西南大学21春0159《普通物理选讲》在线作业满分
0159 普通物理选讲1.[单选题] 关于高斯定理，以下说法正确的是（）
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A.高斯定理是普遍适用的，但用它计算电场强度时要求电荷分布具有某种对称性
B.高斯定理对非对称性的电场是不正确的
C.高斯定理一定可以用于计算电荷分布具有对称性的电场的电场强度
D.高斯定理一定不可以用于计算非对称性电荷分布的电场的电场强度
2.[单选题] 一均匀带电球面，电荷面密度为σ，球面内电场强度处处为零，球面上面元dS的一个电量为σdS的电荷元在球面内各点产生的电场强度（）
A.处处为零
B.不一定都为零
C.处处不为零
D.无法判定
3.[单选题] 已知水星的半径是地球半径的0.4倍，质量为地球的0.04倍，设在地球上的重力加速度为g，则水星表面上的重力加速度为（）
A.0.1g
B.0.25g
C.4 g
D.2.5g
4.[单选题] 关于电场强度定义式<img width="126" height="50" title="201706091497012196991017593.png" style="width: 54px; height: 21px;" alt="K~03YG`F7WIA[SZMR76AEAC.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201706091497012196991017593.png"/>，下列说法中哪个是正确的（）
A.场强E的大小与试探电荷q0的大小成反比
B.对场中某点，试探电荷受力f与q0的比值不因q0而变；
C.试探电荷受力f的方向就是场强E的方向；
D.若场中某点不放试探电荷q0，则f = 0，从而E = 0
5.[单选题] 一质点作直线运动,某时刻的瞬时速度为v=3m/s，瞬时加速度为a= －3m/s2，则一秒钟后质点的速度（）
A.等于零
B.不能确定
C.等于3m/s
D.等于－3m/s
6.[单选题] 一质量为60kg的人站在一质量为60kg、半径为lm的匀质圆盘的边缘，圆盘可绕与盘面相垂直的中心竖直轴无摩擦地转动。系统原来是静止的，后来人沿圆盘边缘走动，当人相对圆盘的走动速度为2m/s时，圆盘角速度大小为（）
A.2rad/s
B.2/3rad/s
C.4/3rad/s
D.1rad/s
7.[判断题] 牛顿运动定律只能适用于质点。
A.正确
B.错误
8.[判断题] 达到静电平衡时，导体内表面不可能有净电荷。
A.正确
B.错误
9.[判断题] 力做功与路径必定有关。
A.正确
B.错误
10.[判断题] 动生电动势和感生电动势在本质上是一样的。
A.正确
B.错误
11.[判断题] 和电场一样，磁介质被磁化而产生的磁场会削弱原磁场。
A.正确
B.错误
12.[判断题] 在等势面上，电场强度的值不一定相等
A.正确
B.错误
13.[判断题] 质点系的一对内力不能改变质心的运动状态
A.正确
B.错误
14.[判断题] 在任意电场中，沿电场线方向，场强一定越来越小
A.正确
B.错误
15.[判断题] 作曲线运动的物体必有法向加速度
A.正确
B.错误
16.[判断题] 电流密度和电流强度都是标量。
A.正确
B.错误
17.[判断题] 高斯面上的电场强度是高斯面内的电荷激发的。
A.正确
B.错误
18.[判断题] 电荷与电荷之间的作用是一种超距作用。
A.正确
B.错误
19.[判断题] 宏观低速物体的力学规律在任何参考系中形式都相同。
A.正确
B.错误
20.[判断题] 电场强度等于电势梯度的负值。
A.正确
B.错误
21.[判断题] 法向加速度反映速度大小的变化。
A.正确
B.错误
22.[判断题] 瞬时速度就是很短时间内的平均速度。
A.正确
B.错误
23.[判断题] 在求解静电场的场强时可以用到静电场的环路定理。
A.正确
B.错误
24.[判断题] 同一物体的转动惯量可以不同。
A.正确
B.错误
25.[主观填空题] 电介质中某处的电位移矢量为<img width="18" height="22" src="data:image/png;base64,R0lGODlhFgAbAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABAAPABQAhAAAAAAAAB0AAAAAHQAAMwAcSAAzWh1GbDMAADNbgEgcAFozAFtISEhuf11/f2xGHX9uSH9/XWaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwVEICCO5EKeQqCuQ3O+cCzPdG2vayEHJDLAi1aP8FLoSjwULDl6/F4BQ+94Yoqso4U1CEMQRwgqCYu9nhRP0URVxa0SpxAAOw==" v:shapes="_x0000_i1025"/>,电场强度为<img width="16" height="22" src="data:image/png;base64,R0lGODlhFAAbAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABAAOABQAhAAAAAAAAB0AAAAAHQAAMwAcSAAzWh1GbDIAHTMAADIAMjNbgEgcAFozAFozHVtISEhuf11/f2xGHW5GRn9ZSH9uSH9/XWaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwU6ICCOY0OOlRCs7HC+cCzPdC2zeLC8wYm8kgGExijUBDVJT6S4sQwxJC1YYxCOMAepoTsloKJcbgcIAQA7" v:shapes="_x0000_i1026"/>,则该处的电场能量密度为<u> </u><u>。</u>
A.
26.[主观填空题] 一人站在转动的转台上，在他伸出的两手中各握有一个重物，若此人向着胸部缩回他的双手及重物，忽略所有摩擦，则系统的角动量保持<u> </u>，系统的转动动能<u> </u>。（填增大、减小或保持不变）
A.
27.[主观填空题] 质点沿半径为<img width="18" height="18" src="data:image/png;base64,R0lGODlhFgAWAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABgAOAA0AhAAAAAAAAAAAHR0AAAAAMwAcSAAzWh1GbDMAADNbgEgcAFozAEhuf11/f2xGHX9/XX9uSGaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwVAICACSGCewqgCpgEoQbrCwWgea0nY9drastHCJBr2VKXT0RdwEVcAI0DyzMVEpeBoECjwEiraiBrYiZRl7CkRAgA7" v:shapes="_x0000_i1025"/>的圆周按规律<img width="114" height="24" src="data:image/png;base64,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" v:shapes="_x0000_i1026"/>运动，其中<img width="14" height="18" src="data:image/png;base64,R0lGODlhEQAXAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABQAKAA0AhAAAAAAAAB0AAAAAHQAcSAAzWh1IWx1GbDMAADNbgEgcAFozAEZGM0huf2xGHW5bNX9uSH9/XWaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwU0ICCKwWgKwWCOTkCsolLCgDAwwSy2KpCaOlRChOjVZhPX6AdY6GQF4qABSPaSr5rxmMuKQgA7" v:shapes="_x0000_i1027"/>、<img width="12" height="14" src="data:image/png;base64,R0lGODlhDwASAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABAAKAAkAhAAAAAAAAB0AAAAAHQAAMwAcSAAzWh1GbDIAMjMeRzNbgEgcAFozAEhuf11/f2xGHX9uSH9/XWaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwUjICCKQTmKwiAuhQilY3AGxjkKgWKTxM6fiZtMhDhNSoHeKAQAOw==" v:shapes="_x0000_i1028"/>为常数，则在切向加速度和法向加速度相等以前所经历的时间为<u> </u>。
A.
28.[主观填空题] 单位长度内有<img width="14" height="14" src="data:image/png;base64,R0lGODlhEQASAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABAAKAAkAhAAAAAAAAB0AAB0AHQAAHQAAMwAcSAAzWh0zWh1JSR1GbDMAADMeRzNbgEgcAFozAFtINUhuf11/f2xGHX9uSG5uRH9/XW6AbmaIiIBbM4iIZgECAwECAwECAwECAwECAwUtIPAEAWAKQWMCg2kAzrG+CEAJiukkzEqsgsLKsQKUgDlYEfA7FR0GiEm4WhxDADs=" v:shapes="_x0000_i1025"/>匝线圈的无限长通电螺线管，电流为<img width="14" height="18" src="data:image/png;base64,R0lGODlhEQAWAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABgAKAA0AhAAAAAAAAB0AAAAAHQAAMwAcSAAzWh1GbDMAADNbgEgcAFozAF1/f0huf2xGHX9uSH9/XWaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwUlICCKQRkc4ygU6fgISTsSsqjUooADdH3XL1RtgEPsTjJToCcKAQA7" v:shapes="_x0000_i1026"/>，则其内一点的磁感应强度为<u> </u><u> </u><u> </u>。
A.
29.[主观填空题] 有两个相同的弹簧，其倔强系数均为<em style="mso-bidi-font-style: normal;">k</em>，把它们串联起来，下面挂一个质量为<em style="mso-bidi-font-style: normal;">m</em>的重物，此系统作简谐振动的周期为<u> </u>。
A.
30.[主观填空题] 甲船以v1=10m/s的速度向南航行，乙船以v2=10m/s的速度向东航行，则甲船上的人观察乙船的速度大小为<u> </u>，向<u> </u>航行。
A.
31.[主观填空题] 无限长均匀带电直线，单位长度上的电荷即电荷的线密度为<img width="14" height="18" src="data:image/png;base64,R0lGODlhEgAXAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABAANAA4AhAAAAAAAAAAAHR0AAAAAMwAcSAAzWh0zWh1GbDMAADIAMjMeRzMzWzNGbjNbgEgcAFozAEczHlszM0YzRkhuf11/f2xGHX9/XX9uSGaIiIBbM4iIZgECAwECAwECAwECAwUwICCOQCCQqDYiaOu6zTtCsmgFTj2cclIAlNeDAJDIeLLAaOFStlSiAUohYpaaREAIADs=" v:shapes="_x0000_i1025"/>，则距离直线为<img width="12" height="14" src="data:image/png;base64,R0lGODlhDwARAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABQAJAAkAhAAAAAAAAB0dAB0AAAAAMwAcSAAzWh1GbDMAADQ0NDNbgEgcAEgdHVozAFozHVl/bkhuf11/f2xGHX9/XX9uSGaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwUfILAEAWAWpkkAjJCaBgC9AJIotBXENLD2i55pIPQJQwA7" v:shapes="_x0000_i1026"/>处的电场强度为<u> </u><u></u> 。
A.
32.[主观填空题] 匀质圆盘状飞轮，质量为20kg，半径为30cm，当它以每分钟60转的速率旋转时，其动能为<u> </u>。
A.
33.[主观填空题] 一质点沿半径为0.2m的圆周运动, 其角位置随时间的变化规律是<img width="121" height="33" title="201706121497215693461048086.png" style="width: 82px; height: 19px;" alt="F`W1WFG5W]ATE8O}(}7OQX3.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201706121497215693461048086.png"/>（SI制）。在t=2s时，它的法向加速度an=<u> </u>；切向加速度at=<u> </u>。
A.
34.[主观填空题] 产生机械波的必要条件是<u> </u>和<u> </u>。
A.
35.[主观填空题] 一飞轮作匀减速运动，在5s内角速度由40πrad/s减到10πrad/s，则飞轮在这5s内总共转过了<u> </u>圈，飞轮再经<u> </u>的时间才能停止转动 。
A.
36.[主观填空题] 把物体受到总是与其相对位置的 成正比，方向相反的 力作用下的运动叫做简谐振动。
A.
37.[主观填空题] 在研究电磁感应现象时，麦克斯韦提出了两条假设： <u> </u> ， <u></u><u> </u><u> </u>。
A.
38.[主观填空题] 做半径为R的匀速圆周运动的质点, 角速度为ω，其切向加速度为<u> </u>, 法向加速度为 <span style="text-decoration: underline;"> </span>。
A.
39.[主观填空题] 有两个相同的弹簧，其倔强系数均为<em style="mso-bidi-font-style: normal;">k，</em>把它们并联起来，下面挂一质量为<em style="mso-bidi-font-style: normal;">m</em>的重物，此系统作简谐振动的周期为<u> </u>。
A.
40.[主观填空题] 质量为m的质点，在变力Ｆ=F0 (1－kt)（F0和k均为常量）作用下沿ox轴作直线运动。若已知t=0时，质点处于坐标原点，速度为v0。则质点运动微分方程为<u> </u>，质点速度随时间变化规律为v=<u> </u>。
A.
41.[主观填空题] 一质点沿<img width="14" height="14" src="data:image/png;base64,R0lGODlhEgASAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABAANAAkAhAAAAAAAAB0AAAAAHQAAMwAzWgA0SB1JSR1GbDMAADMeRzNbgEgcAF1/f0huf2xGHX9uSH9/XWaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwUoICCKwQgIhCkEwSCuqQmwhywnQWyLT76brJ/IMNuxCiSXCYcYMYKiEAA7" v:shapes="_x0000_i1025"/>轴运动，其运动方程为<img width="104" height="22" src="data:image/png;base64,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" v:shapes="_x0000_i1026"/>，其中<img width="14" height="14" src="data:image/png;base64,R0lGODlhEgASAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABAANAAkAhAAAAAAAAB0AAAAAHQAAMwAzWgA0SB1JSR1GbDMAADMeRzNbgEgcAF1/f0huf2xGHX9uSH9/XWaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwUoICCKwQgIhCkEwSCuqQmwhywnQWyLT76brJ/IMNuxCiSXCYcYMYKiEAA7" v:shapes="_x0000_i1027"/>以米计算。则该质点的初速度为<u> </u>，加速度为<u> </u>。
A.
42.[主观填空题] 一根匀质细杆质量为m、长度为l，可绕过其端点的水平轴在竖直平面内转动。则它在水平位置时所受的重力矩为<u> </u>。
A.
43.[主观填空题] 设作用在质量为1 kg的物体上的力F＝6t＋3（SI）。如果物体在这一力的作用下，由静止开始沿直线运动，则到t =1.0 s时此力对物体的冲量大小Ｉ＝<u> </u>。
A.
44.[主观填空题] 一驻波的表达式为<img width="166" height="42" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/>，两个相邻的波腹之间的距离为<u> </u>。
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45.[主观填空题] 若两个同方向不同频率的谐振动的表达式分别为<img width="98" height="22" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/>和<img width="102" height="22" src="data:image/png;base64,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" v:shapes="_x0000_i1026"/>，则它们的合振动频率为<u> </u>，每秒的拍数为<u> </u>。
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46.[主观填空题] 一弹簧振子作简谐振动，其振动曲线如图所示。则它的周期<em style="mso-bidi-font-style: normal;">T</em>=<u> </u>，其余弦函数描述时初相位<img width="14" height="18" src="data:image/png;base64,R0lGODlhEgAWAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIABAANAA4AhAAAAAAAAAAAHR0AAAAAMwAcSB0dSAAzWh1GbDMAADIAHTNbgEgcAEgdHVozAEhuf11/f2xGHX9/XX9uSG6AbmaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwVCICCKjABEQXCMgKW2Y8AGiNiMyQokxWjgsVFktgA4BI9RUkQgNUU/0WB0TA5JLECgN5pmtanA82skZxVLM4CrdqhDADs=" v:shapes="_x0000_i1026"/>=<u> </u>。
<img width="348" height="216" title="201706121497229946579001504.png" style="width: 191px; height: 102px;" alt="3Z(P`667HL[@BN~O[D$1(MD.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201706121497229946579001504.png"/>
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47.[主观填空题] 洛仑兹力的方向总是垂直于带电粒子的运动方向, 由动能定理知, 洛仑兹力作功为<u> </u>.
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48.[主观填空题] 1819年，<u> </u>发现了电流的磁效应，1831年，<u> </u>发现了电磁感应现象。 东师大学q7 612 960 21 更多答案进 ap5u.com
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49.[问答题] <img width="769" height="131" title="201706151497489122898000452.png" style="width: 587px; height: 100px;" alt="D2I][[97S5@@TYBWK0[5UV7.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201706151497489122898000452.png"/>
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50.[问答题] <img width="845" height="236" title="201706151497496367325004981.png" style="width: 696px; height: 192px;" alt="(DREL1B6L24%E4LB}5YKR)X.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201706151497496367325004981.png"/>
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51.[问答题] <img width="696" height="168" title="201706151497501701303001716.png" style="width: 634px; height: 144px;" alt="U%D]S`K3NQ]A6Q7X@VQT@{3.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201706151497501701303001716.png"/>
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52.[问答题] <img width="916" height="219" title="201706151497495540041088689.png" style="width: 700px; height: 174px;" alt="PHNEGM.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201706151497495540041088689.png"/>
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53.[问答题]
<img width="521" height="154" title="201706151497493282750044860.png" alt="@{[)C_1W}0Z}NPD}8XI8EOC.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201706151497493282750044860.png" style="width: 521px; height: 154px;"/>
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54.[问答题] 卡车沿一平直轨道以恒定的加速度a运动。为了测量此加速度，从卡车的天花板上悬挂一质量为m的均匀细长杆，若细长杆与铅直方向的夹角为θ，求加速度α与θ间的关系。
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55.[问答题] <img width="703" height="162" title="201706151497495949614076577.png" style="width: 566px; height: 142px;" alt="3HTQ{ZVU$FL@{OX(7SW$8)A.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201706151497495949614076577.png"/>
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56.[问答题] <img width="860" height="253" title="201706151497495332588011230.png" style="width: 611px; height: 172px;" alt="GVPR2$7Y_[(`USI[IRDOMP7.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201706151497495332588011230.png"/>
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57.[问答题] 当火车静止时，乘客发现雨滴下落方向偏向车头，偏角为30°，当火车以35 m/s的速率沿水平直路行驶时，发现雨滴下落方向偏向车尾，偏角为45°，假设雨滴相对于地的速度保持不变，试计算雨滴相对地的速度大小。
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58.[问答题] <img width="786" height="81" title="201706151497500371992004720.png" style="width: 653px; height: 62px;" alt="HD%0VTDL0_N~HYK5}UOPHEP.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201706151497500371992004720.png"/>
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59.[问答题] <img width="550" height="126" title="201706151497489432114001550.png" style="width: 400px; height: 88px;" alt="$O6Y0]L8RAPHK[U8{N(16YP.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201706151497489432114001550.png"/>
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60.[问答题] <img width="773" height="370" title="201706151497501915220026591.png" style="width: 589px; height: 254px;" alt="FQ]6~)]K31A[{SPX%W{`L~P.png" src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs/201706151497501915220026591.png"/>
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