西工大17秋《理论力学》在线作业（100分资料）

同学情

(单选题) 1: <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)">动点<font face="Helvetica Neue">M</font><font face="宋体">沿其轨迹运动，速度不等于零，若<img width="81" height="19" alt="" src="http://file.open.com.cn/ItemDB/130972/dc8d0818-252d-4fd3-a89c-0a2d7e381c09/20141229164638416.jpg" /></font></span><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)">，点<font face="Helvetica Neue">M</font><font face="宋体">作&nbsp;&nbsp;（&nbsp;&nbsp;&nbsp;）运动。</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;匀速直线</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)">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;变速直线</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)">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;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)">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;往复</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

正确资料: B


(单选题) 2: <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

正确资料: A


(单选题) 3: 跳伞者质量为60 kg，自停留在高空中的直升飞机中跳出，落下100 m后，将降落伞打开。设开伞前的空气阻力略去不计，伞重不计，开伞后所受的阻力不变，经5 s后跳伞者的速度减为4.3 m/s。阻力的大小为（ ）N。
A: 1000
B: 1068
C: 1050
D: 1100

正确资料: B


(单选题) 4: <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)">在图中，如果物块重<font face="Helvetica Neue">G=40N</font><font face="宋体">，力</font><font face="Helvetica Neue">P=20N</font><font face="宋体">，物块与地面之间的摩擦因数</font><font face="Helvetica Neue">f&nbsp;=&nbsp;0.2</font><font face="宋体">，则其摩擦力的大小等于（&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="137" height="121" alt="" src="http://file.open.com.cn/ItemDB/130972/3c7544f7-ba33-4882-885a-2856d7f891c3/20141229163036738.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;11.46N</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;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 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;10N</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;20N</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

正确资料: C


(单选题) 5: <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)">重<font face="Helvetica Neue">W</font><font face="宋体">的物块放在倾角为&alpha;的斜面上&nbsp;，已知物体与斜面之间的摩擦系角&phi;＜&alpha;，则该物块</font><font face="Helvetica Neue">(&nbsp;&nbsp;)</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); 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="173" height="100" alt="" src="http://file.open.com.cn/ItemDB/130972/b68e20ca-b38d-4e6c-a3c3-98f2df9b5287/20141229162858735.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;静止</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;处于临界平衡状态</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;滑动</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;平衡否与其重量有关</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

正确资料: C


(单选题) 6: <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

正确资料: B


(单选题) 7: 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

正确资料: B


(单选题) 8: 求平面图形上点的速度的方法不包括（）。
A: 基点法
B: 投影法
C: 瞬心法
D: 平面坐标法

正确资料: D

13546167196

抄的资料都满分，会不会老师怀疑

liujianchao

谋学网不错！

3793

资料不错哦，希望一直有这么好

钧钧

资料不错哦，希望一直有这么好

twisty2

OK，资料不错