西工大19秋《理论力学》在线作业

adminhan

<img width="603" height="620" alt="" src="http://file.open.com.cn/ItemDB/130972/72a8dd63-7781-421a-8a26-f50ebe4c34b4/20141229155222775.jpg" />1
A:A
B:B
C:C
D:D

<img width="556" height="353" alt="" src="http://file.open.com.cn/ItemDB/130972/c871f7f9-df14-447c-aa94-3829b4064aa9/20141229172745386.jpg" />1
A:A
B:B
C:C
D:D

<img width="592" height="598" alt="" src="http://file.open.com.cn/ItemDB/130972/649041c5-ecd3-4c35-a823-8b41c2ac5e69/20141229162330160.png" />1
A:A
B:B
C:C
D:D

<img width="582" height="672" alt="" src="http://file.open.com.cn/ItemDB/130972/baadc261-ac58-4703-8b0b-8bbc6e57c64b/20141229165935477.png" />1
A:A
B:B
C:C
D:D

<p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">如图所示平面机构，可绕水平轴<font face="Helvetica Neue">O</font><font face="宋体">转动的直杆</font><font face="Helvetica Neue">OA</font><font face="宋体">搁在长方体</font><font face="Helvetica Neue">B</font><font face="宋体">的棱边上，长方体</font><font face="Helvetica Neue">B</font><font face="宋体">可沿水平面作直线平动。若取</font><font face="Helvetica Neue">OA</font><font face="宋体">杆上与长方体</font><font face="Helvetica Neue">B</font><font face="宋体">相接触的点</font><font face="Helvetica Neue">C</font><font face="宋体">为动点，动系固连于长方体上，则</font><font face="Helvetica Neue">C</font><font face="宋体">点的相对运动轨迹为（&nbsp;&nbsp;&nbsp;&nbsp;）。</font></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><img width="179" height="107" alt="" src="http://file.open.com.cn/ItemDB/130972/f6ed0207-c9ba-49aa-ba4e-3ee1524943fa/20141229165228851.jpg" /></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">A</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;圆周</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">B</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;沿<font face="Helvetica Neue">OA</font><font face="宋体">杆的直线</font></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">C</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;铅直线</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">D</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;无法直观确定</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><!--EndFragment-->
A:A
B:B
C:C
D:D

<img width="606" height="535" alt="" src="http://file.open.com.cn/ItemDB/130972/f7641a4d-4b0a-4428-9fdf-4b32ba749022/20141229164439130.png" />1
A:A
B:B
C:C
D:D

已知点M的运动方程为S=b+ct，其中b、c均为非零常数，则（ ）。
A:点M的轨迹必为直线
B:点M必作匀速直线运动
C:点M必作匀速运动
D:点M的加速度必定等于零

<img width="586" height="655" alt="" src="http://file.open.com.cn/ItemDB/130972/228f82dc-59a0-47f0-9e74-9fbac830f4e1/20141229163119662.png" />1
A:A
B:B
C:C
D:D

一般情况下，点的加速度合成定理最多能确定（ ）个待求量（包括大小、方向）。
A:1
B:2
C:3
D:4

<img width="590" height="656" alt="" src="http://file.open.com.cn/ItemDB/130972/f0591884-d51d-417b-bb22-e8d39216f156/20141229162744638.png" />1
A:A
B:B
C:C
D:D

<img width="576" height="530" alt="" src="http://file.open.com.cn/ItemDB/130972/65d9fa50-f267-4d7b-9c09-ff8d3ee60954/201412300057736.jpg" />1
A:A
B:B
C:C
D:D

<span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><p style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">如图所示，匀质长方体的高度<font face="Helvetica Neue">h</font><font face="宋体">为</font><font face="Helvetica Neue">30</font><font face="宋体">厘米，&nbsp;宽度</font><font face="Helvetica Neue">b</font><font face="宋体">为</font><font face="Helvetica Neue">20</font><font face="宋体">厘米，重量</font><font face="Helvetica Neue">G=600N</font><font face="宋体">，放在粗糙水</font></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><!--EndFragment-->平面上，它与水平面的静摩擦系数<font face="Helvetica Neue">f</font><font face="宋体">是</font><font face="Helvetica Neue">0.4</font><font face="宋体">。要使物体保持平衡，作用在其上的水平力</font><font face="Helvetica Neue">P</font><font face="宋体">的最大值为</font><font face="Helvetica Neue">(&nbsp;&nbsp;&nbsp;&nbsp;)</font><font face="宋体">牛。</font></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><img alt="" width="174" height="126" src="http://file.open.com.cn/ItemDB/130972/73de0974-fc2c-4207-a00d-9f0edca63fa8/2014122916369939.jpg" /></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">A</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;100</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">B</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;200</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">C</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;150</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">D</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;250</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><!--EndFragment--></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span>
A:A
B:B
C:C
D:D

<img width="638" height="598" alt="" src="http://file.open.com.cn/ItemDB/130972/cb604750-e9e9-4215-b1e6-ad7b701ee67a/20141229162426412.png" />1
A:A
B:B
C:C
D:D

<img width="586" height="367" alt="" src="http://file.open.com.cn/ItemDB/130972/003a9642-8573-4964-bf9c-6b0134eddd55/20141229124133152.png" />1
A:A
B:B
C:C
D:D

<img width="568" height="539" alt="" src="http://file.open.com.cn/ItemDB/130972/d686fbd5-4975-4149-8f92-3e6562ffa136/2014122916164189.jpg" />1
A:A
B:B
C:C
D:D

<img width="573" height="326" alt="" src="http://file.open.com.cn/ItemDB/130972/949273a4-9547-48d9-b34c-1a1536ef2258/20141229124553258.png" />1
A:A
B:B
C:C
D:D

<p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">结构的节点<font face="Helvetica Neue">O</font><font face="宋体">上作用着四个共面力，各力的大小分别为：</font><font face="Helvetica Neue">F1</font><font face="宋体">＝</font><font face="Helvetica Neue">150N</font><font face="宋体">，</font><font face="Helvetica Neue">F2</font><font face="宋体">＝</font><font face="Helvetica Neue">80N</font><font face="宋体">，</font><font face="Helvetica Neue">F3</font><font face="宋体">＝</font><font face="Helvetica Neue">140N</font><font face="宋体">，</font><font face="Helvetica Neue">F4</font><font face="宋体">＝</font><font face="Helvetica Neue">50N</font><font face="宋体">，方向如图所示，这四个力的合力为（&nbsp;&nbsp;）。</font></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">A</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;166N</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">B</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;180N</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">C</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;100N</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">D</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;200N</span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><img width="201" height="162" alt="" src="http://file.open.com.cn/ItemDB/130972/762a2da6-5475-4d6d-86c3-161a39717b64/20141229123452556.jpg" /></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><!--EndFragment-->
A:A
B:B
C:C
D:D

<p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">一平面任意力系向点<font face="Helvetica Neue">A</font><font face="宋体">简化后，得到如图所示的主矢&nbsp;和主矩&nbsp;，则该力系的最后合成结果应是（&nbsp;&nbsp;）。</font></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p><img width="99" height="131" alt="" src="http://file.open.com.cn/ItemDB/130972/c06dcce6-48db-4534-abcd-d532460a94ec/20141229173054315.jpg" /></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">A</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;作用在点<font face="Helvetica Neue">A</font><font face="宋体">左边的一个合力</font></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">B</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;作用在点<font face="Helvetica Neue">A</font><font face="宋体">右边的一个合力</font></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">C</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;作用在点<font face="Helvetica Neue">A</font><font face="宋体">的一个合力</font></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245); mso-para-margin-bottom: 0.0000gd" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">D</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;一个合力偶</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><!--EndFragment-->
A:A
B:B
C:C
D:D

<p><img width="219" height="172" alt="" src="http://file.open.com.cn/ItemDB/130972/e30cd063-c42d-4d51-872d-2acd54cb23d7/2014122923461193.jpg" /></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245)" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">立方体的各边和作用在该物体上各力的方向如图所示，各力的大小分别是：<font face="Helvetica Neue">F1</font><font face="宋体">＝</font><font face="Helvetica Neue">100N</font><font face="宋体">，</font><font face="Helvetica Neue">F2</font><font face="宋体">＝</font><font face="Helvetica Neue">50N</font><font face="宋体">，</font><font face="Helvetica Neue">OA</font><font face="宋体">＝</font><font face="Helvetica Neue">4cm</font><font face="宋体">，</font><font face="Helvetica Neue">OB</font><font face="宋体">＝</font><font face="Helvetica Neue">5cm</font><font face="宋体">，</font><font face="Helvetica Neue">OC</font><font face="宋体">＝</font><font face="Helvetica Neue">3cm</font><font face="宋体">。图中力</font><font face="Helvetica Neue">F1</font><font face="宋体">对轴</font><font face="Helvetica Neue">x</font><font face="宋体">力矩为（&nbsp;&nbsp;）</font><font face="Helvetica Neue">N*m</font><font face="宋体">。</font></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245)" class="p0"><span></span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245)" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">A</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;3</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245)" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">B</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;-3</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245)" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">C</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;2</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p style="LINE-HEIGHT: 15pt; MARGIN-TOP: 0pt; MARGIN-BOTTOM: 22.5pt; BACKGROUND: rgb(245,245,245)" class="p0"><span style="FONT-STYLE: normal; FONT-FAMILY: '宋体'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">D</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)">&nbsp;0</span><span style="FONT-STYLE: normal; FONT-FAMILY: 'Helvetica Neue'; BACKGROUND: rgb(245,245,245); COLOR: rgb(51,51,51); FONT-SIZE: 10.5pt; FONT-WEIGHT: normal; mso-spacerun: 'yes'; mso-shading: rgb(245,245,245)"><o:p></o:p></span></p><p><!--EndFragment--></p>
A:A
B:B
C:C
D:D

<img width="578" height="338" alt="" src="http://file.open.com.cn/ItemDB/130972/d7f625af-e56b-46af-af8a-ba00459242ce/20141229124420738.png" />1
A:A
B:B
C:C
D:D

刚体的平面运动可以简化为一个平面图形在自身平面内的运动?（ ）。
A:错误
B:正确

对非自由体的运动所预加的限制条件称为约束（ ）。
A:错误
B:正确

力F作用相向O点平移时，为不改变它对刚体的作用效果，这时应该附加一个力偶，该力偶的矩等于力F对O点的矩（ ）。
A:错误
B:正确

<img width="401" height="60" alt="" src="http://file.open.com.cn/ItemDB/130972/35dbf3d3-86f5-4505-96ab-4eeea2494c4c/20141230064295.jpg" />1
A:错误
B:正确

惯性参考系是作惯性运动的参考系?（ ）。
A:错误
B:正确

平面汇交力系平衡的几何条件是力多边形自行封闭（ ）。
A:错误
B:正确

平面图形的运动可以分解为随基点的平动和绕基点的转动?（ ）。
A:错误
B:正确

<img width="565" height="352" alt="" src="http://file.open.com.cn/ItemDB/130972/8b84bf8b-cf6d-4f1d-b18d-67a84dd3dabd/201412300458245.jpg" />1
A:错误
B:正确

只有内力才能改变质心的运动?（ ）。
A:错误
B:正确

作用在刚体上的力可沿其作用线任意移动，而不改变力对刚体的作用效果?（ ）。
A:错误
B:正确

平面一般力系平衡方程的二矩式应满足的附加条件是二矩心的连线垂直于投影轴（ ）。
A:错误
B:正确

平面汇交力系平衡的解析条件是力系中各力在任一轴上的代数和为零（ ）。
A:错误
B:正确

刚体平动的运动特征是刚体内各点轨迹形状相同、每一瞬时各点的速度和加速度相同?（ ）。
A:错误
B:正确

<img width="567" height="124" alt="" src="http://file.open.com.cn/ItemDB/130972/edcba928-bfd0-4ae2-87b2-06acebdc9aee/201412300836629.jpg" />1
A:错误
B:正确

力对物体的作用效应一般分为内效应和外效应（ ）。
A:错误
B:正确

约束反力的方向总是与约束所能阻止的物体的运动趋势的方向相同（ ）。
A:错误
B:正确

点的切向加速度反映了点的速度的方向变化?（ ）。
A:错误
B:正确

基础坐标系是可以应用牛顿定理的参考系?（ ）。
A:错误
B:正确

<img width="594" height="91" alt="" src="http://file.open.com.cn/ItemDB/130972/ee98a01f-0052-44ea-a6c5-7a22ac24287f/201412300654281.jpg" />1
A:错误
B:正确

平面任意力系向其作用平面内不同两点简化，所得主矢间的关系是不能相同（ ）。
A:错误
B:正确