图示均质圆盘沿水平直线轨道作纯滚动,在盘心移动了距离s的过程中,水平常力FT的功为_______http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/fdae95a3ba1c4b74be8621add9dfd33e.png
举一反三
- 均质圆盘C质量为m，半径为r，在半径为R的圆弧形轨道上纯滚动，轮心C点速度v为常数；则在图示瞬时圆盘对C轴的动量矩大小为（ ）<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/4f2a21f5641e442aa7af905c5ad08bd6.png" /><img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/1ed8790882b54d5cb39ed37af07e4f96.png" /> A: 选项A B: 选项D C: 选项B D: 选项C
- 在均匀电场中，作一半径为R的半球面，使半球面的轴与场强E的方向平行，则通过这一半球面的电通量为 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/bf341a312be54f3c99c3472135e65b4d.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/75062c5d50c24d6684010689732915ac.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/47e2f56b1f234526a7582ca537740bcc.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/5284cd2d979041baaed0b04028cfb72b.png" />
- http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/3dbb9911719a4410be4616e915603f43.png
- http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/aa22f91e46cb454a9873d14613b2b312.png
- http://image.zhihuishu.com/zhs/onlineexam/ueditor/201805/9978de6591b04c3193dcd7431059bb4e.png