</i></span></sub><span style="font-family:宋体">的关系为</span><span lang="EN-US">( )</span><span style="font-family:宋体">。</span>
<p class="MsoNormal"><span lang="EN-US"><img width="155" height="92" id="图片 12" src="http://wljy.whut.edu.cn//uploadfiles/word/lllx001.files/image008.jpg"></span>
A.FNA= FNB
B.FNA ＞ FNB
C.FNA ＜ FNB
正确答案:————
17.[单选题] <p class="MsoNormal"><span style="font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">图示力</span><span lang="EN-US">F<sub>1</sub></span><span style="font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">、</span><span lang="EN-US">F<sub>2</sub></span><span style="font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">、</span><span lang="EN-US">F<sub>3</sub></span><span style="font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">和</span><span lang="EN-US">F<sub>4</sub></span><span style="font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">分别在坐标轴</span><span lang="EN-US">X</span><span style="font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">上的投影的计算式为（）。</span>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><v:shape id="_x0000_i1029" type="#_x0000_t75" style="width:153.6pt;height:90.6pt"> <v:imagedata src="LLLXDX.files/image005.png" o:title="" /> </v:shape></span>
A.X1=-F1cosα1
B.X2=-F1cosα2
C.X3=-F1cosα3
D.X4=-F1cosα4
正确答案:————
18.[单选题] （ ）物体的重心与形心重合。
A.匀质物体
B.刚体
C.组合体
D.单体
正确答案:————
19.[单选题] 理论力学的三部分内容中（ ）涉及研究机械运动的时空特性。
A.静力学
B.运动学
C.动力学
D.轨迹学
正确答案:————
20.[单选题] 图示四个力四边形中，表示力矢R是F1、F2和F3的合力图形是（）。
A.<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203165458_232.png" />
B.<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120075656_30.png" />
C.<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203164832_984.png" />
D.<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203165538_628.png" />
正确答案:————
21.[单选题] <p class="MsoNormal"> <span style="font-family:Microsoft Yahei;">一水平简支梁结构，约束和载荷如图所示，求支座</span><i><span>A</span></i><span style="font-family:Microsoft Yahei;">的约束反力。<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203171114_385.png" /></span>
<p class="MsoNormal"> <span> </span>
A.<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203170445_32.png" />
B.<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120094843_380.png" />
C.<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203172415_519.png" />
D.<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203170514_962.png" />
正确答案:————
22.[单选题] <p class="MsoNormal"> <span style="font-family:Microsoft Yahei;">图示机构，构件的重量和摩擦力忽略不计，试确定主动力</span><b><i><span>F</span></i></b><span style="font-family:Microsoft Yahei;">（垂直于</span><i><span>AB</span></i><span style="font-family:Microsoft Yahei;">）和主动力矩</span><b><i><span>M</span></i></b><span style="font-family:Microsoft Yahei;">的关系。<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120110020_940.png" alt="" /></span>
<p class="MsoNormal"> <span> </span>
A. 等于
B. 不等于
C. 大于
D. 小于
正确答案:————
23.[单选题] <p class="MsoNormal"> <span style="font-family:Microsoft Yahei;">图示</span><span>(a</span><span style="font-family:Microsoft Yahei;">）</span><span>(b</span><span style="font-family:Microsoft Yahei;">）</span><span>(c</span><span style="font-family:Microsoft Yahei;">）三种荷载作用下，梁</span><span>AB</span><span style="font-family:Microsoft Yahei;">的支座反力为（</span><span><span> </span></span><span style="font-family:Microsoft Yahei;">）<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120104250_492.png" alt="" /></span>
<p class="MsoNormal"> <span> </span>
A. （a） A=m/l(↓）B=m/l(↑）(b）A=0B=P (↑） (C） A=P/2(↑）B=P/2(↑）
B. （a） A=m/l(↑）B=m/l(↑）(b）A= P (↑）B=0 (C） A=P/2(↓）B=P/2(↑）
C. （a） A=m/l(↓）B=m/l(↓）(b）A=0B=P (↑） (C） A=P/2(↑）B=P/2(↑）
D. （a） A=m/l(↓）B=m/l(↑）(b）A=0B=P (↑） (C） A=P/2(↓）B=P/2(↑）
正确答案:————
24.[单选题] 某空间力系，若各力作用线分别平行两固定点的连线，则其独立的平衡方程式的最大数目为( )个。
A.3
B.4
C.5
D.6
E.2
正确答案:————
25.[单选题] <p class="MsoNormal"> <span style="font-family:Microsoft Yahei;">边长</span><i><span>b </span></i><span>=100 <i>mm</i> </span><span style="font-family:Microsoft Yahei;">的正方形均质板重</span><span>400N</span><span style="font-family:Microsoft Yahei;">，由三根绳拉住，如图所示。当</span><b><i><span>FG</span></i></b><span style="font-family:Microsoft Yahei;">绳被剪断的瞬时，</span><b><i><span>AD</span></i></b><span style="font-family:Microsoft Yahei;">绳的张力（</span><span><span> </span></span><span style="font-family:Microsoft Yahei;">）；<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120100223_525.png" /></span>
<p class="MsoNormal"> <span> </span>
A.<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203165410_735.png" />
B.<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203165425_122.png" />
C.<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203165436_629.png" />
D.<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203171357_3.png" />
正确答案:————
26.[单选题] <p class="MsoNormal"><span style="font-family:宋体">如下图所示，正方体仅受两个力偶作用，该两力偶矩矢等值、反向，即</span><b><i><span lang="EN-US">M</span></i></b><sub><span lang="EN-US">1</span></sub><span lang="EN-US"> = <b><i>M</i></b><sub>2</sub></span><span style="font-family:宋体">，但二者不共线，则正方体</span><span lang="EN-US">( )</span><span style="font-family:宋体">。</span>
<p class="MsoNormal"><span lang="EN-US"><img width="121" height="122" id="图片 1" src="http://wljy.whut.edu.cn//uploadfiles/word/lllx001.files/image001.jpg"></span>
A.平衡
B.不平衡
C.因条件不足，难以判断是否平衡
正确答案:————
27.[单选题] 某空间力系，若各力作用线均通过某一固定点，则其独立的平衡方程式的最大数目为( )个。
A.3
B.4
C.5
D.6
E.2
正确答案:————
28.[单选题] 关于平面力偶的性质错误的是（ ）
A.力偶不能与一个力等效，也不能与一个力平衡
B.平面力偶对平面内任意一点的矩恒等于力偶矩
C.两个平面力偶等效的充分必要条件是力偶矩相等
D.力偶在作用平面上在同一刚体内部任意移转，影响力偶对刚体的转动效应。
正确答案:————
29.[单选题] <p class="MsoNormal"> <span style="font-family:Microsoft Yahei;">直角刚杆</span><i><span>AO</span></i><span> =2m</span><span style="font-family:Microsoft Yahei;">，</span><i><span>BO </span></i><span>=3m</span><span style="font-family:Microsoft Yahei;">，已知某瞬时</span><i><span>A</span></i><span style="font-family:Microsoft Yahei;">点的速度</span> <img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120084110_154.png" /><span> =6m/s</span><span style="font-family:Microsoft Yahei;">；而</span><i><span>B</span></i><span style="font-family:Microsoft Yahei;">点的加速度与</span><i><span>BO</span></i><span style="font-family:Microsoft Yahei;">成</span><span> <img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205084315_864.png" />= 60</span><span style="font-family:Microsoft Yahei;">°角。则该瞬时刚杆的角加速度</span><span> <img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205090235_242.png" />=</span><u><span style="font-family:Microsoft Yahei;">（</span><span><span> </span></span></u><u><span style="font-family:Microsoft Yahei;">）</span></u><span>rad/s<sup>2</sup></span><span style="font-family:Microsoft Yahei;">。<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120084155_324.png" /></span>
<p class="MsoNormal"> <span style="font-size:12pt;"> </span>
A.3
B.<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203165738_11.png" />
C.<p class="MsoNormal" style="display:inline;"> <img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203170233_384.png" />
D.<p class="MsoNormal" style="display:inline;"> <img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203165237_800.png" />
正确答案:————
30.[单选题] <p class="MsoNormal"> <span style="font-family:Microsoft Yahei;">平面运动刚体上三个点</span><span>A</span><span style="font-family:Microsoft Yahei;">、</span><span>B</span><span style="font-family:Microsoft Yahei;">、</span><span>C</span><span style="font-family:Microsoft Yahei;">构成等边三角形，某瞬时各点加速度或速度矢量如图</span><span>2</span><span style="font-family:Microsoft Yahei;">所示。则图</span><span>2</span><span style="font-family:Microsoft Yahei;">中——所示的运动是可能的。<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120105621_108.png" alt="" /></span>
<p class="MsoNormal"> <span style="font-size:12.0pt;"> </span>
A. 图2（a）
B. 图2（b）
C. 图2 （a）和（b）
D. 以上都不对
正确答案:————
31.[单选题] 平面一般力系的平衡方程可以求解（ ）个未知数。
A.1
B.2
C.3
D.4
正确答案:————
32.[单选题] 力的可传性不适用于（ ）。
A.刚体
B.二力杆
C.变形体
D.隔离体
正确答案:————
33.[单选题] 第二类拉格朗日方程不可用于研究具有（）质点系的力学问题。
A.完整约束 奥鹏作业答案
B.定常约束
C.非完整约束
D.非定常约束
正确答案:————
34.[单选题] 在点的合成运动问题中，当牵连运动为定轴转动时( )。
A.一定会有科氏加速度
B.不一定会有科氏加速度
C.一定没有科氏加速度
正确答案:————
35.[单选题] <p class="MsoNormal"> <span style="font-family:Microsoft Yahei;">四根杆件用铰链连接如图</span><span>6</span><span style="font-family:Microsoft Yahei;">所示，在水平杆</span><span>AB</span><span style="font-family:Microsoft Yahei;">上作用有一力偶矩为</span><i><span>M</span></i><span style="font-family:Microsoft Yahei;">的力偶，不计构件自重，则系统平衡时，铅垂杆</span><span>AC</span><span style="font-family:Microsoft Yahei;">的内力</span><i><span>F</span></i><span>=</span><span style="font-family:Microsoft Yahei;">（</span><span><span> </span></span><span style="font-family:Microsoft Yahei;">）</span><i> </i><span style="font-family:Microsoft Yahei;">（拉力为正）。<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120095537_22.png" alt="" /></span>
<p class="MsoNormal"> <span> </span>
A. 10 N
B. 0 N
C. 12.5 N
D. 5 N
正确答案:————
36.[单选题] <p class="MsoNormal"> <span style="font-family:Microsoft Yahei;">结构及其受力如图</span><span>4</span><span style="font-family:Microsoft Yahei;">所示，已知均布载荷集度</span><i><span>q</span></i><span>=10N/m</span><span style="font-family:Microsoft Yahei;">，力偶矩的大小</span><span>M=5N</span><span style="font-family:Microsoft Yahei;">·</span><span>m</span><span style="font-family:Microsoft Yahei;">，</span><span>a=1m</span><span style="font-family:Microsoft Yahei;">，不计结构自重。则</span><span>CD</span><span style="font-family:Microsoft Yahei;">杆上</span><span>C</span><span style="font-family:Microsoft Yahei;">端所受的约束力的大小为</span><i><span>F</span></i><span>= </span><span style="font-family:Microsoft Yahei;">（</span><span><span> </span></span><span style="font-family:Microsoft Yahei;">）</span><span>N</span><span style="font-family:Microsoft Yahei;">。<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120095315_305.png" alt="" /></span>
<p class="MsoNormal"> <span style="font-size:12.0pt;"> </span>
A. 10N
B. 15N
C. 12.5N
D. 5N
正确答案:————
37.[单选题] 研究点的平面曲线运动，不是通常采用的方法（ ）
A.矢量法
B.自然法
C.图像法
D.直角坐标法
正确答案:————
38.[单选题] 力是（ ）
A.定位矢量
B.变矢量
C.标量
D.只与方向有关
正确答案:————
39.[单选题] <p class="MsoNormal"><span style="font-family:宋体">如下图所示，正立方体的顶角上作用着六个大小相等的力，此力系向任一点简化的结果是</span><span lang="EN-US">( )</span><span style="font-family:宋体">。</span>
<p class="MsoNormal"><span lang="EN-US"><img width="110" height="120" id="图片 11" src="http://wljy.whut.edu.cn//uploadfiles/word/lllx001.files/image007.jpg"></span>
A.主矢等于零，主矩不等于零
B.主矢不等于零，主矩也不等于零
C.主矢不等于零，主矩等于零
D.主矢等于零，主矩也等于零
正确答案:————
40.[单选题] <p class="MsoNormal"><span style="font-family:宋体">曲柄</span><i><span lang="EN-US">OA</span></i><span style="font-family:宋体">以匀角速度转动，当系统运动到下图所示位置</span><span lang="EN-US">(<i>OA</i>//<i>O</i><sub>1</sub><i>B</i></span><span style="font-family:宋体">，</span><i><span lang="EN-US">AB</span></i><span style="font-family:宋体">⊥</span><i><span lang="EN-US">OA</span></i><span lang="EN-US">)</span><span style="font-family:宋体">时，则有</span><i><span lang="EN-US">v<sub>A</sub></span></i><u><span lang="EN-US"> </span></u><i><span lang="EN-US">v<sub>B</sub></span></i><span style="font-family:宋体">，</span><b><i><span lang="EN-US">a</span></i></b><i><sub><span lang="EN-US">A</span></sub></i><u><span lang="EN-US"> </span></u><b><i><span lang="EN-US">a</span></i></b><i><sub><span lang="EN-US">B</span></sub></i><span style="font-family:宋体">，</span><i><span lang="EN-US" style="font-family:Symbol">w</span><sub><span lang="EN-US">AB</span></sub></i><u><span lang="EN-US"> </span></u><span lang="EN-US">0</span><span style="font-family:宋体">，</span><i><span lang="EN-US" style="font-family:Symbol">a</span><sub><span lang="EN-US">AB</span></sub></i><u><span lang="EN-US"> </span></u><span lang="EN-US">0</span><span style="font-family:宋体">。若记</span><span style="font-family:宋体">①等于，②不等，则横线上正确的答案是（<span lang="EN-US"> </span>）</span>
<p class="MsoNormal"><span lang="EN-US"><img width="143" height="119" id="图片 15" src="http://wljy.whut.edu.cn//uploadfiles/word/lllx001.files/image011.jpg"></span>
A.①②①②
B.②①②①
C.①①②②
D.②②①①
正确答案:————
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