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奥鹏答案 发表于 2020-8-29 09:17:50

《大学物理(上)》地大模拟百分

《大学物理(上)》考前练兵
1.[单选题] 已知弹簧的劲度系数为1.3N/cm,振幅为2.4cm,弹簧振子系统的机械能为()
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    A.7.48×10-2J
    B.1.87×10-2J
    C.3.74×10-2J
    D.5.23×10-2J
    答:——C——
2.[单选题] 有两条长直导线各载有5A电流,分别沿X,Y轴正向流动.在(40,20,0)(cm)处的磁感应强度B是()
    A.3.5×10-6T,方向沿Z轴负方向
    B.2.5×10-6T,方向沿Z轴正方向
    C.4.5×10-6T,方向沿Z轴负方向
    D.5.5×10-6T,方向沿Z轴正方向
    答:——B——
3.[单选题] 质点以速度V=4+t2m/s做直线运动,沿质点运动直线作OX轴,并已知t=3s时质点位于X=9m处,则该质点的运动学方程为()
    A.X=2t
    B.X=4t+t2/2
    C.X=4t+t3/3-12
    D.X=4t+t3/3+12
    答:——C——
4.[单选题] 用线圈的自感系数L来表示载流线圈磁场能量的公式Wz=1/2(LI2)
    A.只适用于无限长密绕螺线管
    B.只适用于单匝圆线圈
    C.只适用于一个匝数很多,且密绕的螺线环
    D.适用于自感系数L一定的任意线圈
    答:————
5.[单选题] 已知圆环式螺线管的自感系数为L.若将该螺线管锯成两个半环式的螺线管,则两个半环螺线管的自感系数()
    A.都等于1/2L
    B.有一个大于1/2L,另一个小于1/2L
    C.都大于1/2L
    D.都小于1/2L
    答:————
6.[单选题] 真空中两平行带电平板相距为d,面积为S,且有d2??S,带电量分别为+q和-q,则两板间的相互作用力大小是()
    A.q2/4Πε0d2
    B.q2/ε0S
    C.2q2/ε0S
    D.q2/2ε0S
    答:————
7.[单选题] 一质点作简谐振动,周期为T,它由平衡位置沿X轴负方向运动到离最大负位移1/2处所需要的最短时间为()
    A.T/4
    B.T/12
    C.T/6
    D.T/8
    答:————
8.[单选题] 把一个静止质量为m0的粒子,由静止加速到v=0.6c(c为真空中光速)需作的功等于()
    A.0.18m0c2
    B.0.25m0c2
    C.0.36m0c2
    D.1.25m0c2
    答:————
9.[单选题] 两个匀质圆盘A和B的密度分别为tA和tB,若tA?tB,但两圆盘的质量和厚度相同,如两盘对通过盘心垂直于盘面轴的转动惯量各为JA和JB,则()
    A.JA?JB
    B.JA?JB
    C.JA=JB
    D.JA和JB不能确定哪个大
    答:————
10.[单选题] (1)对某观察者来说,发生在某惯性系中同一地点,同一时刻的两个事件,对于相对该惯性系作匀速直线运动的其它惯性系中的观察者来说,它们是否同时发生?(2)在某惯性系中发生于同一时刻,不同地点的两个事件,它们在其它惯性系中是否同时发生?关于上述两个问题的正确答案是:()
    A.(1)同时,(2)不同时
    B.(1)不同时,(2)同时
    C.(1)同时,(2)同时
    D.(1)不同时,(2)不同时
    答:————
11.[单选题] 一力学系统由两个质点组成,它们之间只有引力作用.若两质点所受外力的矢量和为零,则此系统()
    A.动量,机械能以及对一轴的角动量都守恒
    B.动量,机械能守恒,但角动量是否守恒不能断定
    C.动量和角动量守恒,但机械能是否守恒不能断定
    D.动量守恒,但机械能和角动量守恒与否不能断定
    答:————
12.[单选题] 关于静电场,下列说法正确的是()
    A.电场强度为零处,电势一定为零
    B.电势低处,电场强度一定小
    C.点电荷沿任意路径从A到B,若两点在同一等势面上,此过程电场力做功一定为零
    D.点电荷在电势高处电势能大
    答:————
13.[单选题] 做斜上抛运动的质点,达到最高点时,速度()
    A.为零
    B.达到最大值
    C.一定不为零
    D.无法确定
    答:————
14.[单选题] 光波从光疏媒质垂直入射到光密媒质,当它在界面反射时,其()
    A.相位不变
    B.频率增大
    C.相位突变
    D.频率减小
    答:————
15.[单选题] 动量守恒定律应用的条件是:()
    A.必须无外力
    B.与外力无关
    C.必须无外力矩
    D.某个方向上无外力
    答:————
16.[单选题] 几个不同倾角的光滑斜面,有共同的底边,顶点也在同一竖直面上.若使一物体(视为质点)从斜面上端由静止滑到下端的时间最短,则斜面的倾角应选()
    A.60°
    B.45°
    C.30°
    D.15°
    答:————
17.[单选题] 人造地球卫星,绕地球作椭圆轨道运动,地球在椭圆的一个焦点上,则卫星的()
    A.动量不守恒,动能守恒
    B.动量守恒,动能不守恒
    C.对地心的角动量守恒,动能不守恒
    D.对地心的角动量不守恒,动能守恒
    答:————
18.[单选题] 一质点在力F=5m(5-2t)(SI)的作用下,t=0时从静止开始作直线运动,式中m为质点的质量,t为时间,则当t=5s时,质点的速率为()
    A.0
    B.25m·s-1
    C.50m·s-1
    D.-50m·s-1
    答:————
19.[单选题] C1和C2两个电容器,其上分别标明200pF(电容量),500V(耐压值)和300pF,900V.把它们串连起来在两端加上1000V电压,则()
    A.C1被击穿,C2不被击穿
    B.C2被击穿,C1不被击穿
    C.两者都被击穿
    D.两者都不被击穿
    答:————
20.[单选题] 真空中有"孤立的"均匀带电球体和一均匀带电球面,如果它们的半径和所带的电荷都相等.则它们的静电能之间的关系是()
    A.球体的静电能等于球面的静电能
    B.球体的静电能大于球面的静电能
    C.球体的静电能小于球面的静电能
    D.球体内的静电能大于球面内的静电能,球体外的静电能小于球面外的静电能
    答:————
21.[单选题] 某质点作直线运动的运动学方程为x=3t-5t3+6(SI),则该质点作()
    A.匀加速直线运动,加速度沿x轴正方向
    B.匀加速直线运动,加速度沿x轴负方向
    C.变加速直线运动,加速度沿x轴正方向
    D.变加速直线运动,加速度沿x轴负方向
    答:————
22.[单选题] 无限长直圆柱体,半径为R,沿轴向均匀流有电流.设圆柱体内(ri,圆柱体外(r>R)的磁感强度为Be,则有()
    A.Bi,Be均与r成正比
    B.Bi,Be均与r成反比
    C.Bi与r成反比,Be与r成正比
    D.Bi与r成正比,Be与r成反比
    答:————
23.[单选题] 长直电流I2与圆形电流I1共面,并与其一直径相重合如图(但两者间绝缘),设长直电流不动,则圆形电流将()
    A.绕I2旋转
    B.向左运动
    C.向右运动
    D.向上运动
    答:————
24.[单选题] 如图,一导体棒ab在均匀磁场中沿金属导轨向右作匀加速运动,磁场方向垂直导轨所在平面.若导轨电阻忽略不计,并设铁芯磁导率为常数,则达到稳定后在电容器的M极板上()<img id="ODktanaTEMP20200720113618105.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODktanaTEMP20200720113618105.png?Expires=1910576178&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=iqx3wTnDH7QwX/ziC7kYe0txYnM%3D" />
    A.带有一定量的正电荷
    B.带有一定量的负电荷
    C.带有越来越多的正电荷
    D.带有越来越多的负电荷
    答:————
25.[单选题] 如图所示,闭合曲面S内有一点电荷q,P为S面上一点,在S面外A点有一点电荷q’,若将q’移至B点,则正确的是()<img id="ODrrxuhTEMP20200720113618398.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODrrxuhTEMP20200720113618398.png?Expires=1910576178&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=4KnTDUuLgfGKym3/mZzQF04dqjI%3D" />
    A.穿过S面的电通量改变,P点的电场强度不变
    B.穿过S面的电通量不变,P点的电场强度改变
    C.穿过S面的电通量和P点的电场强度都不变
    D.穿过S面的电通量和P点的电场强度都改变
    答:————
26.[单选题] 质量分别为m₁和m₂的两个小球,连接在劲度系数为k的轻弹簧两端,并置于光滑水平面上,如图.今以等值反向的水平力F₁、F₂分别同时作用在两个小球上,若把两个小球和弹簧看作一个系统,则系统在运动过程中()<img id="ODgxhdaTEMP20200720113618562.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODgxhdaTEMP20200720113618562.png?Expires=1910576178&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=OLY9OJuKZcG%2BTS0fHacj0OTK8js%3D" />
    A.动量守恒,机械能守恒
    B.动量守恒,机械能不守恒
    C.动量不守恒,机械能守恒
    D.动量不守恒,机械能不守恒
    答:————
27.[单选题] 有N个电荷均为q的点电荷,以两种方式分布在相同半径的圆周上:一种是无规则地分布,另一种是均匀分布.比较这两种情况下在过圆心O并垂直于圆平面的z轴上任一点P(如图所示)的场强与电势,则有()<img id="ODhwiddTEMP20200720113618692.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODhwiddTEMP20200720113618692.png?Expires=1910576178&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=C%2B88SAy2jAvjTxST94HAjpTcja0%3D" />
    A.场强相等,电势相等.
    B.场强不等,电势不等.
    C.场强分量Ez相等,电势相等.
    D.场强分量Ez相等,电势不等.
    答:————
28.[单选题] 如图所示,圆锥摆的摆球质量为m,速率为v,圆半径为R,当摆球在轨道上运动半周时,摆球所受合外力冲量的大小为()<img id="ODerwcjTEMP20200720113618855.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODerwcjTEMP20200720113618855.png?Expires=1910576179&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=VaIZ%2Bd3fCTfiKfMQET0cD1U5lto%3D" />
    A.2mv
    B.<img id="ODrzhrcTEMP20200720113619284.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODrzhrcTEMP20200720113619284.png?Expires=1910576179&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=CzKKgnQM8o4DWH99gBBysdx42PQ%3D" />
    C.<img id="ODoegiuTEMP20200720113619430.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODoegiuTEMP20200720113619430.png?Expires=1910576179&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=T0N%2Bk5i2hjx3adJ3TRv/imptASc%3D" />
    D.0
    答:————
29.[单选题] 一质量为m的质点,在半径为R的半球形容器中,由静止开始自边缘上的A点滑下,到达最低点B时,它对容器的正压力为N.则质点自A滑到B的过程中,摩擦力对其作的功为()<img id="ODblzjmTEMP20200720113619598.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODblzjmTEMP20200720113619598.png?Expires=1910576179&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=rYkaux2IVYmUX50rCF5KOTLr6YM%3D" />
    A.<img id="ODirbgeTEMP20200720113619782.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODirbgeTEMP20200720113619782.png?Expires=1910576179&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=fNAFvf190bMh3uW71xlhnlB4jwM%3D" />
    B.<img id="ODioisdTEMP20200720113619931.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODioisdTEMP20200720113619931.png?Expires=1910576180&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=j1zeSpYSsEG4GQwQnh8yNGnVJ%2BA%3D" />
    C.<img id="ODpqecaTEMP20200720113620108.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODpqecaTEMP20200720113620108.png?Expires=1910576180&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=O3cvfn7wXKMCZJG2YMKfYq%2BK1r4%3D" />
    D.<img id="ODwkwvsTEMP20200720113620267.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODwkwvsTEMP20200720113620267.png?Expires=1910576180&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=IBLvJsEG8EUm4h9KtSwhzErpFhw%3D" />
    答:————
30.[单选题] 一质点在平面上作一般曲线运动,其瞬时速度为<img id="ODqsouxTEMP20200720113620444.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODqsouxTEMP20200720113620444.png?Expires=1910576180&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=9rZ29jzU0wWswG%2B8ftHJN4Judwg%3D" />,瞬时速率为v,某一时间内的平均速度为<img id="ODuzqszTEMP20200720113620594.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODuzqszTEMP20200720113620594.png?Expires=1910576180&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=Sl4cz5Z8DWESU0yLBWrPMsKqoHg%3D" />,平均速率为<img id="ODxwucnTEMP20200720113620732.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODxwucnTEMP20200720113620732.png?Expires=1910576180&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=q5YSJMPpOdFPkZhG3L4PEBGtUd4%3D" />,它们之间的关系必定有:()
    A.<img id="ODhvnmnTEMP20200720113620894.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODhvnmnTEMP20200720113620894.png?Expires=1910576181&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=vO7tTsKJD%2BwXZciIX5YIe3u2bYU%3D" />
    B.<img id="ODfggacTEMP20200720113621049.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODfggacTEMP20200720113621049.png?Expires=1910576181&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=BSc%2Bk4AY9f6MXyY0EjexaZRkT0I%3D" />
    C.<img id="ODnznfxTEMP20200720113621196.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODnznfxTEMP20200720113621196.png?Expires=1910576181&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=Sgb5MlW30vbMQ1tKXMqMss7xOss%3D" />
    D.<img id="ODghbxvTEMP20200720113621360.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODghbxvTEMP20200720113621360.png?Expires=1910576181&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=lN0pAlafRtav1nXOOE39pHEc/mI%3D" />
    答:————
31.[单选题] 质量为20g的子弹,以400m/s的速率沿图示方向射入一原来静止的质量为980g的摆球中,摆线长度不可伸缩.子弹射入后开始与摆球一起运动的速率为()<img id="ODoqxuvTEMP20200720113621515.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODoqxuvTEMP20200720113621515.png?Expires=1910576181&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=47tzhxud9bTmglzNHTnA2B%2Bqjfw%3D" />
    A.2m/s
    B.4m/s
    C.7m/s
    D.8m/s
    答:————
32.[单选题] 如图所示的一细螺绕环,它由表面绝缘的导线在铁环上密绕而成,每厘米绕10匝.当导线中的电流I为2.0A时,测得铁环内的磁感应强度的大小B为1.0T,则可求得铁环的相对磁导率r为(真空磁导率r₀=4?×10^-7T·m·A^-1)()<img id="ODkyhvnTEMP20200720113621689.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODkyhvnTEMP20200720113621689.png?Expires=1910576181&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=uoMQRBxj%2BoTXae7fMEli5rMBBp4%3D" />
    A.7.96×102
    B.3.98×102
    C.1.99×102
    D.63.3
    答:————
33.[单选题] 有一劲度系数为k的轻弹簧,原长为l0,将它吊在天花板上.当它下端挂一托盘平衡时,其长度变为l1.然后在托盘中放一重物,弹簧长度变为l2,则由l1伸长至l2的过程中,弹性力所作的功为()
    A.<img id="ODmsxudTEMP20200720113621853.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODmsxudTEMP20200720113621853.png?Expires=1910576181&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=T4tnUvl%2BSCA8yaOXICvPfiUEybA%3D" />
    B.<img id="ODvzfvxTEMP20200720113622032.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODvzfvxTEMP20200720113622032.png?Expires=1910576182&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=zEBG5evwZIZpLErfm14Pt9WRzDY%3D" />
    C.<img id="ODbaobvTEMP20200720113622226.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODbaobvTEMP20200720113622226.png?Expires=1910576182&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=lagOnVUlG/QrtTPVXpk1tvel1Ug%3D" />
    D.<img id="ODdtsneTEMP20200720113622379.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODdtsneTEMP20200720113622379.png?Expires=1910576182&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=Z4PzyxNuREdD/dbcd6MToJyrI4Q%3D" />
    答:————
34.[单选题] 质量为m的一艘宇宙飞船关闭发动机返回地球时,可认为该飞船只在地球的引力场中运动.已知地球质量为M,万有引力恒量为G,则当它从距地球中心R1处下降到R2处时,飞船增加的动能应等于()
    A.<img id="ODdbgyoTEMP20200720113622526.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODdbgyoTEMP20200720113622526.png?Expires=1910576182&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=EKQAfzILXu1f7pCIVHXMTkXo8sY%3D" />
    B.<img id="ODcojfoTEMP20200720113622677.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODcojfoTEMP20200720113622677.png?Expires=1910576182&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=P5A1t%2BOSYTUn3Li5O3mZwcEr1SM%3D" />
    C.<img id="ODtoqejTEMP20200720113622830.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODtoqejTEMP20200720113622830.png?Expires=1910576183&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=GXTMF3zvDc/WdpSbCDDygfKmLXQ%3D" />
    D.<img id="ODuwrwqTEMP20200720113623101.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODuwrwqTEMP20200720113623101.png?Expires=1910576183&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=K7G2T4Lh1OVG4lQ9oFClSgdsSNI%3D" />    奥鹏东财答案点击 ap5u.com q1647861640
    E.<img id="ODgyogeTEMP20200720113623271.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODgyogeTEMP20200720113623271.png?Expires=1910576183&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=9lgFJWmIxNEf5PidYS2Px8Sjao8%3D" />
    答:————
35.[单选题] 真空中一半径为R的球面均匀带电Q,在球心O处有一电荷为q的点电荷,如图所示,设无穷远处为电势零点,则在球内离球心O距离为r的P点处的电势为()<img id="ODwwhnzTEMP20200720113623445.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODwwhnzTEMP20200720113623445.png?Expires=1910576183&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=/tQXllmKh469vl3pn7IpWaa%2BRYM%3D" />
    A.<img id="ODukwoyTEMP20200720113623614.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODukwoyTEMP20200720113623614.png?Expires=1910576183&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=OgujIut7axTPwq/pC02hzbH1te0%3D" />
    B.<img id="ODczxhqTEMP20200720113623770.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODczxhqTEMP20200720113623770.png?Expires=1910576183&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=A8Lb%2BaBshkavuVKe8lK/ty22CAQ%3D" />
    C.<img id="ODivivwTEMP20200720113623913.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODivivwTEMP20200720113623913.png?Expires=1910576184&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=SX10o9Mc0HXPxnL0xH0vPMr867s%3D" />
    D.<img id="ODhlfnqTEMP20200720113624064.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODhlfnqTEMP20200720113624064.png?Expires=1910576184&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=IUliufpQttkVLV//wieUA2zjLHI%3D" />
    答:————
36.[单选题] 图示为一具有球对称性分布的静电场的E~r关系曲线.请指出该静电场是由下列哪种带电体产生的.()<img id="ODgigzbTEMP20200720113624264.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODgigzbTEMP20200720113624264.png?Expires=1910576184&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=3WpH6fMp/ZkQ8WWl/oHcCqmMVF8%3D" />
    A.半径为R的均匀带电球面
    B.半径为R的均匀带电球体
    C.半径为R,电荷体密度??=A/r(A为常数)的非均匀带电球体
    D.半径为R,电荷体密度?=Ar(A为常数)的非均匀带电球体
    答:————
37.[单选题] A,B两木块质量分别为<img id="ODbkrqhTEMP20200720113624536.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODbkrqhTEMP20200720113624536.png?Expires=1910576184&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=vBo2dwpZ63xcAHvA/3lbq2KQcXc%3D" />和<img id="ODqvlecTEMP20200720113624678.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODqvlecTEMP20200720113624678.png?Expires=1910576184&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=XM0DWXqrJjdRIAV%2BjR%2BKXA0Ye2A%3D" />,且<img id="ODhgdixTEMP20200720113624850.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODhgdixTEMP20200720113624850.png?Expires=1910576184&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=cQfEanp41v6l2jdjaHEtTmly%2BMk%3D" />,两者用一轻弹簧连接后静止于光滑水平桌面上,如图所示,若用外力将两木块压紧使弹簧被压缩,然后将外力撤去,则此后两木块运动动能之比<img id="ODgwbtjTEMP20200720113625002.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODgwbtjTEMP20200720113625002.png?Expires=1910576185&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=qSrn8ZqQcdA/2VekG%2Bmz3AtxYYA%3D" />为()
    A.<img id="ODivcrkTEMP20200720113625166.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODivcrkTEMP20200720113625166.png?Expires=1910576185&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=QpZWJIOYmUIumhf2N4fin75SuTQ%3D" />
    B.<img id="ODcwrvdTEMP20200720113625309.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODcwrvdTEMP20200720113625309.png?Expires=1910576185&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=14bLlpWSpidWxmnYheZKNtlsGXo%3D" />
    C.<img id="ODbueyzTEMP20200720113625483.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODbueyzTEMP20200720113625483.png?Expires=1910576185&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=HH0d/bJx2NmfLNNoXE%2BDCtR2JCM%3D" />
    D.<img id="ODxcrphTEMP20200720113625638.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODxcrphTEMP20200720113625638.png?Expires=1910576185&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=mJhCsaIk5h8/m6azYkeg008XGvk%3D" />
    答:————
38.[单选题] 如图所示,A,B为两个相同的绕着轻绳的定滑轮.A滑轮挂一质量为M的物体,B滑轮受拉力F,而且F=Mg.设A,B两滑轮的角加速度分别为A和B,不计滑轮轴的摩擦,则有()<img id="ODvsdhfTEMP20200720113625792.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODvsdhfTEMP20200720113625792.png?Expires=1910576185&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=yG3Mvt41P/aW9vA5hWioMDG/x/M%3D" />
    A.A=B
    B.A>B
    C.A<B
    D.开始时A=B,以后A<B
    答:————
39.[单选题] 如图所示,一静止的均匀细棒,长为L,质量为M,可绕通过棒的端点且垂直于棒长的光滑固定轴O在水平面内转动,转动惯量为<img id="ODldvosTEMP20200720113625979.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODldvosTEMP20200720113625979.png?Expires=1910576186&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=e9X1tiIsZpm9xHdroIIdz3XbhPE%3D" />.一质量为m,速率为v的子弹在水平面内沿与棒垂直的方向射出并穿出棒的自由端,设穿过棒后子弹的速率为<img id="ODmvuefTEMP20200720113626140.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODmvuefTEMP20200720113626140.png?Expires=1910576186&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=xbpsFBJ2XH/%2BHMy6mN6R%2BnDmjAI%3D" />,则此时棒的角速度应为()<img id="ODiikufTEMP20200720113626284.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODiikufTEMP20200720113626284.png?Expires=1910576186&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=GQIbi4hEQS%2BnqBa2FBgQ4utEjRM%3D" />
    A.<img id="ODyidsjTEMP20200720113626460.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODyidsjTEMP20200720113626460.png?Expires=1910576186&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=q5wCv8n/kUVNyxQgGu5riNKxIi8%3D" />
    B.<img id="ODjtienTEMP20200720113626636.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODjtienTEMP20200720113626636.png?Expires=1910576186&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=SzL2y4JA9CgX1aKOqnQiNJPTNnU%3D" />
    C.<img id="ODjpkipTEMP20200720113626796.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODjpkipTEMP20200720113626796.png?Expires=1910576186&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=zDonBxvLja18ICqDZm361IymyGQ%3D" />
    D.<img id="ODtusjwTEMP20200720113626948.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODtusjwTEMP20200720113626948.png?Expires=1910576187&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=YTLWzp5qfum5tzuNvp7cEP/wKX4%3D" />
    答:————
40.[单选题] 水平地面上放一物体A,它与地面间的滑动摩擦系数为<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"> </span><var mathquill-command-id="4">μ</var></span>.现加一恒力<img id="ODkdnjcTEMP20200720113627097.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODkdnjcTEMP20200720113627097.png?Expires=1910576187&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=SWRC/QneZjJFS7L2HueJ/1EIHIo%3D">如图所示.欲使物体A有最大加速度,则恒力<img id="ODqvqzwTEMP20200720113627272.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODqvqzwTEMP20200720113627272.png?Expires=1910576187&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=HZspUxV0t3vy8oSp7LKGdcSvF4E%3D">与水平方向夹角<img id="ODevopsTEMP20200814094722217.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0814/ODevopsTEMP20200814094722217.png?Expires=1912729642&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=OvBmVWujLVtBB8bCrnre%2BY1MILw%3D">应满足()
    A.sin<img id="ODgqbuwTEMP20200814094745746.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0814/ODgqbuwTEMP20200814094745746.png?Expires=1912729664&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=V4CLYCs6uiRhd2WfHRYth%2BT5JBI%3D">=<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"> </span><var mathquill-command-id="4">μ</var></span>
    B.cos<img id="ODielhjTEMP20200814094801731.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0814/ODielhjTEMP20200814094801731.png?Expires=1912729680&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=g3SxdazQpF2Q1FSpgBtJFESKQ9k%3D">=<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"> </span><var mathquill-command-id="4">μ</var></span>
    C.tg<img id="ODyvzxkTEMP20200814094818178.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0814/ODyvzxkTEMP20200814094818178.png?Expires=1912729698&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=MypQw0bf3f7UQov4fvrcsSD6aXc%3D">=<span class="mathquill-rendered-math" style="font-size:20px;"><span class="textarea"> </span><var mathquill-command-id="4">μ</var></span>
    D.<span> </span>ctg<img id="ODjrhvxTEMP20200814094833150.png" src="http://itembankcdn.open.com.cn/zyglpt/OD/TEMP/2020/0814/ODjrhvxTEMP20200814094833150.png?Expires=1912729712&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=TGtkszXaUga8qt8Afr21Lpp/2sk%3D">=<span class="mathquill-rendered-math" style="font-size:20px;"><var mathquill-command-id="4">μ</var></span>
    答:————
41.[单选题] 一小珠可在半径为R竖直的圆环上无摩擦地滑动,且圆环能以其竖直直径为轴转动.当圆环以一适当的恒定角速度?转动,小珠偏离圆环转轴而且相对圆环静止时,小珠所在处圆环半径偏离竖直方向的角度为()
    A.<img id="ODuwplpTEMP20200720113627424.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODuwplpTEMP20200720113627424.png?Expires=1910576187&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=sTKaWkjERDixo2wrQhtR7zfvaN4%3D" />
    B.<img id="ODmsflrTEMP20200720113627575.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODmsflrTEMP20200720113627575.png?Expires=1910576187&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=0d5SI6%2BC3yy4/UT%2B3OmqMOXYiAM%3D" />
    C.<img id="ODpgedwTEMP20200720113627813.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODpgedwTEMP20200720113627813.png?Expires=1910576187&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=dljZIAuFocMid8wK0%2BC4YiGH8GM%3D" />
    D.需由小珠的质量m决定
    答:————
42.[单选题] 关于电场强度定义式<img id="ODjltnrTEMP20200720113627994.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODjltnrTEMP20200720113627994.png?Expires=1910576188&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=gwtobydL3%2BFAyUnY31RIj5UYZpk%3D" />,下列说法中哪个是正确的?()
    A.场强<img id="ODebhwxTEMP20200720113628160.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODebhwxTEMP20200720113628160.png?Expires=1910576188&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=qCw4hLRwhOdX/VNlRZSUJm6W5lU%3D" />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<img id="ODkixzfTEMP20200720113628337.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODkixzfTEMP20200720113628337.png?Expires=1910576188&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=OIkZQdepXHZHcBUYYMwvEmFVEGc%3D" />与q₀的比值不因q₀而变
    C.试探电荷受力<img id="ODzwxrhTEMP20200720113628522.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODzwxrhTEMP20200720113628522.png?Expires=1910576188&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=JmxC0kzfXhHCMQTA1YAVNun6Gic%3D" />的方向就是场强<img id="ODwvtcoTEMP20200720113628666.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODwvtcoTEMP20200720113628666.png?Expires=1910576188&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=nd7Fs2TEr1IKwUlozw3YmW92OGg%3D" />的方向
    D.若场中某点不放试探电荷q₀,则<img id="ODkkrboTEMP20200720113628804.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODkkrboTEMP20200720113628804.png?Expires=1910576188&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=S3DxcDV%2BmzH/f9I0Cnq79v2MM1I%3D" />=0,从而<img id="ODjemasTEMP20200720113628941.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODjemasTEMP20200720113628941.png?Expires=1910576189&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=3NsIE9mWM8rChZ3mMpH1VP9pcNg%3D" />=0
    答:————
43.[单选题] 质量均为m,相距为r1的两个电子,由静止开始在电力作用下(忽略重力作用)运动至相距为r2,此时每一个电子的速率为()
    A.<img id="ODefyyzTEMP20200720113629087.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODefyyzTEMP20200720113629087.png?Expires=1910576189&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=sXT/6QZMPNMpzhaIcBxvh4xQhnY%3D" />
    B.<img id="ODhbnhdTEMP20200720113629238.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODhbnhdTEMP20200720113629238.png?Expires=1910576189&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=1KREciwvVe6za9ZvTFyb71%2B5Rrk%3D" />
    C.<img id="ODrgiryTEMP20200720113629550.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODrgiryTEMP20200720113629550.png?Expires=1910576189&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=8xp/3Xq0%2Bv8PgN6p7OPw83O87PE%3D" />
    D.<img id="ODjshjeTEMP20200720113629723.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODjshjeTEMP20200720113629723.png?Expires=1910576189&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=a/VnsH7ZMkrgIdLCouy8yM7T%2BIg%3D" />[式中k=1/(4??₀)]
    答:————
44.[单选题] 一铜条置于均匀磁场中,铜条中电子流的方向如图所示.试问下述哪一种情况将会发生?()<img id="ODybxdkTEMP20200720113629965.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODybxdkTEMP20200720113629965.png?Expires=1910576190&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=zOl7Jaz1iwO6nn4Y1qnTK6UTozE%3D" />
    A.在铜条上a,b两点产生一小电势差,且Ua>Ub.
    B.在铜条上a,b两点产生一小电势差,且Uab.
    C.在铜条上产生涡流.
    D.电子受到洛伦兹力而减速.
    答:————
45.[单选题] 如图所示,两个同心的均匀带电球面,内球面半径为R₁、带电荷Q₁,外球面半径为R₂、带有电荷Q₂。设无穷远处为电势零点,则在内球面之内、距离球心为r处的P点的电势U为:() <img id="ODekmmbTEMP20200720113630113.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODekmmbTEMP20200720113630113.png?Expires=1910576190&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=LFnAKmaEJmc6oMXglW4lQNzxNtg%3D" />
    A.<img id="ODtumkdTEMP20200720113630266.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODtumkdTEMP20200720113630266.png?Expires=1910576190&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=x8935tbG/XdnXIXSObgJbaT%2B52c%3D" />
    B.<img id="ODworgxTEMP20200720113630456.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODworgxTEMP20200720113630456.png?Expires=1910576190&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=VBA70jAoc/DjTGTcyzBEd%2BwJiwI%3D" />
    C.0
    D.<img id="ODsodlfTEMP20200720113630752.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODsodlfTEMP20200720113630752.png?Expires=1910576190&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=LhZOZJzZ20y3P%2B2qhLR9CE9bd4k%3D" />
    答:————
46.[问答题] 计算:滑轮和绳子间没有滑动且绳子不可以伸长,轴与轮间有阻力矩,求滑轮两边绳子中的张力.已知m₁=20kg,m₂=10kg.滑轮质量为m₃=5kg,滑轮半径为r=0.2m,滑轮可视为均匀圆盘,阻力矩M_f=6.6N·m,已知圆盘对过其中心且与盘面垂直的轴的转动惯量为<img id="ODmlgrjTEMP20200720113630909.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODmlgrjTEMP20200720113630909.png?Expires=1910576191&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=KE8D3qNaKY8He4%2BjFs/wKqjzZVs%3D" />.<img id="ODzhzosTEMP20200720113631071.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODzhzosTEMP20200720113631071.png?Expires=1910576191&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=/GKJJ6sJZZSjRMP3m7WcTymvHl4%3D" />
    答:————
47.[问答题] 计算:如图所示,三个"无限长"的同轴导体圆柱面A,B和C,半径分别为R_a,R_b,R_c,圆柱面B上带电荷,A和C都接地.求B的内表面上电荷线密度?₁和外表面上电荷线密度?₂之比值?₁/?₂.<img id="ODyczgvTEMP20200720113632082.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODyczgvTEMP20200720113632082.png?Expires=1910576192&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=BTq43Tc9KsQrhXJ/Idm%2BGqT9BiY%3D" />
    答:————
48.[问答题] 计算:如图所示,一半径为R的均匀带电无限长直圆筒,电荷面密度为<img id="ODnpogzTEMP20200720113632728.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODnpogzTEMP20200720113632728.png?Expires=1910576192&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=EG1men7inD4i7zHMQ8D%2BD3bOeuI%3D" />,该筒以角速度<img id="ODyvfnnTEMP20200720113632890.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODyvfnnTEMP20200720113632890.png?Expires=1910576193&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=Y3BPcZBrdPzA3DRFacdHfmezego%3D" />绕其轴线匀速旋转,试求圆筒内部的磁感应强度.<img id="ODwofdlTEMP20200720113633037.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODwofdlTEMP20200720113633037.png?Expires=1910576193&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=owMxju4UphX88JAsldq9f/5AJ7Q%3D" />
    答:————
49.[问答题] 计算:如右图所示,长直导线中通有电流,<img id="ODpmfwcTEMP20200720113634393.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODpmfwcTEMP20200720113634393.png?Expires=1910576194&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=GDlavZ2aSSnJP2DZV%2B6BYKPM9mE%3D" />另一矩形线圈共<img id="ODjbzzgTEMP20200720113634547.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODjbzzgTEMP20200720113634547.png?Expires=1910576194&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=ijD2NM6nQ03j9BXn33ik3chQx8w%3D" />匝,宽<img id="ODuxbzzTEMP20200720113634697.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODuxbzzTEMP20200720113634697.png?Expires=1910576194&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=Kwq1RH6Pa6LDwmVVRepewzxUHuw%3D" />,长<img id="ODnhgjcTEMP20200720113634873.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODnhgjcTEMP20200720113634873.png?Expires=1910576195&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=rjrXvEcrnPV/mTsMLVbQCDjZuK8%3D" />,以<img id="ODswfjlTEMP20200720113635050.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODswfjlTEMP20200720113635050.png?Expires=1910576195&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=%2B62M094u7%2BFuSCZ5/lhm5OHvtCU%3D" />的速度向右平动,求当<img id="ODzsccbTEMP20200720113635249.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODzsccbTEMP20200720113635249.png?Expires=1910576195&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=/VV5VW/mRIoiptdWctd7VfLz/xs%3D" />时线圈中的感应电动势.<img id="ODslpyfTEMP20200720113635410.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODslpyfTEMP20200720113635410.png?Expires=1910576195&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=eq7fqmRrAeqV/U16epVyHvHK/24%3D" />
    答:————
50.[问答题] 计算:如图所示,传送带以3m/s的速率水平向右运动,砂子从高h=0.8m处落到传送带上,即随之一起运动.求传送带给砂子的作用力的方向.<img id="ODoasmbTEMP20200720113636308.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODoasmbTEMP20200720113636308.png?Expires=1910576196&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=wKtmLlMKpCrYe0Gti2QnLX5yv0o%3D" />
    答:————
51.[问答题] 计算:有一门质量为M(含炮弹)的大炮,在一斜面上无摩擦地由静止开始下滑.当滑下l距离时,从炮内沿水平方向射出一发质量为m的炮弹.欲使炮车在发射炮弹后的瞬时停止滑动,炮弹的初速v(对地)应是多少?(设斜面倾角为?).<img id="ODhqlghTEMP20200720113638547.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODhqlghTEMP20200720113638547.png?Expires=1910576198&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=Bvzkf4IdCUVIhwzDSwkUHGFiHOA%3D" />
    答:————
52.[问答题] 计算:一长直导线载有电流I,在它的旁边有一段直导线AB(<img id="ODygpzuTEMP20200720113639201.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODygpzuTEMP20200720113639201.png?Expires=1910576199&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=UTpn6D64umUGfFkIY2U1%2BzEhOWs%3D" />),长直载流导线与直导线在同一平面内,夹角为?.直导线AB以速度<img id="ODodqgbTEMP20200720113639361.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODodqgbTEMP20200720113639361.png?Expires=1910576199&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=6ehyQZctynD1xELViDEEo73vIbo%3D" />(<img id="ODjkvbfTEMP20200720113639534.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODjkvbfTEMP20200720113639534.png?Expires=1910576199&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=%2BBg9fU%2B8q9FknH%2BB6zI6I5gJCcY%3D" />的方向垂直于载流导线)运动.已知:I=100A,v=5.0m/s,a=2cm,<img id="ODicwiuTEMP20200720113639764.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODicwiuTEMP20200720113639764.png?Expires=1910576199&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=XMwpayLrMMCdiMjwH%2BxmrCOxUag%3D" />16cm,求:<br>(1)在图示位置AB导线中的感应电动势1.<br>(2)A和B哪端电势高.<img id="ODiehtvTEMP20200720113639920.png" src="http://aseancdn.open.com.cn/zyglpt/OD/TEMP/2020/0720/ODiehtvTEMP20200720113639920.png?Expires=1910576200&OSSAccessKeyId=gbI8DRLk7JJhLbEw&Signature=Zv58U60PugVWXNtvwJub5T7EtRI%3D" />
    答:————

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